CN102693401B - The rfid system of a kind of testing temperature and the method for testing temperature thereof - Google Patents
The rfid system of a kind of testing temperature and the method for testing temperature thereof Download PDFInfo
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- CN102693401B CN102693401B CN201210183476.4A CN201210183476A CN102693401B CN 102693401 B CN102693401 B CN 102693401B CN 201210183476 A CN201210183476 A CN 201210183476A CN 102693401 B CN102693401 B CN 102693401B
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Abstract
The present invention provides the rfid system of a kind of testing temperature and the method for testing temperature thereof, and this system includes: RFID reader, the first RFID label tag and the second RFID label tag, and above-mentioned label has identical chip and antenna；After first RFID label tag is placed on certain temperature levels lower a period of time, it is operated under the first resonant frequency；Second RFID label tag is the RFID label tag with temperature sensitive device, the antenna of temperature sensitive device and the second RFID label tag forms parallel-connection structure, the circuit that the chip of temperature sensitive device and the second RFID label tag connects there is a voltage resistance conversion equipment, the circuit of this connection and this voltage resistance conversion equipment are parts for chip, after second RFID label tag is placed on certain temperature levels lower a period of time, it is operated under the second resonant frequency；First RFID label tag and the second RFID label tag receive instruction the feedback signal that RFID reader sends respectively, and RFID reader detects the change of temperature by comparing from the difference between the signal intensity of the first RFID label tag and the second RFID label tag different frequency.It can detect variations in temperature at lower cost.
Description
Technical field
The present invention relates to RFID (Radio Frequency Identification, RF identification) technical field, particularly relate to one
Plant rfid system and the method for testing temperature thereof of testing temperature.
Background technology
In recent years, rfid system had become more prevalent.Rfid system is mainly used in the identification to people and thing.General next
Saying, this system includes at least a RFID reader, and this RFID reader can be sent out in the range of a setting
Penetrate and accept the radiofrequency signal from one or more RFID label tag.This RFID label tag is usually encapsulated, can
With patch on one object, it includes that one can carry out the chip of communication for information with antenna, and this chip is microchip, one
Being an integrated circuit from the point of view of as, it can be used to store and process information, modulation /demodulation radiofrequency signal, and can run
Other specific function.The antenna of RFID label tag is used to receive and send radiofrequency signal, and is commonly available to a kind of special
Different frequency.
In some equipment, the rfid system of a kind of testing temperature has been used for monitoring when the temperature of product local environment surpasses
Cross acceptable temperature.In general these equipment requirements induction installations to have a lasting energy source, is used for examining
The change of testing temperature, but this can increase the cost of equipment.It addition, some equipment requirements induction installations also to compare with one
Device circuit is connected, thus detects the degree size of deviation reference voltage, and this requirement considerably increases the cost of equipment.
In a word, improving what rfid system was a need for, it requires do not using lasting energy source or using a kind of low cost
Adjunct circuit time can be used to detect variations in temperature.
Summary of the invention
The embodiment of the present invention provides a kind of rfid system and the method for testing temperature thereof of testing temperature, detects temperature at lower cost
Degree change.
On the one hand, embodiments provide the rfid system of a kind of testing temperature, the rfid system bag of described testing temperature
Include: RFID reader, the first RFID label tag and the second RFID label tag, described first RFID label tag and described 2nd RFID
Label has identical chip and antenna；After described first RFID label tag is placed on certain temperature levels lower a period of time,
First resonant frequency of the antenna of described first RFID label tag and signal intensity keep constant, the most described RFID mark
Label are operated under the first resonant frequency；Described second RFID label tag is the RFID label tag with temperature sensitive device, described 2nd RFID
Two pins are had on the chip of label；Described temperature sensitive device is connected with the two pin, and with described second RFID label tag
Antenna forms parallel-connection structure, has an electricity piezo-resistive conversion on the circuit of the chip connection of temperature sensitive device and the second RFID label tag
Device, the circuit of this connection and this electricity piezo-resistive conversion equipment are parts for chip, and the change of ambient temperature can cause temperature sensitive
Device both end voltage or the change of electric current, the most described second RFID label tag is placed on certain temperature levels lower a period of time
After, the characteristic frequency of the antenna of described second RFID label tag and signal intensity at least have one and change, now described
Second RFID label tag is operated under the second resonant frequency；Described first RFID label tag and described second RFID label tag connect respectively
Receiving instruction feedback signal that described RFID reader sends, described RFID reader is by comparing from a described RFID
Difference between the signal intensity of label and described second RFID label tag different frequency detects the change of temperature.
