CN102750578A - RFID (Radio Frequency Identification Devices) label with mechanical displacement detector, RFID system and mechanical displacement detection method - Google Patents
RFID (Radio Frequency Identification Devices) label with mechanical displacement detector, RFID system and mechanical displacement detection method Download PDFInfo
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- CN102750578A CN102750578A CN2012101836613A CN201210183661A CN102750578A CN 102750578 A CN102750578 A CN 102750578A CN 2012101836613 A CN2012101836613 A CN 2012101836613A CN 201210183661 A CN201210183661 A CN 201210183661A CN 102750578 A CN102750578 A CN 102750578A
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Abstract
The invention provides an RFID (Radio Frequency Identification Devices) label with a mechanical displacement detector, an RFID system and a mechanical displacement detection method. Two pins are arranged on the chip of the RFID label; the mechanical displacement detector is connected in parallel with the antenna of the RFID label, a logic circuit for controlling connection and disconnection is arranged on the connection line of the mechanical displacement detector and the chip of the RFID label, and the connection line and the logic circuit for controlling connection and disconnection are parts of the chip; when the logic circuit is disconnected, the mechanical displacement detector is not connected in parallel with the antenna, and the first resonant frequency and signal intensity of the antenna remain unchanged when the mechanical displacement detector is placed on a moving object; when the logic circuit is connected, the mechanical displacement detector is connected in parallel with the antenna, and the antenna works under a second resonant frequency when the logic circuit is placed on the moving object; and the RFID label receives a command sent by an RFID reader so as to control the connection and disconnection of the logic circuit, thus realizing the detection of displacement change through comparing the difference between intensities of signals which have different frequencies and are from the antenna. Through the invention, the displacement change can be detected with low 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 and mechanical shift detection method with the mechanical shift pick-up unit.
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, 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 mechanical shift that the rfid system that has the mechanical shift pick-up unit has been used to monitor product environment of living in has surpassed the acceptable mechanical shift.In general these equipment requirements induction installations will have a lasting energy source, are used for detecting the change of mechanical shift, 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, to be used for detecting mechanical change in displacement.
Summary of the invention
The embodiment of the invention provides a kind of RFID label with the mechanical shift pick-up unit, rfid system and mechanical shift detection method, detects mechanical change in displacement at lower cost.
On the one hand, the embodiment of the invention provides a kind of RFID label with displacement detector, and two pins are arranged on the chip of said RFID label; Two pins of said displacement detector and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of extraneous displacement can cause the changes in resistance of displacement detector own, and the logical circuit of a control break-make is arranged on said displacement detector and circuit that the chip of RFID label is connected, and the circuit of this connection and the logical circuit of controlling break-make are the parts of chip; The break-make of logical circuit determined displacement detector whether with the sky line parallel: when logical circuit breaks off; Displacement detector not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, displacement detector was placed on the mobile object 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 FRID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of displacement.
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 displacement detector forms parallel-connection structure with antenna wherein; Perhaps said displacement detector and two antennas form parallel-connection structure simultaneously.
Optional; In an embodiment of the present invention; Said displacement detector is the resistor-type displacement detector, and said displacement detector comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector.
On the other hand, the embodiment of the invention provides a kind of RFID label with displacement detector, and a pin is arranged on the chip of said RFID label; One end of said displacement detector 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 extraneous displacement can cause the changes in resistance of displacement detector own, and the logical circuit of a control break-make is arranged on said displacement detector and circuit that the chip of RFID label is connected, and the circuit of this connection and the logical circuit of controlling break-make are the parts of chip; The break-make of logical circuit determined displacement detector whether with the sky line parallel: when logical circuit breaks off; Displacement detector not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, displacement detector was placed on the mobile object 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 FRID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of displacement.
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 displacement detector forms parallel-connection structure with antenna wherein; Perhaps said displacement detector and two antennas form parallel-connection structure simultaneously.
Optional; In an embodiment of the present invention; Said displacement detector is the resistor-type displacement detector, and said resistor-type displacement detector comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector.
