CN102810181A - RFID tag with gas sensitive device, RFID system and gas concentration detecting method - Google Patents
RFID tag with gas sensitive device, RFID system and gas concentration detecting method Download PDFInfo
- Publication number
- CN102810181A CN102810181A CN2012101836083A CN201210183608A CN102810181A CN 102810181 A CN102810181 A CN 102810181A CN 2012101836083 A CN2012101836083 A CN 2012101836083A CN 201210183608 A CN201210183608 A CN 201210183608A CN 102810181 A CN102810181 A CN 102810181A
- Authority
- CN
- China
- Prior art keywords
- sensitive devices
- antenna
- gas sensitive
- gas
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides an RFID (Radio Frequency Identification) tag with a gas sensitive device, an RFID system and a gas concentration detecting method. The gas sensitive device and an antenna of the RFID tag are in a parallel structure, and a connection circuit of the gas sensitive device and a chip of the RFID tag is provided with an on-off controlling logic circuit and a voltage-resistance conversion device, when the logic circuit is switched off, the gas sensitive device is not connected with the antenna in parallel and is arranged in a certain gaseous environment, and the first resonant frequency and the signal strength of the antenna keep unchanged; when the logic circuit is switched on, the gas sensitive device is connected with the antenna in parallel and is arranged in a certain gaseous environment, at least one of the characteristic frequency and the signal strength of the antenna is changed, and at this time the antenna works under a second resonant frequency; and an instruction sent by an RFID reader is received by the RFID tag to control the on-off of the logic circuit so as to detect the change of gas concentration through comparing the difference between strengths of signals with different frequencies from the antenna. The change of the gas concentration can be detected at a lower cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular to a kind of RFID label, rfid system with gas sensitive devices.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.In general, this system comprises a RFID reader at least, and this RFID reader can transmit and receive the radiofrequency signal from one or more RFID labels in the scope of a setting.This RFID label generally encapsulates, and can be attached on the object, and it comprises the microchip that an ability and antenna carry out information interchange.This microchip is an integrated circuit in general, and it can be used for storing and process information, the modulation radiofrequency signal, and can move other specific function.The antenna of RFID label is to be used for receiving and sending radiofrequency signal, and is applicable to a kind of special frequency usually.
In some equipment, when the gas concentration that the rfid system that has gas sensitive devices has been used to monitor product environment of living in has surpassed the acceptable gas concentration.In general these equipment requirements induction installations will have a lasting energy source, are used for the change of detected gas concentration, but this can increase the cost of equipment.In addition, some equipment requirements induction installations also will link to each other with a comparator circuit, thereby detect the degree size that departs from reference voltage, and this requirement has increased the cost of equipment greatly.In a word, improve rfid system and be necessary, its requires when not using lasting energy source or use a kind of adjunct circuit cheaply, can be used for the detected gas change in concentration.
Summary of the invention
The embodiment of the invention provides a kind of RFID label, rfid system with gas sensitive devices, comes the detected gas change in concentration at lower cost.
On the one hand, the embodiment of the invention provides a kind of RFID label with gas sensitive devices, and two pins are arranged on the chip of said RFID label; Two pins of said gas sensitive devices and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of ambient atmos environment can cause gas sensitive devices voltage or change in current; Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on said gas sensitive devices and circuit that the chip of RFID label is connected, and the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, and voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance; The break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off; Gas sensitive devices not with the sky line parallel, this moment be placed under certain gaseous environment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gaseous environment with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected gas concentration.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said gas sensitive devices and the voltage that links to each other with this gas sensitive devices-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps said gas sensitive devices forms parallel-connection structure simultaneously with the voltage that links to each other with this gas sensitive devices-resistance conversion equipment and two antennas.
Optional; In an embodiment of the present invention; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen.
On the other hand, the embodiment of the invention provides a kind of RFID label with gas sensitive devices, and a pin is arranged on the chip of said RFID label; One end of said gas sensitive devices links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The variation of ambient atmos environment can cause gas sensitive devices voltage or change in current; Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on said gas sensitive devices and circuit that the chip of RFID label is connected, and the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, and voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance; The break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off; Gas sensitive devices not with the sky line parallel, this moment be placed under certain gaseous environment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gaseous environment with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected gas concentration.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said gas sensitive devices and the voltage that links to each other with this gas sensitive devices-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps said gas sensitive devices forms parallel-connection structure simultaneously with the voltage that links to each other with this gas sensitive devices-resistance conversion equipment and two antennas.
Optional; In an embodiment of the present invention; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen.
Another aspect; The embodiment of the invention provides a kind of RFID label with gas sensitive devices; Said gas sensitive devices is connected on the antenna of said RFID label; And forming parallel-connection structure with antenna, the variation of ambient atmos environment can cause gas sensitive devices voltage or change in current, on said gas sensitive devices and circuit that antenna is connected, a logical circuit and a voltage-resistance conversion equipment of controlling break-make is arranged; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance, the break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off, gas sensitive devices not with the sky line parallel; Be placed under certain gaseous environment this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gaseous environment with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected gas concentration.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a monopole antenna.
