CN202563540U

CN202563540U - RFID label with moisture sensing device and RFID system

Info

Publication number: CN202563540U
Application number: CN201220258945XU
Authority: CN
Inventors: 霍灵瑜
Original assignee: Beijing Wuzi University
Current assignee: Beijing Wuzi University
Priority date: 2012-06-01
Filing date: 2012-06-01
Publication date: 2012-11-28
Anticipated expiration: 2022-06-01

Abstract

The utility model provides a RFID label with a moisture sensing device and a RFID system; the chip of the RFID label is provided with two pins; a parallel structure is formed by the moisture sensing device and the antennas of the RFID label; a logic circuit capable of controlling conduction is arranged on a line that the moisture sensing device is connected with the chip of the RFID label; the connected line and the logic circuit capable of controlling conduction are one part of the chip; when the logic circuit is cut off, the moisture sensing device is not connected with the antennas in parallel; at this time, the first resonance frequency and the signal strength of the antennas are invariable after the moisture sensing device is placed below a certain humidity level for a while; when the logic circuit is conducted, the moisture sensing device is connected with the antennas in parallel; at this time, the antennas are worked at a second resonance frequency after the moisture sensing device is placed below a certain humidity level for a while; the RFID label receives an instruction sent by a RFID reader so as to control the conduction of the logic circuit; therefore, the RFID label realizes to detect the change of humidity by comparing difference between different frequencies of signal strengths from the antennas; in addition, the change of the humidity can be detected by relatively low cost.

Description

A kind of RFID label, rfid system with wet quick device

Technical field

The utility model relates to RFID (Radio Frequency Identification, RF identification) technical field, relates in particular to a kind of RFID label, rfid system with wet quick device.

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 humidity that the rfid system that has wet quick device 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.

The utility model content

The utility model embodiment provides a kind of RFID label, rfid system with wet quick device, detects humidity at lower cost and changes.

On the one hand, the utility model embodiment provides a kind of RFID label with wet quick device, and two pins are arranged on the chip of said RFID label; Said wet quick device links to each other with these two pins; And form parallel-connection structure with the antenna of said RFID label; The variation of extraneous humidity can cause the wet changes in resistance of quick device own, and the logical circuit of a control break-make is arranged on said wet quick device 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 wet quick device whether with the sky line parallel: when logical circuit breaks off; Wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity.

Optional, in the utility model one embodiment, the antenna of said RFID label is a monopole antenna.

Optional, in the utility model one embodiment, the antenna of said RFID label is a double-doublet antenna: said wet quick device forms parallel-connection structure with antenna wherein; Perhaps said wet quick device and two antennas form parallel-connection structure simultaneously.

Optional, in the utility model one embodiment, 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 utility model embodiment provides a kind of RFID label with wet quick device, and a pin is arranged on the chip of said 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; The variation of extraneous humidity can cause the wet changes in resistance of quick device own, and the logical circuit of a control break-make is arranged on said wet quick device 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 wet quick device whether with the sky line parallel: when logical circuit breaks off; Wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity.

Optional, in the utility model one embodiment, 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 utility model embodiment provides a kind of RFID label with wet quick device; Said wet quick device is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own; On said wet quick device and circuit that antenna is connected, a logical circuit of controlling break-make is arranged; 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 wet quick device whether with the sky line parallel: when logical circuit breaks off, wet quick device not with the sky line parallel; Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity.

Again on the one hand, the utility model embodiment provides a kind of rfid system with wet quick device, and said rfid system comprises RFID label and RFID reader, and said RFID label comprises the RFID label of the wet quick device of above-mentioned band; Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of humidity from the difference between the signal intensity of the different frequency of antenna through comparison.