Another aspect; The embodiment of the invention provides a kind of RFID label with displacement detector; Said displacement detector is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of extraneous displacement can cause the changes in resistance of displacement detector own; The logical circuit that a control break-make is arranged on said displacement detector and circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined displacement detector whether with the sky line parallel: when logical circuit breaks off, displacement detector not with the sky line parallel; Be placed on the mobile object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, displacement detector was placed on the mobile object 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 FRID reader transmission with control logic circuit, thereby realizes detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of displacement.
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 displacement detector forms parallel-connection structure with antenna wherein; Perhaps said displacement detector and two antennas form parallel-connection structure simultaneously.
Optional; In an embodiment of the present invention; Said displacement detector is the resistor-type displacement detector, and said resistor-type displacement detector comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector.
On the one hand, the embodiment of the invention provides a kind of rfid system with displacement detector again, and said rfid system comprises RFID label and FRID reader, and said RFID label comprises the RFID label of above-mentioned band displacement detector; Said FRID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of displacement 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 displacement detecting method of the rfid system with displacement detector; Said displacement detecting method is applied to the rfid system of above-mentioned band displacement detector, comprising: send the break-make of instruction with the logical circuit of control RFID label through said FRID reader; Receive the break-make of the instruction of FRID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Displacement detector not with the sky line parallel; Be placed on the mobile object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, displacement detector was placed on the mobile object 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 FRID reader to detect the change of displacement from the difference between the signal intensity of the different frequency of antenna.
Technique scheme has following beneficial effect: because on the chip of employing RFID label two pins are arranged; The antenna of displacement detector and RFID label forms parallel-connection structure; The logical circuit that a control break-make is arranged on displacement detector and circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make: when logical circuit breaks off; Displacement detector not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, displacement detector was placed on the mobile object with a day line parallel, this moment, and this moment, antenna was operated under second resonant frequency; The RFID label receives the break-make of the instruction of FRID reader transmission with control logic circuit; Thereby realize detecting from the difference between the signal intensity of the different frequency of antenna the technological means of the change of displacement through comparison; So reached the technique effect that detects mechanical change in displacement at lower cost; And the energy that utilizes RFID to obtain, solved the powerup issue that mechanical shift 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 mechanical shift pick-up unit;
Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;
Fig. 3 is the synoptic diagram that embodiment of the invention mechanical shift pick-up unit, logic switch are connected with RFID label chip inside antenna equivalent electrical circuit;
The synoptic diagram that Fig. 4 directly is connected for embodiment of the invention mechanical shift pick-up unit and RFID label antenna;
Fig. 5. be the structure key diagram of embodiment of the invention mechanical shift pick-up unit;
Fig. 6 is the process flow diagram of the embodiment of the invention based on the mechanical shift level 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 mechanical shift pick-up unit 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 embodiment of the invention is a kind of device, system and technology that is used for detecting mechanical change in displacement.This system has comprised a RFID label, and two pins are arranged on the chip of this RFID label.Two pins of mechanical shift pick-up unit and this link to each other, and form parallel-connection structure with antenna.The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the circuit of this connection is the part of chip with the logical circuit of control break-make.
The break-make of logical circuit determined the mechanical shift pick-up unit whether with the sky line parallel.When logical circuit breaks off, the mechanical shift pick-up unit not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object 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.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can detect the change of mechanical shift 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 RFID label, has only an antenna on this label.Two pins are arranged on the chip of this label.Two pins of mechanical shift pick-up unit and this link to each other, and form parallel-connection structure with this root antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own.
The machinery displacement detector is placed on the mobile object when logical circuit is connected, 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.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of mechanical shift.Or rather; The mechanical shift pick-up unit should have lower resistance, and its instantiation comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.Two kinds of situation are arranged this moment.First kind of situation is that two pins of mechanical shift pick-up unit and this link to each other, and forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own.And second antenna is all the time with the first resonant frequency proper communication.
When logical circuit is connected, be placed on the mobile object, the characteristic frequency of first antenna and signal intensity have at least a meeting to change, and it is operated under second resonant frequency.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency of first and second antennas can detect the change of mechanical shift 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 detect the change of mechanical shift.
Second kind of situation is that two pins of mechanical shift pick-up unit and this link to each other, and form parallel-connection structure simultaneously with two antennas.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own.The situation that this and label only contain an antenna is similar.