Optionally, in an embodiment of the present invention, the antenna of described first RFID label tag and described second RFID label tag is equal
For monopole antenna: described temperature sensitive device forms parallel-connection structure with the antenna of described second RFID label tag.
Optionally, in an embodiment of the present invention, the antenna of described first RFID label tag and described second RFID label tag is equal
For double-doublet antenna: an antenna of described temperature sensitive device and described second RFID label tag forms parallel-connection structure, or with
Two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described electricity piezo-resistive conversion equipment includes: a variable voltage is converted into can
The device of power transformation resistance or ditch type field effect transistor or an equivalent circuit for field effect transistor, described temperature sensitive device includes: thermocouple
The brilliant temperature sensitive device of the temperature sensitive device of temperature sensitive device, quasiconductor, PN junction, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated
Temperature sensitive device.
On the other hand, the rfid system of a kind of testing temperature, the rfid system of described testing temperature are embodiments provided
Including: RFID reader, the first RFID label tag and the second RFID label tag, described first RFID label tag and described second
RFID label tag has identical chip and antenna；When described first RFID label tag is placed on certain temperature levels next section
After between, the first resonant frequency of the antenna of described first RFID label tag and signal intensity keep constant, the most described RFID
Labeling task is under the first resonant frequency；Described second RFID label tag is the RFID label tag with temperature sensitive device, described second
A pin is had on the chip of RFID label tag；One end of described temperature sensitive device is connected with this pin, and the other end is connected to institute
Stating on the antenna of RFID label tag, and form parallel-connection structure with antenna, the chip in temperature sensitive device and the second RFID label tag connects
Having an electricity piezo-resistive conversion equipment on the circuit connect, the circuit of this connection and this electricity piezo-resistive conversion equipment are of chip
Point, the change of ambient temperature can cause temperature sensitive device both end voltage or the change of electric current, the most described second RFID label tag to put
Putting under certain temperature levels after a period of time, the characteristic frequency of the antenna of described second RFID label tag and signal intensity are extremely
I haven't seen you for ages has one to change, and the most described second RFID label tag is operated under the second resonant frequency；A described RFID
Label and described second RFID label tag receive instruction feedback signal, the described RFID that described RFID reader sends respectively
Reader is by comparing between the signal intensity of described first RFID label tag and described second RFID label tag different frequency
Difference detect the change of temperature.
Optionally, in an embodiment of the present invention, the antenna of described first RFID label tag and described second RFID label tag is equal
For monopole antenna: described temperature sensitive device forms parallel-connection structure with the antenna of described second RFID label tag.
Optionally, in an embodiment of the present invention, the antenna of described first RFID label tag and described second RFID label tag is equal
For double-doublet antenna: an antenna of described temperature sensitive device and described second RFID label tag forms parallel-connection structure, or with
Two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described electricity piezo-resistive conversion equipment includes: a variable voltage is converted into can
The device of power transformation resistance or ditch type field effect transistor or an equivalent circuit for field effect transistor, described temperature sensitive device includes: thermocouple
The brilliant temperature sensitive device of the temperature sensitive device of temperature sensitive device, quasiconductor, PN junction, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated
Temperature sensitive device.
Another aspect, embodiments provides the rfid system of a kind of testing temperature, the rfid system of described testing temperature
Including: RFID reader, the first RFID label tag and the second RFID label tag, described first RFID label tag and described second
RFID label tag has identical chip and antenna；When described first RFID label tag is placed on certain temperature levels next section
After between, the first resonant frequency of the antenna of described first RFID label tag and signal intensity keep constant, the most described RFID
Labeling task is under the first resonant frequency；Described second RFID label tag is the RFID label tag with temperature sensitive device, described temperature sensitive
Device is connected on the antenna of described RFID label tag, and forms parallel-connection structure with antenna, at temperature sensitive device and the 2nd RFID
An electricity piezo-resistive conversion equipment, the circuit of this connection and this electricity piezo-resistive conversion equipment is had on the circuit that the chip of label connects
Being a part for chip, the change of ambient temperature can cause temperature sensitive device both end voltage or the change of electric current, and the most described second
After RFID label tag is placed on certain temperature levels lower a period of time, the characteristic frequency of the antenna of described second RFID label tag and
Signal intensity at least has one and changes, and the most described second RFID label tag is operated under the second resonant frequency；Described
First RFID label tag and described second RFID label tag receive instruction the feedback signal that described RFID reader sends respectively,
Described RFID reader is by comparing from described first RFID label tag and the signal of described second RFID label tag different frequency
Difference between intensity detects the change of temperature.
Optionally, in an embodiment of the present invention, the antenna of described first RFID label tag and described second RFID label tag is equal
For monopole antenna: described temperature sensitive device forms parallel-connection structure with the antenna of described second RFID label tag.