Optional, in an embodiment of the present invention, the antenna of said RFID label is a double-doublet antenna: said gas sensitive devices and the voltage that links to each other with this gas sensitive devices-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps said gas sensitive devices forms parallel-connection structure simultaneously with the voltage that links to each other with this gas sensitive devices-resistance conversion equipment and two antennas.
Optional; In an embodiment of the present invention; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen.
Another aspect, the embodiment of the invention provide a kind of rfid system with gas sensitive devices, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises the RFID label of above-mentioned band gas sensitive devices; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of detected gas concentration from the difference between the signal intensity of the different frequency of antenna through comparison.
Again on the one hand; The embodiment of the invention provides a kind of gas concentration detection method of the rfid system with gas sensitive devices; Said gas concentration detection method is applied to the rfid system of above-mentioned band gas sensitive devices, comprising: send the break-make of instruction with the logical circuit of control RFID label through said RFID reader; Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Gas sensitive devices not with the sky line parallel; Be placed on this moment under certain gaseous environment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gaseous environment with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Utilize the comparison of said RFID reader to come the change of detected gas concentration from the difference between the signal intensity of the different frequency of antenna.
Technique scheme has following beneficial effect: because adopt a kind of RFID label with gas sensitive devices; The antenna of said gas sensitive devices and said RFID label forms parallel-connection structure; The variation of ambient atmos environment can cause gas sensitive devices voltage or change in current; Logical circuit and a voltage-resistance conversion equipment that a control break-make is arranged on said gas sensitive devices and circuit that the chip of RFID label is connected; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance, the break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off, gas sensitive devices not with the sky line parallel; Be placed under certain gaseous environment this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gaseous environment with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit; Thereby realize coming from the difference between the signal intensity of the different frequency of antenna the technological means of the change of detected gas concentration through comparison; Can come the technique effect of detected gas change in concentration at lower cost so reached; And the energy that utilizes RFID to obtain, solved the powerup issue that gas concentration detects.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The synoptic diagram that Fig. 1 is connected with the RFID label chip for embodiment of the invention gas sensitive devices;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
Fig. 3 is the synoptic diagram that embodiment of the invention gas sensitive devices, logic switch and voltage-resistance conversion equipment is connected with RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 4 directly is connected for embodiment of the invention gas sensitive devices and RFID label antenna;
Fig. 5 is the structure key diagram of embodiment of the invention gas sensitive devices;
Fig. 6 is the process flow diagram of the embodiment of the invention based on the gas concentration detection method of signal intensity.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The gas sensitive devices of the embodiment of the invention links to each other with the chip of RFID label and has three kinds of situation at least:
The two pins structure:
The present invention is a kind of device, system and technology that is used for the detected gas change in concentration.This system has comprised a label, and two pins are arranged on the chip of this label.Two pins of gas sensitive devices and this link to each other, and form parallel-connection structure with antenna.The variation of ambient atmos concentration can cause gas sensitive devices voltage or change in current.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.The break-make of logical circuit determined gas sensitive devices whether with the sky line parallel.When logical circuit breaks off, gas sensitive devices not with the sky line parallel.This moment, gas sensitive devices was placed under certain gas concentration, and first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, gas sensitive devices was placed under certain gas concentration with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.Reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can come the change of detected gas concentration through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a label, has only an antenna (monopole antenna) on this label.Two pins are arranged on the chip of this label.Two pins of gas sensitive devices and this link to each other, and form parallel-connection structure with antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.Gas sensitive devices is placed under certain gas concentration when logical circuit is connected, and antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.Reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency during through the comparison logic break-make can detected gas concentration.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
With regard to another instance, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Two kinds of situation are arranged this moment.First kind of situation is that two pins of gas sensitive devices and this link to each other, and forms parallel-connection structure with first antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.This moment voltage-resistance conversion equipment of linking to each other with gas sensitive devices also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.When logical circuit is connected, be placed under certain gas concentration, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under second resonant frequency.Reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency of first and second antennas can detected gas concentration when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through second antenna self relatively also can detected gas concentration change.Second kind of situation is that two pins of gas sensitive devices and this link to each other, and form parallel-connection structure simultaneously with two antennas.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.Voltage-resistance conversion equipment that link to each other with gas sensitive devices this moment is also simultaneously parallelly connected with these two antennas, and the situation that this and label only contain an antenna is similar.When logical circuit is connected, be placed under certain gas concentration, antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.Reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency during through the comparison logic break-make can detected gas concentration.First kind of situation circuit connection is fairly simple, and the resonant frequency of two antennas maybe be different during work, can influence the precision of measurement.Second kind of situation circuit connects more complicated, but the resonant frequency of two antennas is consistent during work, and measuring accuracy is higher.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
One pin configuration:
The chip of this label can only have a pin, and this pin outwards links to each other with an end of gas sensitive devices, and the other end of gas sensitive devices is directly linked on the antenna.Pin is similar in the situation of the tie point of chip internal and two pins, finally remains the purpose that will reach with day line parallel.Simultaneously on pin and circuit that the chip internal circuit is connected, a logical circuit of controlling break-make is arranged.In addition, on the circuit of antenna again the parallel connection a voltage-resistance conversion equipment, voltage-resistance conversion equipment has circuit to be connected with the two-termial line of gas sensitive devices and logical circuit again.When logical circuit breaks off, gas sensitive devices not with the sky line parallel, this moment be placed under certain gas concentration, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, gas sensitive devices was placed under certain gas concentration with a day line parallel, this moment, and antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.Reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can come the change of detected gas concentration through comparison from the difference between the signal intensity of the different frequency of antenna.