The machinery displacement detector is placed on the mobile object 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.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of mechanical shift.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; The mechanical shift pick-up unit should have lower resistance, and its instantiation comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector 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 mechanical shift pick-up unit, and the other end of mechanical shift pick-up unit 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.
When logical circuit breaks off, the mechanical shift pick-up unit not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object 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.The RFID reader can send the break-make of instruction control logical circuit to label, when logical circuit is connected, can detect the change of mechanical shift 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 RFID label, has only an antenna on this label.A pin is arranged on the chip of this label.The mechanical shift pick-up unit links to each other with this pin, and the mechanical shift pick-up unit other end is directly linked on the antenna, forms parallel-connection structure with antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own.
The machinery displacement detector is placed on the mobile object when logical circuit is connected, and antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have one at least and change.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency during through the comparison logic break-make can detect the change of mechanical shift.Or rather; The mechanical shift pick-up unit should have lower resistance, and its instantiation comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector etc.
With regard to another instance, this system has comprised a RFID label, and two antennas are arranged on this label.A pin is arranged on the chip of this label.The mechanical shift pick-up unit links to each other with this pin, and the mechanical shift pick-up unit other end is directly linked on the antenna, forms parallel-connection structure with first antenna.The logical circuit of a control break-make is arranged on pin and circuit that chip is connected, and the logical circuit of the circuit of this connection and control break-make is the part of chip.The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own.And second antenna is all the time with the first resonant frequency communication.
When logical circuit is connected, be placed on the mobile object, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change.The RFID reader can send instruction to label, and the difference between the signal intensity of the different frequency of first and second antennas can detect the change of mechanical shift when connecting through comparison logic.Difference between the signal intensity of the different frequency during logical circuit break-make through first antenna self relatively also can detect the change of mechanical shift.Or rather; The mechanical shift pick-up unit should have lower resistance, and its instantiation comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector etc.
No pin configuration:
When not having pin on the chip of RFID label, the mechanical shift pick-up unit can directly be linked on the antenna.In this case, the antenna that links to each other with the mechanical shift pick-up unit can not break away from mechanical displacement detector and with normal frequency for communication.When being placed on the mobile object, the characteristic frequency of antenna and signal intensity have one at least and change.The RFID reader can send instruction to label apparatus, detects the change of mechanical shift 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 RFID label, and two antennas are arranged on this label.The mechanical shift pick-up unit directly links to each other with first antenna, and second antenna do not link to each other with the mechanical shift pick-up unit all the time with the first resonant frequency proper communication.When being placed on the mobile object, first antenna is operated under second resonant frequency, and its characteristic frequency and signal intensity have at least a meeting to change, and the characteristic frequency of second antenna and signal intensity are constant.The RFID reader can send instruction to label, and can detect the change of mechanical shift through the difference between the signal intensity of the different frequency of first and second antennas relatively.Or rather; The mechanical shift pick-up unit should have lower resistance, and its instantiation comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector 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 mechanical shift pick-up units accordingly, the model of mechanical shift pick-up unit can be the same or different simultaneously.With regard to a kind of instantiation of device, when being placed on the mobile object, the characteristic frequency of the antenna that links to each other with the mechanical shift pick-up unit and signal intensity have at least a meeting to change.The RFID reader can send instruction to label apparatus, detects the change of mechanical shift from the difference between the signal intensity of the different frequency of antenna through comparison.
With regard to a kind of instantiation of mechanical shift pick-up unit, 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 mechanical shift value of majority, can detect the level of mechanical shift simultaneously based on the above-mentioned comparison of mentioning.
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.Fiducial value between the signal strength values when reading device being installed being signal strength values and logical circuit in order accepting to connect and to break off from the logical circuit of label, and be converted into these fiducial values the varying level of mechanical shift.
In an example, the antenna of RFID label links to each other with the mechanical shift pick-up unit, and the logical circuit of a control break-make is arranged on this connection line.Under logical circuit break-make whether two kinds of situation, have two kinds of corresponding with it different frequencies with antenna.Connect and be positioned over this label apparatus on the mobile object when logical circuit,, will produce the intensity level of two kinds of unlike signals 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 the mechanical shift pick-up unit, when this label apparatus is placed on the mobile object, owing to the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal strength values.