Optionally, in an embodiment of the present invention, the antenna of described first RFID label tag and described second RFID label tag is equal
For double-doublet antenna: an antenna of described temperature sensitive device and described second RFID label tag forms parallel-connection structure, or with
Two antennas concurrently form parallel-connection structure.
Optionally, in an embodiment of the present invention, described electricity piezo-resistive conversion equipment includes: a variable voltage is converted into can
The device of power transformation resistance or ditch type field effect transistor or an equivalent circuit for field effect transistor, described temperature sensitive device includes: thermocouple
The brilliant temperature sensitive device of the temperature sensitive device of temperature sensitive device, quasiconductor, PN junction, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated
Temperature sensitive device.
Another further aspect, the method embodiments providing the rfid system testing temperature of a kind of testing temperature, described method should
For the rfid system of above-mentioned testing temperature, including: described first RFID label tag is placed on certain temperature levels next
After the section time, the first resonant frequency of the antenna of described first RFID label tag and signal intensity keep constant, and the most described the
One RFID label tag is operated under the first resonant frequency: described second RFID label tag is placed on certain temperature levels next
After the section time, the characteristic frequency of the antenna of described second RFID label tag and signal intensity at least have one and change, this
Shi Suoshu the second RFID label tag is operated under the second resonant frequency；Described is sent instructions to by described RFID reader
One RFID label tag and described second RFID label tag also receive feedback signal；Utilize described RFID reader more described first
When RFID label tag and described second RFID label tag work, the difference between the signal intensity of different frequency detects changing of temperature
Become.
Technique scheme has the advantages that because using the rfid system of described testing temperature to include: RFID reads
Device, the first RFID label tag and the second RFID label tag, described first RFID label tag and described second RFID label tag have phase
Same chip and antenna；After described first RFID label tag is placed on certain temperature levels lower a period of time, described first
RFID label tag is operated under the first resonant frequency；Described second RFID label tag is the RFID label tag with temperature sensitive device, described
Temperature sensitive device forms parallel-connection structure, at temperature sensitive device and the core of the second RFID label tag with the antenna of described second RFID label tag
Having an electricity piezo-resistive conversion equipment on the circuit that sheet connects, the circuit of this connection and this electricity piezo-resistive conversion equipment are chips
A part, after the most described second RFID label tag is placed on certain temperature levels lower a period of time, described 2nd RFID
Labeling task is under the second resonant frequency；Described first RFID label tag and described second RFID label tag receive described RFID respectively
The instruction of reader transmission feedback signal, described RFID reader is by comparing from described first RFID label tag and institute
State the difference between the signal intensity of the second RFID label tag different frequency to detect the technological means of the change of temperature, so reaching
To detecting the technique effect of variations in temperature at lower cost, and utilize the energy that RFID obtains, solve temperature detection
Powerup issue.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing skill
In art description, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to root
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the rfid system structural representation of a kind of testing temperature of the embodiment of the present invention；
The schematic diagram that Fig. 2 is the temperature sensitive device of the embodiment of the present invention and the second RFID label chip is connected；
Fig. 3 is the equivalent circuit diagram of the embodiment of the present invention the second RFID label chip inside antenna；
Fig. 4 is the temperature sensitive device of the embodiment of the present invention, electricity piezo-resistive conversion equipment and the second RFID label chip inside antenna etc.
