CN102737268A - Humidity measurement radio frequency identification (RFID) system and humidity measurement method thereof - Google Patents

Humidity measurement radio frequency identification (RFID) system and humidity measurement method thereof Download PDF

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CN102737268A
CN102737268A CN2012101803183A CN201210180318A CN102737268A CN 102737268 A CN102737268 A CN 102737268A CN 2012101803183 A CN2012101803183 A CN 2012101803183A CN 201210180318 A CN201210180318 A CN 201210180318A CN 102737268 A CN102737268 A CN 102737268A
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rfid label
quick device
rfid
antenna
wet quick
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CN102737268B (en
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霍灵瑜
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Beijing Wuzi University
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Beijing Wuzi University
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Abstract

The invention provides a humidity measurement radio frequency identification (RFID) system and a humidity measurement method thereof. The humidity measurement RFID system consists of an RFID reader, a first RFID label and a second RFID label, wherein the first RFID label and the second RFID label are provided with same chips and antennas. The first RFID label works under a first resonant frequency after being placed under a certain humidity level for a period of time. The second RFID label is an RFID label with a humidity-sensitive device, the humidity-sensitive device and an antenna of the second RFID label form a parallel-connection structure, and at the moment, the second RFID label works under a second resonant frequency after being placed under a certain humidity level for a period of time. The first RFID label and the second RFID label respectively receives instructions transmitted by the RFID reader and feed back signals, and the RFID reader detects changes of the humidity by comparing difference between signal strength of different frequencies from the first RFID label and the second RFID label. The humidity measurement RFID system can detect the humidity changes with low cost.

Description

The method of a kind of rfid system of hygrometric degree and hygrometric degree thereof
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, relate in particular to a kind of method of rfid system and hygrometric degree thereof of hygrometric degree.
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 the radiofrequency signal from one or more RFID labels can launched and accept to this RFID reader in the scope of a setting.This RFID label generally encapsulates; Can be attached on the object, it comprises the chip that an ability and antenna carry out information interchange, and this chip is a microchip; It is an integrated circuit in general; 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 humidity that a kind of rfid system of hygrometric degree has been used to monitor product environment of living in has surpassed acceptable humidity.In general these equipment requirements induction installations will have a lasting energy source, are used for detecting the change of humidity, 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 detecting humidity and changes.
Summary of the invention
The embodiment of the invention provides a kind of method of rfid system and hygrometric degree thereof of hygrometric degree, detects humidity at lower cost and changes.
On the one hand; The embodiment of the invention provides a kind of rfid system of hygrometric degree; The rfid system of said hygrometric degree comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has two pins for the RFID label of the wet quick device of band on the chip of said the 2nd RFID label; Said wet quick device links to each other with these two pins; And form parallel-connection structure with the antenna of said the 2nd RFID label; The variation of extraneous humidity can cause the wet changes in resistance of quick device own; Be placed on certain humidity after following a period of time of level this moment, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
Optional, in an embodiment of the present invention, the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure.
Optional; In an embodiment of the present invention; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
Optional, in an embodiment of the present invention, said wet quick device is the wet quick device of resistor-type, said wet quick device comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type, inorganic point are separated the wet quick device of matter formula, the wet quick device of quartz resonance.
On the other hand; The embodiment of the invention provides a kind of rfid system of hygrometric degree; The rfid system of said hygrometric degree comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has a pin for the RFID label of the wet quick device of band on the chip of said the 2nd RFID label; One end of said wet quick device 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, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own, be placed on certain humidity after following a period of time of level this moment; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
Optional, in an embodiment of the present invention, the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure.
Optional; In an embodiment of the present invention; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
Optional, in an embodiment of the present invention, said wet quick device is the wet quick device of resistor-type, the wet quick device of said resistor-type comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type, inorganic point are separated the wet quick device of matter formula, the wet quick device of quartz resonance.
Another aspect; The embodiment of the invention provides a kind of rfid system of hygrometric degree; The rfid system of said hygrometric degree comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label is the RFID label of the wet quick device of band; Said wet quick device is connected on the antenna of said RFID label; And form parallel-connection structure with antenna, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own, be placed on certain humidity after following a period of time of level this moment; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
Optional, in an embodiment of the present invention, the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure.