With regard to an instance, this system has comprised a label, has only an antenna (monopole antenna) on this label.Gas sensitive devices links to each other with this pin, and the other end of gas sensitive devices is directly linked on the antenna, forms parallel-connection structure with this root antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.When logical circuit is connected, be placed under certain gas concentration, antenna features frequency and signal intensity have one at least and change, and it is operated under second resonant frequency.Reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency during through the comparison logic break-make can detected gas concentration.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
With regard to another instance, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Gas sensitive devices with this one by one pin link to each other, the other end of gas sensitive devices is directly linked on the antenna, forms parallel-connection structure with first antenna.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on pin and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.This moment voltage-resistance conversion equipment of linking to each other with gas sensitive devices also with first sky line parallel, and second antenna is all the time with the first resonant frequency proper communication.When logical circuit is connected, be placed under certain gas concentration, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change.Reader can send instruction to label, and when connecting through comparison logic, the change that the difference between the signal intensity of the different frequency of first and second antennas can detected gas concentration.Difference between the signal intensity of the different frequency during logical circuit break-make through first antenna self relatively also can detected gas concentration change.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
No pin configuration:
When not having pin on the chip of RFID label, gas sensitive devices can directly be linked on the antenna.Gas sensitive devices and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.In this case, the antenna that links to each other with gas sensitive devices can not break away from gas sensitive devices and communicate by letter with first resonant frequency.When being placed under certain gas concentration, second resonant frequency of antenna and signal intensity have one at least and change.Reader can send instruction to label apparatus, comes the change of detected gas concentration from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to an instance, this system has comprised a label, and two antennas (double-doublet antenna) are arranged on this label.Gas sensitive devices directly links to each other with first antenna.Gas sensitive devices and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.And second antenna do not link to each other with gas sensitive devices all the time with the first resonant frequency proper communication.When being placed under certain gas concentration, first antenna features frequency and signal intensity have at least a meeting to change, and it is operated under second resonant frequency, and the characteristic frequency of second antenna and signal intensity are constant.Reader can send instruction to label, and the change that the difference between the signal intensity of the different frequency through first and second antennas of comparison can detected gas concentration.Or rather, voltage-resistance conversion equipment can be an equivalent electrical circuit that variable voltage is converted to variable-resistance device, ditch type FET or FET.And the instantiation of gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
In the same way, can be with on the chip of antenna also and can not be with pin, can be with one also can be with a plurality of pins.The radical of antenna can be one, two or even many.Also can connect one or more gas sensitive deviceses accordingly, the model of gas sensitive devices can be the same or different simultaneously.In addition, the voltage that is attached thereto-resistance conversion equipment also can have many variations.With regard to the device a kind of instantiation with regard to, when be placed on certain gas concentration under, the resonant frequency of the antenna that links to each other with gas sensitive devices and signal intensity have at least a meeting to change.Reader can send instruction to label apparatus, comes the change of detected gas concentration from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of instantiation of gas sensitive devices, the method for simultaneous comparison numerical value comprises that these are compared numerical value compares with most signal strength values.These signal strength values belong to different frequencies, and interrelate with the gas concentration of majority, simultaneously based on the above-mentioned comparison of mentioning can detected gas concentration intensity.
Yet with regard to another aspect, a rfid system comprises a RFID label apparatus and a RFID reader device.This RFID label apparatus is used to send two kinds of signals, the signal when signal when promptly above-mentioned logical circuit breaks off and logical circuit are connected, and these two kinds of signals have at least a kind of meeting that the request that receives is responded.The RFID reader device is used for the RFID label apparatus is sent a request at least.Reading device is installed is the fiducial value between the signal strength values in order to receive signal strength values and logical circuit when connecting and to break off, and be converted into the varying level of gas concentration to these fiducial values from the logical circuit of label.
In an example, the antenna of RFID label links to each other with gas sensitive devices, and the logical circuit of a control break-make is arranged on this connection line.Gas sensitive devices and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.Under logical circuit break-make whether two kinds of situation, this antenna has two kinds of corresponding with it different frequencies, i.e. first resonant frequency and second resonant frequency.Connect and be positioned over this label apparatus under certain gas concentration when logical circuit,, will produce the intensity level of unlike signal owing to the variation of resonant frequency.