The schematic diagram that effect circuit is connected；
Fig. 5 is that the temperature sensitive device of the embodiment of the present invention is joined directly together, with RFID label antenna, the schematic diagram connect；
Fig. 6 .1-Fig. 6 .2 is the structure explanatory diagram of the temperature sensitive device of the embodiment of the present invention；
Fig. 7 is the method flow diagram of embodiment of the present invention testing temperature based on signal intensity.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly and completely
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise
Execute example, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, be the rfid system structural representation of a kind of testing temperature of the embodiment of the present invention, the RFID of described testing temperature
System includes: RFID reader the 1, first RFID label tag 2 and the second RFID label tag 3, described first RFID label tag 2
With described second RFID label tag 3, there is identical chip and antenna；Described first RFID label tag 2 is placed on certain
After temperature levels lower a period of time, the first resonant frequency of the antenna of described first RFID label tag 2 and signal intensity keep not
Becoming, the most described first RFID label tag 2 is operated under the first resonant frequency；Described second RFID label tag 3 is temperature sensitive for band
The RFID label tag of device, described temperature sensitive device forms parallel-connection structure, temperature sensitive with the antenna of described second RFID label tag 3
An electricity piezo-resistive conversion equipment, the circuit of this connection and this electricity is had on the circuit that the chip of device and the second RFID label tag connects
Piezo-resistive conversion equipment is a part for chip, and the change of ambient temperature can cause temperature sensitive device both end voltage or the change of electric current
Change, after the most described second RFID label tag is placed on certain temperature levels lower a period of time, described second RFID label tag 3
The characteristic frequency of antenna and signal intensity at least have one and change, the most described second RFID label tag 3 is operated in
Under second resonant frequency；Described first RFID label tag 2 and described second RFID label tag 3 receive described RFID respectively and read
The instruction of device 1 transmission feedback signal, described RFID reader 1 is by comparing from described first RFID label tag 2 He
Difference between the signal intensity of described second RFID label tag 3 different frequency detects the change of temperature.The embodiment of the present invention
Temperature sensitive device and the second RFID label tag chip be connected at least exist three kinds of situations:
Two pins structure:
The embodiment of the present invention is a kind of rfid system for detecting variations in temperature.This system contains two RFID marks
Sign: the first RFID label tag and the second RFID label tag.Have two pins on the chip of the second RFID label tag, temperature sensitive device with
The two pin is connected, and forms parallel-connection structure with antenna, the circuit that the chip in temperature sensitive device and the second RFID label tag connects
On have an electricity piezo-resistive conversion equipment, the circuit of this connection and this electricity piezo-resistive conversion equipment are parts for chip, the external world
The change of temperature can cause temperature sensitive device both end voltage or the change of electric current.The most described second RFID label tag is placed on one
After fixed temperature levels lower a period of time, the first resonant frequency of the antenna of the first RFID label tag and signal intensity keep constant.
The characteristic frequency of the antenna of the second RFID label tag and signal intensity at least have one and change, and now Antenna Operation is
Under two resonant frequencies.RFID reader can send instruction to label, it is achieved communication, can mark by comparing a RFID
Sign and difference between the signal intensity of different frequency detects the change of temperature during the work of the second RFID label tag.
For an example, this system contains a kind of RFID label tag, described label comprise the first RFID label tag and
Second RFID label tag, the first RFID label tag and the second RFID label tag all only have an antenna.The core of the second RFID label tag
Having two pins on sheet, temperature sensitive device is connected with the two pin, forms parallel-connection structure with antenna.At temperature sensitive device and second
Having an electricity piezo-resistive conversion equipment on the circuit that the chip of RFID label tag connects, the circuit of this connection and this electricity piezo-resistive are changed
Device is a part for chip, and the change of ambient temperature can cause temperature sensitive device both end voltage or the change of electric current, now described
After second RFID label tag is placed on certain temperature levels lower a period of time, the first of the antenna of the first RFID label tag is altogether
Vibration frequency and signal intensity keep constant.The characteristic frequency of the antenna of the second RFID label tag and signal intensity at least have one
Changing, now Antenna Operation is under the second resonant frequency.RFID reader can send instruction to label, it is achieved logical
Letter, can by compare the first RFID label tag and the second RFID label tag work time different frequency signal intensity between difference
The different change detecting temperature.
More precisely, described electricity piezo-resistive conversion equipment includes: a variable voltage is converted into variable-resistance device or
Ditch type field effect transistor or the equivalent circuit etc. of field effect transistor, described temperature sensitive device includes: the temperature sensitive device of thermocouple, quasiconductor
Temperature sensitive device, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
For another example, this system contains two RFID label tag: the first RFID label tag and the 2nd RFID
Label；First RFID label tag and the second RFID label tag have two antennas.Two are had to draw on the chip of the second RFID label tag
Foot, temperature sensitive device is connected with the two pin, concurrently forms parallel-connection structure with two antennas, at temperature sensitive device and the 2nd RFID
An electricity piezo-resistive conversion equipment, the circuit of this connection and this electricity piezo-resistive conversion equipment is had on the circuit that the chip of label connects
It it is a part for chip.The change of ambient temperature can cause temperature sensitive device both end voltage or the change of electric current.This is with the 2nd RFID
Label only contains the situation of an antenna and is similar to.After being now placed on certain temperature levels lower a period of time, a RFID
First resonant frequency of the antenna of label and signal intensity keep constant.The characteristic frequency of the antenna of the second RFID label tag and letter
Number intensity at least has one and changes, and the most described second RFID label antenna is operated under the second resonant frequency.RFID
Reader can send instruction to label, it is achieved communication, can be by comparing the first RFID label tag and the second RFID label tag
During work, difference between the signal intensity of different frequency detects the change of temperature.More precisely, described electricity piezo-resistive turns
Changing device includes: a variable voltage is converted into variable-resistance device or ditch type field effect transistor or an equivalence for field effect transistor
Circuit etc., described temperature sensitive device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, crystal
Manage temperature sensitive device, the temperature sensitive device of IGCT, integrated temperature sensitive device etc..