Technique scheme has following beneficial effect: because on the chip of employing RFID label two pins are arranged; The antenna of wet quick device and RFID label forms parallel-connection structure; On wet quick device and circuit that the chip of RFID label is connected, a logical circuit of controlling break-make is arranged; The circuit of this connection is the part of chip with the logical circuit of control break-make: when logical circuit breaks off; Wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level this moment, and this moment, antenna was operated under second resonant frequency; The RFID label receives the break-make of the instruction of RFID 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 humidity through comparison; 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 utility model embodiment 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 embodiment of the utility model, 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 the wet quick device of the utility model embodiment;

Fig. 2 is the equivalent circuit diagram of RFID label chip inside antenna;

The synoptic diagram that Fig. 3 is connected with RFID label chip inside antenna equivalent electrical circuit for the wet quick device of the utility model embodiment, logic switch;

The synoptic diagram that Fig. 4 directly is connected for wet quick device of the utility model embodiment and RFID label antenna;

Fig. 5 .1-Fig. 5 .2 is the structure key diagram of the wet quick device of the utility model embodiment;

Fig. 6 is the process flow diagram of the utility model embodiment based on humidity level's detection method of signal intensity.

Embodiment

To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, 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 utility model protection.

The wet quick device of the utility model embodiment links to each other with the chip of RFID label and has three kinds of situation at least:

The two pins structure:

The utility model embodiment is a kind of device, system and technology that humidity changes that be used for detecting.This system has comprised a RFID label, and two pins are arranged on the chip of this RFID label.Wet quick device links to each other with these two pins, forms parallel-connection structure with antenna.The variation of extraneous humidity can cause the wet changes in resistance of quick device 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 wet quick device whether with the sky line parallel.When logical circuit breaks off, wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity 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.Wet quick device links to each other with these two pins, forms 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 humidity can cause the wet changes in resistance of quick device own.

When logical circuit is connected, be 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, 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 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 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 wet quick device links to each other with these two pins, 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 humidity can cause the wet changes in resistance of quick device own.And second antenna is all the time with the first resonant frequency proper communication.

When logical circuit is connected, be placed on certain humidity after following a period of time of level, 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 humidity 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 humidity.

Second kind of situation is that wet quick device links to each other with these two pins, forms 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 humidity can cause the wet changes in resistance of quick device own.The situation that this and label only contain an antenna is similar.

When logical circuit is connected, be placed on certain humidity after following a period of time of level, 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 humidity.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, 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:

The chip of this label can only have a pin, 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.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, wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged.

When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity 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.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 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 humidity can cause the wet changes in resistance of quick device own.

When logical circuit is connected, be placed on certain humidity after following a period of time of level, 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 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 a RFID label, and two antennas are arranged on this label.Two kinds of situation are arranged this moment.On the chip that first kind of situation is this label a pin is arranged.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 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 humidity can cause the wet changes in resistance of quick device own.And second antenna is all the time with the first resonant frequency communication.

When logical circuit is connected, be placed on certain humidity after following a period of time of level, 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 humidity 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 humidity.

Second kind of situation is that a pin is arranged on the chip of this label.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 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 humidity can cause the wet changes in resistance of quick device own.The situation that this and label only contain an antenna is similar.

When logical circuit is connected, be placed on certain humidity after following a period of time of level, 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 humidity.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, 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:

When not having pin on the chip of RFID label, wet quick device can directly be 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, detects the change of humidity 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.Wet quick device directly links to each other with first antenna, and second antenna do not link to each other all the time with the first resonant frequency proper communication with wet quick device.When being placed on certain humidity after following a period of time of level, 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 humidity through the difference between the signal intensity of the different frequency of first and second antennas relatively.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 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 humidity.

In an example, the antenna of RFID label links to each other with wet quick device, 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.Be positioned over certain humidity after following a period of time of level when the logical circuit connection and this label apparatus,, 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 wet quick device, when this label apparatus is placed on certain humidity after following a period of time of level, owing to the variation of resonant frequency, will produce the different of secondary signal intensity level and first signal strength values.

As shown in Figure 1, the wet synoptic diagram of label 10 of the sense that is connected with the RFID label chip for the wet quick device of the utility model embodiment.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 wet quick device 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 wet quick 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 certain humidity after following a period of time of level, antenna is operated under second resonant frequency, and its characteristic frequency and signal 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 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.The so wet quick device that can be used for the utility model 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 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 the figure, 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.

Synoptic diagram as shown in Figure 3, as to be connected with RFID label antenna equivalent electrical circuit for the logical circuit of the wet quick device of the utility model embodiment, 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 the wet quick device of representative, and S is the logical circuit of control break-make.When logical circuit breaks off, wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged.When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 that humidity changes for the utility model embodiment.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 utility model 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.