In an example, the RFID label apparatus comprises first, second two antennas, and wherein first antenna launched first signal, and second antenna emission secondary signal.Better situation is; First antenna links to each other with voltage-resistance conversion equipment with gas sensitive devices; When this label apparatus is placed under certain gas concentration, because the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal strength values.
As shown in Figure 1, the synoptic diagram of the gas sensing label 10 that is connected with the RFID label chip for embodiment of the invention gas sensitive devices.As shown in Figure 1, label apparatus 10 comprises 13, two pins 16,17 of 15, one surface-mounted integrated circuits of a base and a double-doublet antenna 11,12.Two pins 16,17 are arranged on the surface-mounted integrated circuit 13, and these two pins outwards link to each other with gas sensitive devices 14, and these two pins are parallelly connected with the equivalent electrical circuit of antenna at chip internal, and the logical circuit of a control break-make is arranged on the circuit that connects.Gas sensitive devices and antenna form parallel-connection structure.Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on antenna and circuit that chip is connected, and the logical circuit and the voltage-resistance conversion equipment of the circuit of this connection, control break-make are the parts of chip.The effect of voltage-resistance conversion equipment is to convert gas sensitive devices voltage or change in current to changes in resistance.Whether gas sensitive devices can be controlled by in the access chip circuit through the break-make of logical circuit, thereby the frequency of the antenna that links to each other with radio-frequency module can be influenced.When logical circuit broke off, label antenna was with the first resonant frequency communication.When logical circuit is connected, be placed under certain gas concentration, antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.
In an example, transmitting terminal antenna 11,12 is processed by one or more different low electrical resistant materials, and these materials have higher electric conductivity; Copper for example, silver, and aluminium; They link to each other with antenna 11,12 through two pins 16,17 with the above-mentioned gas sensitive devices of mentioning; When antenna 11,12 is placed under certain gas concentration, gas sensitive devices can cause the variation of one or more transmitting terminal generation resonant frequencies.The frequency of the frequency of this variation and reception and transmission is all different.For example, when logical circuit was connected, gas sensitive devices was positioned under certain gas concentration, will cause sending that at least one changes in frequency and the receive frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the certain gas concentration environment, and when reaching certain gas concentration, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the certain gas concentration, and it will rise when reaching certain gas concentration.Can be used for such gas sensitive devices of the present invention has: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
Type based on gas sensitive devices is different, and the gas concentration that causes changing possibly be that a specific gas concentration value also possibly be a scope of gas concentration value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the gas sensitive devices that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 2, be the equivalent circuit diagram of RFID label antenna.In the alternating magnetic field that tag coil antenna entering read write line produces, the interaction between label antenna and the reading and writing device antenna just is similar to transformer.Both coils are equivalent to the primary coil and the secondary coil of transformer.Resonant tank by label antenna forms is as shown in Figure 2; The coil inductance (L), stray capacitance (Cp) and the shunt capacitance (C2) that comprise label antenna; Its resonance frequency is the parallelly connected equivalent capacity of Cp and C2 for C in
formula; R1, R2 are the equivalent resistance of circuit internal inductance coil and other devices.The carrier frequency that label and read write line two-way communication are used is exactly f.The tag antenna coil profile is very little when requiring; Be that area is little; And need certain operating distance, the aerial coil mutual induction amount that RFID label and read write line are asked just obviously can not practical requirement, can have the Ferrite Material of high permeability in the inner insertion of tag antenna coil; With the increase mutual induction amount, thus the little problem of compensating coil xsect.
As shown in Figure 3, be embodiment of the invention gas sensitive devices, the logical circuit of control break-make and the synoptic diagram that voltage-resistance conversion equipment is connected with RFID label antenna equivalent electrical circuit.Resonant tank by label antenna forms is as shown in the figure; The coil inductance (L), stray capacitance (Cp) and the shunt capacitance (C2) that comprise label antenna; Its resonance frequency is the parallelly connected equivalent capacity of Cp and C2 for
formula C; R1, R2 are the equivalent resistance of circuit internal inductance coil and other devices.M is the variable resistor of representative gas sensitive devices, and S is the logical circuit of control break-make, and R3 is the equivalent resistance of connecting with gas sensitive devices, and F is voltage-resistance conversion equipment.When logical circuit breaks off, gas sensitive devices not with the sky line parallel, this moment be placed under certain gas concentration, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, gas sensitive devices was placed under certain gas concentration with a day line parallel, this moment, and antenna features frequency and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.
Synoptic diagram as shown in Figure 4, as directly to link to each other for embodiment of the invention gas sensitive devices and RFID label antenna, the i.e. sketch of the passive RFID tags device 40 of detectable gas change in concentration.As shown in Figure 4, label apparatus 40 comprises 45, one integrated circuit 43 of a base and a double-doublet antenna 41,42.The gas sensitive devices 44 that links to each other with antenna 42 will influence the resistance of antenna 42.The material that gas sensitive devices 44 is suitable for can be controlled the frequency that any one had both been fixed a point according to any one current voltage in the antenna 41,42.With regard to an instance, fixing up an aerial wire 41,42 can make it produce resonance in identical frequency.With regard to another instance, fixing up an aerial wire 41,42 can make it produce resonance in different frequency.