Optional; In an embodiment of the present invention; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
Optional, in an embodiment of the present invention, said wet quick device is the wet quick device of resistor-type, the wet quick device of said resistor-type comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type, inorganic point are separated the wet quick device of matter formula, the wet quick device of quartz resonance.
Again on the one hand; The embodiment of the invention provides a kind of method of rfid system hygrometric degree of hygrometric degree; Said method is applied to the rfid system of above-mentioned hygrometric degree; Comprise: a said RFID label is placed on certain humidity after following a period of time of level; First resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged; This moment, a said RFID label was operated under first resonant frequency: said the 2nd RFID label is placed on certain humidity after following a period of time of level, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; Send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals; Difference when utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of humidity.
Technique scheme has following beneficial effect: because adopt the rfid system of said hygrometric degree to comprise: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and a said RFID label is operated under first resonant frequency; Said the 2nd RFID label is the RFID label of the wet quick device of band; The antenna of said wet quick device and said the 2nd RFID label forms parallel-connection structure; Be placed on certain humidity after following a period of time of level this moment, and said the 2nd RFID label is operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively; Said RFID reader is through relatively detecting the technological means of the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency; So reached and detected the technique effect that humidity changes at lower cost; And the energy that utilizes RFID to obtain, solved the powerup issue of Humidity Detection.
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.
Fig. 1 is the rfid system structural representation of a kind of hygrometric degree of the embodiment of the invention;
The synoptic diagram that Fig. 2 is connected with the 2nd RFID label chip for the wet quick device of the embodiment of the invention;
Fig. 3 is the equivalent circuit diagram of the embodiment of the invention the 2nd RFID label chip inside antenna;
The synoptic diagram that Fig. 4 is connected for the wet quick device of the embodiment of the invention, the 2nd RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 5 directly is connected for wet quick device of the embodiment of the invention and RFID label antenna;
Fig. 6 .1-Fig. 6 .2 is the structure key diagram of the wet quick device of the embodiment of the invention;
Fig. 7 is the method flow diagram of the embodiment of the invention based on the hygrometric degree 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.
As shown in Figure 1; Rfid system structural representation for a kind of hygrometric degree of the embodiment of the invention; The rfid system of said hygrometric degree comprises: RFID reader 1, a RFID label 2 and the 2nd RFID label 3, and a said RFID label 2 has identical chip and antenna with said the 2nd RFID label 3; A said RFID label 2 is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label 2 remain unchanged, and this moment, a said RFID label 2 was operated under first resonant frequency; Said the 2nd RFID label 3 is the RFID label of the wet quick device of band; The antenna of said wet quick device and said the 2nd RFID label 3 forms parallel-connection structure; The variation of extraneous humidity can cause the wet changes in resistance of quick device own; Be placed on certain humidity after following a period of time of level this moment, and the characteristic frequency of the antenna of said the 2nd RFID label 3 and signal intensity have one at least and change, and this moment, said the 2nd RFID label 3 was operated under second resonant frequency; A said RFID label 2 receives instruction and the feedback signal that said RFID reader 1 sends respectively with said the 2nd RFID label 3, and said RFID reader 1 is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label 2 and said the 2nd RFID label 3 different frequencies.The wet quick device of the embodiment of the invention links to each other with the chip of the 2nd RFID label and has three kinds of situation at least:
The two pins structure:
The embodiment of the invention is a kind of rfid system that humidity changes that is used for detecting.This system has comprised two RFID labels: a RFID label and the 2nd RFID label.Two pins are arranged on the chip of the 2nd RFID label, and wet quick device links to each other with these two pins, forms parallel-connection structure with antenna, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own.Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of humidity.
With regard to an instance, this system has comprised a kind of RFID label, and said label comprises a RFID label and the 2nd RFID label, and a RFID label and the 2nd RFID label all have only an antenna.Two pins are arranged on the chip of the 2nd RFID label, and wet quick device links to each other with these two pins, forms parallel-connection structure with antenna, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own.Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of humidity.
Or rather, wet quick device should have lower resistance, and its instantiation comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type (Se (selenium) evaporating film wet quick device, silicon MOS type Al 2O 3Wet quick device), inorganic point is separated the wet quick device of matter formula (stepping on the wet quick device of Morse LiCl, the wet quick device of impregnated, DWS-P type LiCl (lithium chloride) hygristor device), the wet quick device of quartz resonance etc.