Shown in Fig. 5 .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. 5 .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 6, for the utility model embodiment detects a kind of method flow diagram that humidity 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 wet quick device.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 wet quick device.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 wet quick device.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 humidity 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 be from the signal strength values of the antenna that does not link to each other with wet quick device as a reference value, its with come and signal strength values of the label antenna that the quick device that wets links to each other compares.Through receive from the signal that links to each other with wet quick device with the transmitting terminal that does not link to each other with the quick device that wets, 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 antenna that does not perhaps connect wet quick device that will receive through the reference data of using storage.

Best situation is, with the antenna 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 label is placed on specified moisture under one to one.For example, the quick device that will wet only positions 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 humidity.The same, through using the utility model, 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 utility model frequency range on average is divided into n channel.

The utility model embodiment can detect humidity at lower cost to be changed, 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 utility model embodiment lists, 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 the utility model embodiment protection.

Various illustrative logical block described in the utility model embodiment; 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 utility model embodiment 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 utility model embodiment 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; Purpose, technical scheme and beneficial effect to the utility model have carried out further explain, it should be understood that the above is merely the embodiment of the utility model; And be not used in the protection domain that limits the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.

Claims

1. the RFID label of the wet quick device of band is characterized in that two pins are arranged on the chip of said RFID label; Said wet quick device links to each other with these two pins; And form parallel-connection structure with the antenna of said RFID label; The variation of extraneous humidity can cause the wet changes in resistance of quick device own, and the logical circuit of a control break-make is arranged on said wet quick device 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 wet quick device whether with the sky line parallel: when logical circuit breaks off; Wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity.

2. be with the RFID label of wet quick device according to claim 1, it is characterized in that the antenna of said RFID label is a monopole antenna.

3. the RFID label of the wet quick device of band according to claim 1 is characterized in that the antenna of said RFID label is a double-doublet antenna: said wet quick device forms parallel-connection structure with antenna wherein; Perhaps said wet quick device and two antennas form parallel-connection structure simultaneously.

4. the RFID label of the wet quick device of band is characterized in that a pin is arranged on the chip of said 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; The variation of extraneous humidity can cause the wet changes in resistance of quick device own, and the logical circuit of a control break-make is arranged on said wet quick device 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 wet quick device whether with the sky line parallel: when logical circuit breaks off; Wet quick device not with the sky line parallel, be placed on certain humidity after following a period of time of level this moment, first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity.

5. like the RFID label of the wet quick device of the said band of claim 4, it is characterized in that the antenna of said RFID label is a monopole antenna.

6. like the RFID label of the wet quick device of the said band of claim 4, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said wet quick device forms parallel-connection structure with antenna wherein; Perhaps said wet quick device and two antennas form parallel-connection structure simultaneously.

7. the RFID label of the wet quick device of band; It is characterized in that; Said wet quick device is connected on the antenna of said RFID label, and forms parallel-connection structure with antenna, and the variation of extraneous humidity can cause the wet changes in resistance of quick device own; On said wet quick device and circuit that antenna is connected, a logical circuit of controlling break-make is arranged; 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 wet quick device whether with the sky line parallel: when logical circuit breaks off, wet quick device not with the sky line parallel; Be placed on certain humidity after following a period of time of level this moment, and first resonant frequency and the signal intensity of antenna remain unchanged; When logical circuit is connected, a wet quick device and a day line parallel, be placed on certain humidity after following a period of time of level 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 humidity.

8. like the RFID label of the wet quick device of the said band of claim 7, it is characterized in that the antenna of said RFID label is a monopole antenna.

9. like the RFID label of the wet quick device of the said band of claim 7, it is characterized in that the antenna of said RFID label is a double-doublet antenna: said wet quick device forms parallel-connection structure with antenna wherein; Perhaps said wet quick device and two antennas form parallel-connection structure simultaneously.

10. the rfid system of the wet quick device of band, said rfid system comprises RFID label and RFID reader, it is characterized in that,

Said RFID label comprises the RFID label of the wet quick device of each said band among the claim 1-3, or the RFID label of the wet quick device of each said band among the claim 4-6, or the RFID label of the wet quick device of each said band among the claim 7-9;

Said RFID reader sends the break-make of instruction with the logical circuit of control RFID label, thereby detects the change of humidity from the difference between the signal intensity of the different frequency of antenna through comparison.