In an example, transmitting terminal antenna 41,42 is processed by one or more different low electrical resistant materials; These materials have higher electric conductivity, copper for example, silver; And aluminium, they link to each other with the above-mentioned gas sensitive devices of mentioning, when antenna 41; 42 are placed under certain gas concentration, and gas sensitive devices can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby cause a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, gas sensitive devices is positioned under certain gas concentration, will cause sending that at least one changes in frequency and the receive frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under the certain gas concentration environment, and when reaching certain gas concentration, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under the certain gas concentration, and it will rise when reaching certain gas concentration.Can be used for such gas sensitive devices of the present invention has: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen etc.
Type based on gas sensitive devices is different, and the gas concentration that causes changing possibly be that a specific gas concentration value also possibly be a scope of gas concentration value selectively.The length of time must cause the variation of antenna resonance frequency, and antenna quality also can cause different variations.The type of the gas sensitive devices that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 5, be the structural drawing of Pd-MIS gas sensing diode.It is on P type or N type silicon substrate 51, to generate one deck SiO2 layer 52, on the SiO2 layer, forms 300～200 ° of Pd films 53 that A is thick with evaporation or sputtering technology then, forms the Pd-MIS gas sensing diode.If be placed on this diode in the tested gas, the electric capacity of gas sensing diode and voltage characteristic will change.Because the difference of gas concentration also can make semi-conductive flat-band voltage Vfb that translation takes place, according to this specific character, it can be used for the measurement of hydrogen, carbon monoxide and butane gas.
As shown in Figure 6, come a kind of method flow diagram of detected gas concentration change through the label apparatus that uses many antennas for the present invention.What need consider is, the above-mentioned device of mentioning uses a label integrated circuit to carry out and the exchanging of a plurality of antennas.
As shown in Figure 6,50, the RFID reader sends energy and instruction to label apparatus.52, logical circuit is in the state of disconnection at initial time, and label apparatus is with the antenna received energy and the instruction that do not link to each other with gas sensitive devices.54, label apparatus is converted into DC (direct current) voltage to the electromagnetic wave that carries energy, thereby just can make label carry out the requirement of indication.And this conversion need be used a charge pump, and a rectification circuit perhaps interconnects it, perhaps will use other energy conversion device.56, label apparatus sends signal through the sky alignment reader that does not link to each other with gas sensitive devices.58, the energy intensity of receiving signal is measured and write down to reader.60, reader sends the instruction of connecting logical circuit to label apparatus.62, label apparatus is used the antenna transmission data that link to each other with gas sensitive devices.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reflected signal intensity.68, reader changes into different gas concentrations with fiducial value.With regard to an instance, reader can be set the signal that a time period is used for receiving label, if do not receive signal, reader will be recorded as 0 with signal intensity.
In this system, reader will compare its signal strength values with the label antenna that links to each other with gas sensitive devices from the signal strength values of the antenna that does not link to each other with gas sensitive devices as a reference value.Through receive from the signal that links to each other with gas sensitive devices with the transmitting terminal that does not link to each other with gas sensitive devices, reader can be collected the fiducial value of representing unlike signal intensity.Then, the RFID reader can be converted into the residing gas concentration of label to such fiducial value.With regard to a concrete instance, disposing this RFID reader is to be converted into gas concentration value for the difference from the RF signal intensity that connects the antenna that does not perhaps connect gas sensitive devices that will receive through the reference data of using storage.
Best situation is, with the antenna that does not connect gas sensitive devices as a reference, can be with owing to the variation that coupling caused between label and the reader filters out.In addition, as before mention, gas sensitive devices is applied to the time length that variation and the label of the resistance value that can make it in the design be placed under the specific gas concentration and forms relation one to one.For example; Gas sensitive devices is only positioned on an antenna; Can allow like this to change within the specific limits as a kind of function from the signal of RFID label apparatus, and this function just antenna be placed on the function that just has after the time under the certain gas concentration.The same, the application of the invention, under the passive condition of RFID label, the RFID reader can detect label apparatus whether be placed under certain gas concentration and this gas concentration whether within the acceptable range.
Do not use the various RFID labels of two antennas also can perceive the variation of gas concentration with gas sensitive devices, the variation that the variation of perception gas concentration is based on resonant frequency on the antenna also can recognize the variation that antenna receives signal.
For example pass through design to the antenna that links to each other with gas sensitive devices; The frequency that can make antenna is at ISM (Industrial Scientific Medical; Industry, science, medical science) the interior variation of frequency range, can connect this antenna that links to each other with gas sensitive devices and logical circuit on the label of standard.