On the one hand, the embodiment of the invention provides a kind of rfid system with displacement detector again, and said rfid system comprises RFID label and FRID reader, and said RFID label comprises the RFID label of above-mentioned band displacement detector; Said FRID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of displacement 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 displacement detecting method of the rfid system with displacement detector; Said displacement detecting method is applied to the rfid system of above-mentioned band displacement detector, comprising: send the break-make of instruction with the logical circuit of control RFID label through said FRID reader; Receive the break-make of the instruction of FRID reader transmission through the RFID label: when logical circuit breaks off with control logic circuit; Displacement detector not with the sky line parallel; Be placed on the mobile object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, displacement detector was placed on the mobile object 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 FRID reader to detect the change of displacement from the difference between the signal intensity of the different frequency of antenna.
As shown in Figure 1, the synoptic diagram of the displacement sensor label 10 that is connected with the RFID label chip for embodiment of the invention mechanical shift pick-up unit.Among Fig. 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 mechanical shift pick-up unit 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.Whether mechanical displacement detecting module 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 on the mobile object, 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 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 mechanical shift pick-up unit of mentioning; When antenna 11,12 is placed on the mobile object, the mechanical shift pick-up unit 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, the mechanical shift pick-up unit is positioned on the mobile object, will cause sending 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 mechanical shift environment, and when reaching certain mechanical shift, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under certain mechanical shift level, and it will rise when reaching certain mechanical shift level.Can be used for such mechanical shift pick-up unit of the present invention has: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector etc.
Type based on the mechanical shift pick-up unit is different, and the mechanical shift level that causes changing possibly be that a specific mechanical shift value also possibly be a scope of mechanical shift 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 mechanical shift pick-up unit 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, comprises coil inductance (L), the stray capacitance (C of label antenna
p) and shunt capacitance (C
2), its resonance frequency does
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 3, be the synoptic diagram that is connected with RFID label antenna equivalent electrical circuit of logical circuit of embodiment of the invention mechanical shift pick-up unit, control break-make.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
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 representative machinery displacement detector, and S is the logical circuit of control break-make.When logical circuit breaks off, the mechanical shift pick-up unit not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object with a day line parallel, this moment, 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 4, can detect the sketch of the passive RFID tags device 40 of mechanical change in displacement 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 mechanical shift pick-up unit 44 that links to each other with antenna 42 will influence the resistance of antenna 42.The material that mechanical shift pick-up unit 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 mechanical shift pick-up unit of mentioning, when antenna 41; 42 are placed on the mobile object, and the mechanical shift pick-up unit 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, the mechanical shift pick-up unit is positioned on the mobile object, will cause sending 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 mechanical shift environment, and when reaching certain mechanical shift, it will reduce then.In another example, the antenna frequencies of setting at the beginning is lower than the antenna frequencies under certain mechanical shift level, and it will rise when reaching certain mechanical shift level.The such mechanical shift pick-up unit that can be used for this invention has: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector etc.
Type based on the mechanical shift pick-up unit is different, and the mechanical shift level that causes changing possibly be that a specific mechanical shift value also possibly be a scope of mechanical shift 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 mechanical shift pick-up unit 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 potentiometric transducer, it is by resistive element 51, brush 52, rotating shaft 53, travelling arm 54 is formed.The two ends of resistive element link to each other with weld tabs A, C, so the resistance value of A, C end is the resistance value of resistive element.Rotary shaft links to each other with travelling arm, and travelling arm rotates thereupon when regulating rotating shaft; End at travelling arm is equipped with brush, and it leans on the elasticity of travelling arm to be pressed on the resistive element and closely contact with it, and the other end of travelling arm links to each other with weld tabs B.