With regard to another instance, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all have two antennas.Two pins are arranged on the chip of the 2nd RFID label, and wet quick device links to each other with these two pins, forms parallel-connection structure simultaneously with two antennas.The variation of extraneous humidity can cause the wet changes in resistance of quick device own.The situation that this and the 2nd RFID label only contain an antenna is similar.Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of humidity.Or rather, wet quick device should have lower resistance, and its instantiation comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type (Se (selenium) evaporating film wet quick device, silicon MOS type Al 2O 3Wet quick device), inorganic point is separated the wet quick device of matter formula (stepping on the wet quick device of Morse LiCl, the wet quick device of impregnated, DWS-P type LiCl (lithium chloride) hygristor device), the wet quick device of quartz resonance etc.
One pin configuration:
This system has comprised two RFID labels: a RFID label and the 2nd RFID label, a pin is arranged on the chip of the 2nd RFID label, and this pin outwards links to each other with an end of wet quick device, and the other end of wet quick device 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.The variation of extraneous humidity can cause the wet changes in resistance of quick device own.Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of humidity.
With regard to an instance, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all have only an antenna.A pin is arranged on the chip of the 2nd RFID label, and wet quick device links to each other with this pin, and the wet quick device other end is directly linked on the antenna, forms parallel-connection structure with antenna.The variation of extraneous humidity can cause the wet changes in resistance of quick device own.Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, realizes communication, and the difference in the time of can be through a RFID label and the 2nd RFID label work relatively between the signal intensity of different frequency detects the change of humidity.Or rather, wet quick device should have lower resistance, and its instantiation comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type (Se (selenium) evaporating film wet quick device, silicon MOS type Al 2O 3Wet quick device), inorganic point is separated the wet quick device of matter formula (stepping on the wet quick device of Morse LiCl, the wet quick device of impregnated, DWS-P type LiCl (lithium chloride) hygristor device), the wet quick device of quartz resonance etc.
No pin configuration:
This system has comprised two RFID labels: a RFID label and the 2nd RFID label, there is not pin on the chip of the 2nd RFID label, and wet quick device is directly linked on the antenna.In this case, the antenna that links to each other with wet quick device can not break away from the quick device and with normal frequency for communication of wetting.When being placed on certain humidity after following a period of time of level, the characteristic frequency of antenna and signal intensity have one at least and change.The RFID reader can send instruction to label apparatus, realizes communication, through relatively detect the change of humidity from the difference between the signal intensity of the different frequency of a RFID label and the 2nd RFID label.
With regard to an instance, this system has comprised two RFID labels: a RFID label and the 2nd RFID label; The one RFID label and the 2nd RFID label all have only an antenna.Do not have pin on the chip of the 2nd RFID label, wet quick device is directly linked on the antenna.The variation of extraneous humidity can cause the wet changes in resistance of quick device own.Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of the antenna of a RFID label remain unchanged.The characteristic frequency of the antenna of the 2nd RFID label and signal intensity have one at least and change, and this moment, antenna was operated under second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through relatively a RFID label and second label work can detect the change of humidity.Or rather, wet quick device should have lower resistance, and its instantiation comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type (Se (selenium) evaporating film wet quick device, silicon MOS type Al 2O 3Wet quick device), inorganic point is separated the wet quick device of matter formula (stepping on the wet quick device of Morse LiCl, the wet quick device of impregnated, DWS-P type LiCl (lithium chloride) hygristor device), the wet quick device of quartz resonance 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 wet quick devices accordingly, the model of wet quick device can be the same or different simultaneously.With regard to a kind of instantiation of device, when being placed on certain humidity after following a period of time of level, the characteristic frequency and the signal intensity of the antenna that links to each other with wet quick device have at least a meeting to change.The RFID reader can send instruction to label apparatus, detects the change of humidity from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of instantiation of wet quick device, 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 humidity value of majority, can detect the level of humidity simultaneously based on the above-mentioned comparison of mentioning.
Yet with regard to another aspect, a rfid system comprises two RFID label apparatus and a RFID reader device.These two RFID label apparatus are used to send two kinds of signals; Promptly; The signal of the signal of the one RFID label and the 2nd RFID label; Reader is received the signal of a RFID label and the signal of the 2nd RFID label respectively, through the fiducial value between the signal strength values of RFID label of background process and the 2nd RFID label, and is converted into these fiducial values the varying level of humidity.