For example label antenna can so be set in a concrete instance; Before in being exposed to the certain gas concentration environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in the certain gas concentration environment, because the influence of gas concentration; The resonant frequency of antenna is just reduced to 899.5-927.5MHZ; Frequency frequency range (902-928MHZ) at U.S. RFID is split into 52 channels, and reader can be skipped the channel that can not receive at random in these 52 channels, and the benefit of this jump of reader is exactly can a plurality of readers of effectively preventing in same physical space, to attempt the conflict of using same frequency to cause.
For example in an example, RFID frequency range (902-928MHZ) is not to be divided into 52 channels but the antenna settings that on average has been divided into n channel tag is carried out work under this frequency range (902-928MHZ).Because label antenna links to each other with gas sensitive devices, so as long as gas concentration has surpassed the scope of predefined value, the frequency of operation of antenna tag antenna just drops among (899.5-927.5MHZ) this frequency range.Therefore compare just channel n to be got rid of from band limits with original frequency range and go, the frequency range (899.5-927.5MHZ) after therefore changing is carried out exchanging of information with regard to no longer allowing label with channel n.
In concrete instance; If the environment at label place has surpassed the gas concentration scope of expection; Reader can only send instruction to label through channel 1 to n-1, and label also can be made a response, because the antenna in the label just can only be worked in this frequency range; When reader with the frequency of n channel when label sends instruction; Because the variation of tag gas bulk concentration has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, just no longer make a response so no longer reach the 928MHZ label, pass information back reader.
Favourable aspect is because gas concentration has exceeded the variation of the operating frequency of antenna that predefined value causes, is just reflected by the disappearance of this information interchange.
In model; Reader can send an instruction between channel n-1 and channel n to label and further check that drift has taken place the operating frequency range of label antenna; Because label can receive the instruction that sends through channel n-1; And can be to the reader feedback information through channel n-1; Because label can not receive the instruction that sends through channel n, and can not can so just confirm that drift has taken place the operating frequency range of label antenna to the reader feedback information through channel n.
The variation of gas concentration causes the frequency of operation of label antenna to take place upwards to be not limited in downward drift and the present invention frequency range on average is divided into n channel.
The embodiment of the invention can be come the detected gas change in concentration at lower cost, and the energy that utilizes RFID to obtain, and has solved the powerup issue that gas concentration detects.
The enforcement of each characteristics of this system may relate to software; The combination that hardware also possibly relate to software and hardware just can reach, and for example the enforcement of many advantages of system is to realize with the mutual mode that exchanges of computer and other equipment machines with object oriented programming languages with a kind of high-caliber processing through programming.Each such function program for example possibly be stored in the storage intermediary in the ROM (read-only memory) to be read by a computer and processor and realize above-mentioned function.
Those skilled in the art can also recognize the various illustrative components, blocks (illustrative logical block) that the embodiment of the invention is listed, and unit and step can be passed through electronic hardware, computer software, or both combinations realize.Be the clear replaceability (interchangeability) of showing hardware and software, above-mentioned various illustrative components (illustrative components), unit and step have been described their function generally.Such function is to realize depending on the designing requirement of certain applications and total system through hardware or software.Those skilled in the art can be for every kind of certain applications, and can make ins all sorts of ways realizes described function, but this realization should not be understood that to exceed the scope of embodiment of the invention protection.
Various illustrative logical block described in the embodiment of the invention; Or the unit can pass through general processor, digital signal processor, special IC (ASIC); Field programmable gate array (FPGA) or other programmable logic device; Discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can realize through the combination of calculation element, for example digital signal processor and microprocessor, a plurality of microprocessors, Digital Signal Processor Core of one or more microprocessors associatings, or any other similarly configuration realize.
The method described in the embodiment of the invention or the step of algorithm can directly embed hardware, the software module of processor execution or the two combination.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, so that processor can read information from storage medium, and can deposit write information to storage medium.Alternatively, storage medium can also be integrated in the processor.Processor and storage medium can be arranged among the ASIC, and ASIC can be arranged in the user terminal.Alternatively, processor and storage medium also can be arranged in the various parts in the user terminal.
In one or more exemplary designs, the described above-mentioned functions of the embodiment of the invention can realize in hardware, software, firmware or this three's combination in any.If in software, realize, these functions can be stored on the media with computer-readable, or are transmitted on the media of computer-readable with one or more instructions or code form.The computer-readable media comprises that the computer storage medium lets computer program transfer to other local telecommunication media from a place with being convenient to make.Storage medium can be the useable medium that any general or special computer can access.For example; Such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other any can be used to carry or store with instruction or data structure and other can be read the media of the program code of form by general or special computer or general or special processor.In addition; Any connection can suitably be defined as the computer-readable media; For example, if software is through a concentric cable, optical fiber computer, twisted-pair feeder, Digital Subscriber Line (DSL) or also being comprised in the defined computer-readable media with wireless mode transmission such as for example infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with the magnetic duplication data, and video disc carries out the optical reproduction data with laser usually.Above-mentioned combination also can be included in the computer-readable media.