As shown in Figure 6, for the embodiment of the invention detects a kind of method flow diagram that mechanical shift changes through the label apparatus that uses many antennas.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 the mechanical shift pick-up unit.54, the electromagnetic wave that label apparatus will carry energy is converted into a DC (direct current) voltage, 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 the mechanical shift pick-up unit.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 the mechanical shift pick-up unit.64, the energy intensity of signal is received in the reader measurement.66, reader calculated goes out the fiducial value of a reaction signal intensity.68, reader changes into different mechanical shift values 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 the mechanical shift pick-up unit from the signal strength values of the antenna that does not link to each other with the mechanical shift pick-up unit as a reference value.Through receive from the signal that links to each other with the mechanical shift pick-up unit with the transmitting terminal that does not link to each other with the mechanical shift pick-up unit, reader can be collected the fiducial value of representing unlike signal intensity.Then, the RFID reader can be converted into the residing mechanical shift level of label to such fiducial value.With regard to a concrete instance, disposing this RFID reader is to be converted into the mechanical shift value for the difference from the RF signal intensity that connects the antenna that does not perhaps connect mechanical displacement detector that will receive through the reference data of using storage.
Best situation is, with the antenna that does not connect mechanical displacement detector 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 mechanical shift pick-up unit 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 mechanical displacement and forms relation one to one.For example; The mechanical shift pick-up unit 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 certain mechanical shift.The same, the application of the invention, under the passive condition of RFID label, the RFID reader can detect label apparatus whether be placed on the mobile object and the mechanical shift of this object whether within the acceptable range.
Do not use the various RFID labels of two antennas also can perceive the variation of mechanical shift with the mechanical shift pick-up unit, the variation that the variation of sense mechanism displacement 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 the mechanical shift pick-up unit; 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 mechanical shift pick-up unit 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 certain mechanical shift environment; The resonant frequency of antenna is 902-928MHZ, but in a single day label is exposed in certain mechanical shift environment, because the influence of mechanical shift; 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 the mechanical shift pick-up unit, so as long as mechanical shift 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 mechanical shift scope 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 mechanical shift 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 mechanical shift 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 mechanical shift 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 mechanical change in displacement at lower cost, and the energy that utilizes RFID to obtain, and has solved the powerup issue that mechanical shift 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 (illustrativelogical 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 (illustrativecomponents), 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 the mechanical shift pick-up unit is characterized in that, two pins are arranged on the chip of said RFID label; Two pins of said mechanical shift pick-up unit and this link to each other; And form parallel-connection structure with the antenna of said RFID label; The variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own; The logical circuit that a control break-make is arranged on said mechanical shift pick-up unit and circuit that the chip of RFID label is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined the mechanical shift pick-up unit whether with the sky line parallel: when logical circuit breaks off, the mechanical shift pick-up unit not with the sky line parallel; Be placed on the mobile object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object 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 detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of mechanical shift.
2. according to claim 1 with the RFID label of mechanical shift pick-up unit, 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 mechanical shift pick-up unit, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said mechanical shift pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said mechanical shift pick-up unit and two antennas form parallel-connection structure simultaneously.
4. according to claim 1 with the RFID label of mechanical shift pick-up unit; It is characterized in that; Said mechanical shift pick-up unit is a resistor-type mechanical shift pick-up unit, and said resistor-type mechanical shift pick-up unit comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector.
5. the RFID label with the mechanical shift pick-up unit is characterized in that, a pin is arranged on the chip of said RFID label; One end of said mechanical shift pick-up unit 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 extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own, and the logical circuit of a control break-make is arranged on said mechanical shift pick-up unit and circuit that the chip of RFID label is connected, and the circuit of this connection and the logical circuit of controlling break-make are the parts of chip; The break-make of logical circuit determined the mechanical shift pick-up unit whether with the sky line parallel: when logical circuit breaks off; The mechanical shift pick-up unit not with the sky line parallel, this moment be placed on the mobile object, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object 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 detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of mechanical shift.
6. like the RFID label of the said band mechanical shift of claim 5 pick-up unit, it is characterized in that the antenna of said RFID label is a monopole antenna.
7. like the RFID label of the said band mechanical shift of claim 5 pick-up unit, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said mechanical shift pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said mechanical shift pick-up unit and two antennas form parallel-connection structure simultaneously.
8. like the RFID label of the said band mechanical shift of claim 5 pick-up unit; It is characterized in that; Said mechanical shift pick-up unit is a resistor-type mechanical shift pick-up unit, and said resistor-type mechanical shift pick-up unit comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector.