As shown in Figure 2, the wet synoptic diagram of label 10 of the sense that is connected with the 2nd RFID label chip for the wet quick device of the embodiment of the invention.Among Fig. 2, 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 wet quick device 14, and these two pins are parallelly connected with the equivalent electrical circuit of antenna at chip internal.This label can communicate with reader.
In an example, transmitting terminal 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 pass through two pins 16 with the above-mentioned wet quick device of mentioning; 17 is continuous with antenna 11,12, when antenna 11; 12 are placed on certain humidity after following a period of time of level, and wet quick device can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby causes a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, wet quick device is positioned over certain humidity after following a period of time of level, will cause transmission frequency and accept that at least one changes in the frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under certain humidity environment, and when reaching certain humidity, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under certain humidity level, and it will rise when reaching the certain humidity level.Can be used for so wet quick device of the present invention has: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type (Se (selenium) evaporating film wet quick device, silicon MOS type Al 2O 3Wet quick device), inorganic point is separated the wet quick device of matter formula (stepping on the wet quick device of Morse LiCl, the wet quick device of impregnated, DWS-P type LiCl (lithium chloride) hygristor device), the wet quick device of quartz resonance etc.
Type based on wet quick device is different, and causing the humidity level who changes possibly be that a specific humidity value also possibly be a scope of humidity 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 wet quick device that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
As shown in Figure 3, be the equivalent circuit diagram of a 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 the figure, comprises coil inductance (L), the stray capacitance (C of label antenna p) and shunt capacitance (C 2), its resonance frequency does
Figure BDA00001717212000091
C is C in the formula pAnd C 2Parallelly connected equivalent capacity, R 1, R 2Equivalent resistance for 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 4, be the wet quick device of the embodiment of the invention, the synoptic diagram that is connected with the 2nd RFID label antenna equivalent electrical circuit.Resonant tank by label antenna forms is as shown in the figure, comprises coil inductance (L), the stray capacitance (C of label antenna p) and shunt capacitance (C 2), its resonance frequency does
Figure BDA00001717212000092
Formula C is C pAnd C 2Parallelly connected equivalent capacity, R 1, R 2Equivalent resistance for circuit internal inductance coil and other devices.M is the variable resistor of the wet quick device of representative.This label is placed on certain humidity after following a period of time of level, and antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.
As shown in Figure 5, can detect the sketch of the passive RFID tags device 40 that humidity changes for the embodiment of the invention.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 wet quick device 44 that links to each other with antenna 42 will influence the resistance of antenna 42.The material that wet quick device 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 double- doublet 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 wet quick device of mentioning, when antenna 41; 42 are placed on certain humidity after following a period of time of level, and wet quick device can cause the variation of one or more transmitting terminal generation resonant frequencies, thereby causes a different frequency.The frequency of the variation of this frequency and reception and transmission is all different.For example, wet quick device is positioned over certain humidity after following a period of time of level, will cause transmission frequency and accept that at least one changes in the frequency.
In another example, the antenna frequencies value of setting at the beginning will be higher than the antenna frequencies under certain humidity environment, and when reaching certain humidity, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under certain humidity level, and it will rise when reaching the certain humidity level.The so wet quick device that can be used for this invention has: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type (Se (selenium) evaporating film wet quick device, silicon MOS type Al 2O 3Wet quick device), inorganic point is separated the wet quick device of matter formula (stepping on the wet quick device of Morse LiCl, the wet quick device of impregnated, DWS-P type LiCl (lithium chloride) hygristor device), the wet quick device of quartz resonance etc.
Type based on wet quick device is different, and causing the humidity level who changes possibly be that a specific humidity value also possibly be a scope of humidity 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 wet quick device that for example, has on the antenna can influence the length that changes the antenna resonance frequency required time.
Shown in Fig. 6 .1, Al 2O 3Wet quick device is in the way of interior electrode 513, outside the conductor, to spray one deck Al with plasma spraying method 2O 3Humidity-sensitive film 512 is processed porous metals electrode 511 and is formed on film.Its sense moor reason is: the stainless-steel tube 513 among the figure as the interior electrode 513 of sensor, is again Al simultaneously promptly 2O 3The carrier of humidity-sensitive film 512.This structure can be regarded a capacitor as, after hydrone sees through the outer metal electrode 511 of porous, then by Al 2O 3Humidity-sensitive film 512 absorption, thus Al caused 2O 3Humidity-sensitive film 512 specific inductive capacity change, and bring the variation of sensor capacitance.Along with the resistance of the increase sensor of steam adsorbance reduces and capacitance is increased.And the logarithm value and the humidity of resistance are linear, and it is wide to have hygrometric scope and working range.