Above-described embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. the RFID label with gas sensitive devices is characterized in that, two pins are arranged on the chip of said RFID label; Two pins of said gas sensitive devices and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of ambient atmos concentration can cause gas sensitive devices voltage or change in current; Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on said gas sensitive devices and circuit that the chip of RFID label is connected, and the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, and voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance; The break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off; Gas sensitive devices not with the sky line parallel, this moment be placed under certain gas concentration, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gas concentration with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected gas concentration.
2. according to claim 1 with the RFID label of gas sensitive devices, it is characterized in that the antenna of said RFID label is a monopole antenna.
3. according to claim 1 with the RFID label of gas sensitive devices, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said gas sensitive devices and the voltage that links to each other with this gas sensitive devices-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps said gas sensitive devices forms parallel-connection structure simultaneously with the voltage that links to each other with this gas sensitive devices-resistance conversion equipment and two antennas.
4. according to claim 1 with the RFID label of gas sensitive devices; It is characterized in that; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen.
5. the RFID label with gas sensitive devices is characterized in that, a pin is arranged on the chip of said RFID label; One end of said gas sensitive devices links to each other with this pin; The other end is connected on the antenna of said RFID label; And form parallel-connection structure with antenna; The variation of ambient atmos concentration can cause gas sensitive devices voltage or change in current; Logical circuit and a voltage-resistance conversion equipment of a control break-make are arranged on said gas sensitive devices and circuit that the chip of RFID label is connected, and the circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip, and voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance; The break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off; Gas sensitive devices not with the sky line parallel, this moment be placed under certain gas concentration, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gas concentration with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected gas concentration.
6. like the RFID label of the said band gas sensitive devices of claim 5, it is characterized in that the antenna of said RFID label is a monopole antenna.
7. like the RFID label of the said band gas sensitive devices of claim 5, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said gas sensitive devices and the voltage that links to each other with this gas sensitive devices-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps said gas sensitive devices forms parallel-connection structure simultaneously with the voltage that links to each other with this gas sensitive devices-resistance conversion equipment and two antennas.
8. like the RFID label of the said band gas sensitive devices of claim 5; It is characterized in that; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen.
9. RFID label with gas sensitive devices; It is characterized in that; Said gas sensitive devices is connected on the antenna of said RFID label; And forming parallel-connection structure with antenna, the variation of ambient atmos concentration can cause gas sensitive devices voltage or change in current, on said gas sensitive devices and circuit that antenna is connected, a logical circuit and a voltage-resistance conversion equipment of controlling break-make is arranged; The circuit of this connection, this logical circuit and this voltage-resistance conversion equipment are the parts of chip; Voltage-resistance conversion equipment is used for converting gas sensitive devices voltage or change in current to changes in resistance, the break-make of logical circuit determined gas sensitive devices whether with the sky line parallel: when logical circuit breaks off, gas sensitive devices not with the sky line parallel; Be placed under certain gas concentration this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gas concentration with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency; Said RFID label receives the break-make of the instruction of RFID reader transmission with control logic circuit, thereby realizes coming from the difference between the signal intensity of the different frequency of antenna through comparison the change of detected gas concentration.
10. like the RFID label of the said band gas sensitive devices of claim 9, it is characterized in that the antenna of said RFID label is a monopole antenna.
11. the RFID label like the said band gas sensitive devices of claim 9 is characterized in that, the antenna of said RFID label is a double-doublet antenna: said gas sensitive devices and the voltage that links to each other with this gas sensitive devices-resistance conversion equipment form parallel-connection structure with antenna wherein; Perhaps said gas sensitive devices forms parallel-connection structure simultaneously with the voltage that links to each other with this gas sensitive devices-resistance conversion equipment and two antennas.
12. RFID label like the said band gas sensitive devices of claim 9; It is characterized in that; Said voltage-resistance conversion equipment comprises: a variable voltage converts the equivalent electrical circuit of variable-resistance device or a ditch type FET or FET to, and said gas sensitive devices comprises: hydrogen-sensing element, the quick metal-oxide-semiconductor field effect transistor of hydrogen, the quick integrated sensor of hydrogen, gas sensing diode, Pd-MIS gas sensing diode, Pd-TiO
2Gas sensing diode, primary element formula gas sensitive devices, the quick device of primary element formula ammonia, the quick device of primary element formula oxygen.
13. the rfid system with gas sensitive devices, said rfid system comprises RFID label and RFID reader, it is characterized in that,
Said RFID label comprises the RFID label of each said band gas sensitive devices among the claim 1-4, or the RFID label of each said band gas sensitive devices among the claim 5-8, or the RFID label of each said band gas sensitive devices among the claim 9-12;
Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby comes the change of detected gas concentration from the difference between the signal intensity of the different frequency of antenna through comparison.