9. RFID label with the mechanical shift pick-up unit; It is characterized in that; Said mechanical shift pick-up unit is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of extraneous mechanical shift can cause the changes in resistance of mechanical shift pick-up unit own; The logical circuit that a control break-make is arranged on said mechanical shift pick-up unit and circuit that antenna is connected; The circuit of this connection is the part of chip with the logical circuit of control break-make, the break-make of logical circuit determined the mechanical shift pick-up unit whether with the sky line parallel: when logical circuit breaks off, the mechanical shift pick-up unit not with the sky line parallel; Be placed on the mobile object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object 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 detecting from the difference between the signal intensity of the different frequency of antenna through comparison the change of mechanical shift.
10. like the RFID label of the said band mechanical shift of claim 9 pick-up unit, it is characterized in that the antenna of said RFID label is a monopole antenna.
11. the RFID label like the said band mechanical shift of claim 9 pick-up unit is characterized in that, the antenna of said RFID label is a double-doublet antenna: said mechanical shift pick-up unit forms parallel-connection structure with antenna wherein; Perhaps said mechanical shift pick-up unit and two antennas form parallel-connection structure simultaneously.
12. RFID label like the said band mechanical shift of claim 9 pick-up unit; It is characterized in that; Said mechanical shift pick-up unit is a resistor-type mechanical shift pick-up unit, and said resistor-type mechanical shift pick-up unit comprises: potentiometer formula sensor, WW POT formula sensor, non-wire-wound potentiometer formula sensor, photopotentiometer formula sensor, capacitive displacement pick-up unit, pole-changing are apart from formula capacitance-sensitive device, variable area formula capacitance-sensitive device, eddy current type displacement detector, reluctance type displacement detector.
13. the rfid system with the mechanical shift pick-up unit, 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 mechanical shift pick-up unit among the claim 1-4; Or the RFID label of each said band mechanical shift pick-up unit among the claim 5-8, or the RFID label of each said band mechanical shift pick-up unit among the claim 9-12;
Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of mechanical shift from the difference between the signal intensity of the different frequency of antenna through comparison.
14. the mechanical shift detection method with the rfid system of mechanical shift pick-up unit is characterized in that, said mechanical shift detection method is applied to the rfid system of the said band mechanical shift of claim 13 pick-up unit, 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; The mechanical shift pick-up unit not with the sky line parallel; Be placed on the mobile object this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit was connected, the mechanical shift pick-up unit was placed on the mobile object 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 detect the change of mechanical shift from the difference between the signal intensity of the different frequency of antenna.
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| CN2012101836613A CN102750578A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with mechanical displacement detector, RFID system and mechanical displacement detection method |
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| CN2012101836613A CN102750578A (en) | 2012-06-01 | 2012-06-01 | RFID (Radio Frequency Identification Devices) label with mechanical displacement detector, RFID system and mechanical displacement detection method |
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| CN103940357A (en) * | 2014-03-26 | 2014-07-23 | 北京卓越经纬测控技术有限公司 | Non-contact spatial displacement measurement device |
| CN105139047A (en) * | 2015-08-19 | 2015-12-09 | 南京理工大学 | Polarized RFID system without chips |
| CN105160364A (en) * | 2015-07-30 | 2015-12-16 | 株洲时代装备技术有限责任公司 | RFID-based member relative displacement detection method |
| CN108988121A (en) * | 2018-07-25 | 2018-12-11 | 北京小米移动软件有限公司 | Optical devices and equipment |
| CN109631734A (en) * | 2019-01-02 | 2019-04-16 | 上海坤锐电子科技有限公司 | A kind of displacement detector and displacement detecting method |
| CN110017760A (en) * | 2019-04-15 | 2019-07-16 | 同济大学 | Passive and wireless displacement sensor and displacement sensing system based on helical antenna |
| CN110030917A (en) * | 2019-04-15 | 2019-07-19 | 同济大学 | Using the passive and wireless displacement sensor and displacement sensing system of circular patch antenna |
| CN111164399A (en) * | 2017-10-24 | 2020-05-15 | 川崎重工业株式会社 | Fastening member looseness detection mark |
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| CN110017760B (en) * | 2019-04-15 | 2024-05-10 | 同济大学 | Passive wireless displacement sensor and displacement sensing system based on spiral antenna |
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Application publication date: 20121024 |