Shown in Fig. 6 .2, be ZrO 2The structural drawing of the wet quick device of type.This structure comprises dustproof filter film 521, the ZrO of printing 2 Humidity sensing layer 522, with 523, one ceramic substrates 524 of Au comb electrode of silk screen print method printing, and two contact conductors 525,526.Humidity sensing layer 522 is a kind of porous ZrO 2Be thick-film material, its available bases metal is regulated the tissue size and is improved its long-time stability.Its sense moor reason is that the result generates proton and participates in conduction because the water of physisorption dissociates on the surface of wet quick device humidity sensing layer.
As shown in Figure 7, be the method flow diagram of the embodiment of the invention based on the hygrometric degree of signal intensity, said method is applied to the rfid system of above-mentioned hygrometric degree, comprising:
701, a said RFID label is placed on certain humidity after following a period of time of level, first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency:
702, said the 2nd RFID label is placed on certain humidity after following a period of time of level; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency;
703, send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals;
Difference when 704, utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of humidity.
The RFID reader can be measured the energy intensity of receiving signal, calculates the fiducial value of a reaction signal intensity, then fiducial value is changed into different humidity values.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, the RFID reader will be from the signal strength values of a RFID label that does not link to each other with wet quick device as a reference value, its with come and signal strength values of the 2nd RFID label that the quick device that wets links to each other compares.Through receive from a RFID label that links to each other with wet quick device and do not link to each other and the signal of the 2nd RFID label with the quick device that wets, the RFID reader can be collected the fiducial value of representing unlike signal intensity.Then, the RFID reader can be converted into the residing humidity level of label to such fiducial value.With regard to a concrete instance, disposing this RFID reader is to be converted into humidity value for the difference from the RF signal intensity that connects the RFID label that does not perhaps connect wet quick device that will receive through the reference data of using storage.
Best situation is, with a RFID label that does not connect wet quick device 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, the variation that wet quick device is applied to the resistance value that can make it in the design concerns with the time length formation that the 2nd RFID label is placed on specified moisture under one to one.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 the certain humidity and this humidity whether within the acceptable range.
The various RFID labels that do not use two antennas also can perceive the variation of humidity with wet quick device, and the variation that the variation of perception humidity 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 wet quick device; The frequency that can make antenna is at ISM (Industrial Scientific Medical; Industry, science, medical science) the interior variation of frequency range, can connect the antenna that this and wet quick device and logical circuit link to each other on the label of standard.
For example label antenna can so be set in a concrete instance; Before in being exposed to certain humidity environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in certain humidity environment, because the influence of humidity; 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 to prevent effectively that a plurality of readers from attempting the conflict of using same frequency to cause in same physical space.
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 wet quick device, so as long as humidity 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 humidity range of expection; Reader can only send instruction to label through channel 1 to n-1; Label also can be made a response because the antenna in the label just can only work in this frequency range, when reader with the frequency of n channel when label sends instruction; So no longer reach the 928MHZ label and just no longer make a response because the variation of label humidity has caused the resonant frequency of label antenna to drop to 899.5-927.5MHZ, pass information back reader.
Favourable aspect is just to be reflected by the disappearance of this information interchange owing to variation that humidity has exceeded the operating frequency of antenna that predefined value causes.
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 humidity causes the frequency of operation of label antenna to take place upwards to be not limited in downward drift and present invention frequency range on average is divided into n channel.
The embodiment of the invention can detect humidity at lower cost and change, and the energy that utilizes RFID to obtain, and has solved the powerup issue of Humidity Detection.
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 (13)

1. the rfid system of a hygrometric degree is characterized in that, the rfid system of said hygrometric degree comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has two pins for the RFID label of the wet quick device of band on the chip of said the 2nd RFID label; Said wet quick device links to each other with these two pins; And form parallel-connection structure with the antenna of said the 2nd RFID label; The variation of extraneous humidity can cause the wet changes in resistance of quick device own; Be placed on certain humidity after following a period of time of level this moment, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
2. the rfid system of hygrometric degree according to claim 1 is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna formation parallel-connection structure of described wet quick device and said the 2nd RFID label.