14. the gas concentration detection method with the rfid system of gas sensitive devices is characterized in that, said gas concentration detection method is applied to the rfid system of the said band gas sensitive devices of claim 13, comprising:
Send the break-make of instruction through said RFID reader with the logical circuit of control RFID label;
Receive the break-make of the instruction of RFID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Gas sensitive devices not with the sky line parallel; Be placed on this moment under certain gaseous environment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, gas sensitive devices was placed under certain gaseous environment with a day line parallel, this moment, and the characteristic frequency of antenna and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency;
Utilize the comparison of said RFID reader to come the change of detected gas concentration from the difference between the signal intensity of the different frequency of antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836083A CN102810181A (en) | 2012-06-01 | 2012-06-01 | RFID tag with gas sensitive device, RFID system and gas concentration detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101836083A CN102810181A (en) | 2012-06-01 | 2012-06-01 | RFID tag with gas sensitive device, RFID system and gas concentration detecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102810181A true CN102810181A (en) | 2012-12-05 |
Family
ID=47233885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101836083A Pending CN102810181A (en) | 2012-06-01 | 2012-06-01 | RFID tag with gas sensitive device, RFID system and gas concentration detecting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102810181A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021659A (en) * | 2015-07-08 | 2015-11-04 | 中国科学院上海硅酸盐研究所 | Passive wireless gas sensor based on low temperature co-fired ceramic substrate and manufacturing method thereof |
| CN109270128A (en) * | 2018-10-19 | 2019-01-25 | 上扬无线射频科技扬州有限公司 | A kind of electronic tag formula gas sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
| CN102293643A (en) * | 2011-05-23 | 2011-12-28 | 陕西鸿远科技有限公司 | Implanted physiological data measurement device |
-
2012
- 2012-06-01 CN CN2012101836083A patent/CN102810181A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100079288A1 (en) * | 2008-09-30 | 2010-04-01 | Timothy Collins | RFID Tag Device with Temperature Sensitive Antenna |
| CN102293643A (en) * | 2011-05-23 | 2011-12-28 | 陕西鸿远科技有限公司 | Implanted physiological data measurement device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021659A (en) * | 2015-07-08 | 2015-11-04 | 中国科学院上海硅酸盐研究所 | Passive wireless gas sensor based on low temperature co-fired ceramic substrate and manufacturing method thereof |
| CN109270128A (en) * | 2018-10-19 | 2019-01-25 | 上扬无线射频科技扬州有限公司 | A kind of electronic tag formula gas sensor |
| CN109270128B (en) * | 2018-10-19 | 2021-12-10 | 上扬无线射频科技扬州有限公司 | Electronic tag type gas sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102750578A (en) | RFID (Radio Frequency Identification Devices) label with mechanical displacement detector, RFID system and mechanical displacement detection method | |
| CN102809583A (en) | RFID (Radio Frequency Identification) system of measuring gas concentration and method of measuring gas concentration of RFID system | |
| CN102722748A (en) | RFID label with photosensitive device, RFID system and illumination detection method | |
| CN102842015A (en) | RFID (radio frequency identification) system for detecting degree of closeness and method for detecting distance between objects | |
| CN102693448A (en) | RFID (Radio Frequency Identification) label with air-sensitive device, RFID system and air concentration detection method | |
| CN102722747A (en) | RFID label with thermosensitive device, RFID system and temperature detection method | |
| CN102750577A (en) | RFID (Radio Frequency Identification Devices) label with proximity sensor, RFID system and method for detecting distance between objects | |
| CN102750576A (en) | Radio frequency identification device (RFID) label with level-detecting device, RFID system with level-detecting device and level detection method | |
| CN102750572A (en) | RFID (Radio Frequency Identification Devices) label with moisture sensor, RFID system and method for detecting moisture | |
| CN102722746A (en) | RFID label with thermosensitive device, RFID system and temperature detection method | |
| CN202584180U (en) | RFID label with temperature-sensitive device and RFID system | |
| CN202736099U (en) | RFID tag with proximity sensitive device and RFID system with proximity sensitive device | |
| CN102831463A (en) | RFID (Radio Frequency Identification Device) label with mechanical displacement detection device, RFID system and mechanical displacement detection method | |
| CN102750569A (en) | Radio frequency identification device (RFID) label with photosensitive device, RFID system and illumination detection method | |
| CN202720066U (en) | RFID system for measuring temperature | |
| CN102842059A (en) | RFID (Radio Frequency Identification devices) tag with approached type sensitive device, RFID system and object distance detecting method | |
| CN102810181A (en) | RFID tag with gas sensitive device, RFID system and gas concentration detecting method | |
| CN202563540U (en) | RFID label with moisture sensing device and RFID system | |
| CN102708400A (en) | RFID (Radio Frequency Identification Device) label with magnetically susceptible device, RFID system and magnetic field detection method | |
| CN102737268A (en) | Humidity measurement radio frequency identification (RFID) system and humidity measurement method thereof | |
| CN202694396U (en) | Radio frequency identification device (RFID) label and RFID system with approaching sensitive device | |
| CN202693069U (en) | RFID system used for level measurement | |
| CN202734752U (en) | RFID system for measuring degree of proximity | |
| CN202735284U (en) | Radio frequency identification device (RFID) system for testing gas concentration | |
| CN102750571A (en) | Radio frequency identification device (RFID) label with stress sensitive device, RFID system with stress sensitive device and stress detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121205 |