3. the rfid system of hygrometric degree according to claim 1; It is characterized in that; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
4. the rfid system of hygrometric degree according to claim 1 is characterized in that, said wet quick device is the wet quick device of resistor-type, and said wet quick device comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type, inorganic point are separated the wet quick device of matter formula, the wet quick device of quartz resonance.
5. the rfid system of a hygrometric degree is characterized in that, the rfid system of said hygrometric degree comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label has a pin for the RFID label of the wet quick device of band on the chip of said the 2nd RFID label; One end of said wet quick device 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, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own, be placed on certain humidity after following a period of time of level this moment; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
6. like the rfid system of the said hygrometric degree of claim 5, it is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure.
7. like the rfid system of the said hygrometric degree of claim 5; It is characterized in that; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
8. like the rfid system of the said hygrometric degree of claim 5, it is characterized in that said wet quick device is the wet quick device of resistor-type, the wet quick device of said resistor-type comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type, inorganic point are separated the wet quick device of matter formula, the wet quick device of quartz resonance.
9. the rfid system of a hygrometric degree is characterized in that, the rfid system of said hygrometric degree comprises: RFID reader, a RFID label and the 2nd RFID label, and a said RFID label has identical chip and antenna with said the 2nd RFID label; A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency; Said the 2nd RFID label is the RFID label of the wet quick device of band; Said wet quick device is connected on the antenna of said RFID label; And form parallel-connection structure with antenna, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own, be placed on certain humidity after following a period of time of level this moment; The characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency; A said RFID label and said the 2nd RFID label receive instruction and the feedback signal that said RFID reader sends respectively, and said RFID reader is through relatively detecting the change of humidity from the difference between the signal intensity of a said RFID label and said the 2nd RFID label different frequency.
10. like the rfid system of the said hygrometric degree of claim 9, it is characterized in that the antenna of a said RFID label and said the 2nd RFID label is monopole antenna: the antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure.
11. rfid system like the said hygrometric degree of claim 9; It is characterized in that; The antenna of a said RFID label and said the 2nd RFID label is double-doublet antenna: an antenna of described wet quick device and said the 2nd RFID label forms parallel-connection structure, perhaps forms parallel-connection structure simultaneously with two antennas.
12. the rfid system like the said hygrometric degree of claim 9 is characterized in that, said wet quick device is the wet quick device of resistor-type, and the wet quick device of said resistor-type comprises: MgCr 2O 4-TiO 2Wet quick device, ZnO-Cr 2O 3Wet quick device, ZrO 2Type wet quick device, Al 2O 3Wet quick device, Fe 3O 4Wet quick device, TiO 2-V 2O 5Wet quick device, the wet quick device of high molecular resistance type, the wet quick device of semiconductor-type, inorganic point are separated the wet quick device of matter formula, the wet quick device of quartz resonance.
13. the method for the rfid system hygrometric degree of a hygrometric degree; It is characterized in that; Said method is applied to the rfid system of each said hygrometric degree among the claim 1-4; Or the rfid system of each said hygrometric degree among the claim 5-8, or the rfid system of each said hygrometric degree among the claim 9-12, comprising:
A said RFID label is placed on certain humidity after following a period of time of level, and first resonant frequency and the signal intensity of the antenna of a said RFID label remain unchanged, and this moment, a said RFID label was operated under first resonant frequency:
Said the 2nd RFID label is placed on certain humidity after following a period of time of level, and the characteristic frequency of the antenna of said the 2nd RFID label and signal intensity have one at least and change, and this moment, said the 2nd RFID label was operated under second resonant frequency;
Send instruction through said RFID reader and give a said RFID label and said the 2nd RFID label and receiving feedback signals;
Difference when utilizing the work of more said RFID label of said RFID reader and said the 2nd RFID label between the signal intensity of different frequency detects the change of humidity.
CN201210180318.3A 2012-06-01 2012-06-01 The rfid system of a kind of measuring moisture and the method for measuring moisture thereof Expired - Fee Related CN102737268B (en)

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CN111461269A (en) * 2020-04-07 2020-07-28 南京大学 Diaper humidity detection system based on radio frequency identification technology and working method thereof
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