One pin configuration:
This system contains two RFID label tag: the first RFID label tag and the second RFID label tag, the second RFID label tag
Chip on have a pin, this pin outwards one end with temperature sensitive device is connected, and the other end of temperature sensitive device is attached directly to
On antenna.Pin is similar at the junction point of chip internal and the situation of two pins, finally remains and to reach and sky line parallel
Purpose.Having an electricity piezo-resistive conversion equipment on the circuit that the chip of temperature sensitive device and the second RFID label tag connects, this is even
The circuit connect and this electricity piezo-resistive conversion equipment are parts for chip, and the change of ambient temperature can cause temperature sensitive device two ends electricity
Pressure or the change of electric current.After being now placed on certain temperature levels lower a period of time, the antenna of the first RFID label tag
First resonant frequency and signal intensity keep constant.The characteristic frequency of the antenna of the second RFID label tag and signal intensity are to I haven't seen you for ages
Having one to change, the most described second RFID label antenna is operated under the second resonant frequency.RFID reader can
Instruction is sent, it is achieved communication to label, can be different with during the second RFID label tag work by comparing the first RFID label tag
Difference between the signal intensity of frequency detects the change of temperature.
For an example, this system contains two RFID label tag: the first RFID label tag and the second RFID label tag；
First RFID label tag and the second RFID label tag all only have an antenna.A pin is had on the chip of the second RFID label tag,
Temperature sensitive device is connected with this pin, and the temperature sensitive device other end is attached directly on antenna, forms parallel-connection structure with antenna,
Have an electricity piezo-resistive conversion equipment on the circuit that the chip of temperature sensitive device and the second RFID label tag connects, the circuit of this connection and
This electricity piezo-resistive conversion equipment is a part for chip.The change of ambient temperature can cause temperature sensitive device both end voltage or electric current
Change.After being now placed on certain temperature levels lower a period of time, the first resonance frequency of the antenna of the first RFID label tag
Rate and signal intensity keep constant.The characteristic frequency of the antenna of the second RFID label tag and signal intensity at least have a generation
Change, the most described second RFID label antenna is operated under the second resonant frequency.RFID reader can send to label
Instruction, it is achieved communication, can by compare the first RFID label tag and the second RFID label tag work time different frequency signal
Difference between intensity detects the change of temperature.More precisely, described electricity piezo-resistive conversion equipment includes: one can power transformation
Pressure is converted into variable-resistance device or ditch type field effect transistor or an equivalent circuit etc. for field effect transistor, described temperature sensitive device
Including: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, IGCT temperature
Quick device, integrated temperature sensitive device etc..
Without pin configuration:
This system contains two RFID label tag: the first RFID label tag and the second RFID label tag, the 2nd RFID marks
Pin, temperature sensitive device is not had to be attached directly on antenna on the chip signed.In this case, the antenna being connected with temperature sensitive device is not
Can depart from temperature sensitive device and with normal frequency for communication.After being placed on certain temperature levels lower a period of time, antenna
Characteristic frequency and signal intensity at least have one and change.RFID reader can send instruction to label apparatus, real
Now communicate, by comparing from the difference between the signal intensity of the first RFID label tag and the different frequency of the second RFID label tag
The different change detecting temperature.
For an example, this system contains two RFID label tag: the first RFID label tag and the second RFID label tag；
First RFID label tag and the second RFID label tag all only have an antenna.Pin is not had, temperature on the chip of the second RFID label tag
Quick device is attached directly on antenna, has an electricity piezo-resistive on the circuit of the chip connection of temperature sensitive device and the second RFID label tag
Conversion equipment, the circuit of this connection and this electricity piezo-resistive conversion equipment are parts for chip.The change of ambient temperature can cause
Temperature sensitive device both end voltage or the change of electric current.After being now placed on certain temperature levels lower a period of time, a RFID
First resonant frequency of the antenna of label and signal intensity keep constant.The characteristic frequency of the antenna of the second RFID label tag and letter
Number intensity at least has one and changes, and the most described second RFID label antenna is operated under the second resonant frequency.RFID
Reader can send instruction to label, and by comparing different frequency when the first RFID label tag and second labeling task
Signal intensity between difference can detect the change of temperature.More precisely, described electricity piezo-resistive conversion equipment includes:
One variable voltage is converted into variable-resistance device or ditch type field effect transistor or an equivalent circuit etc. for field effect transistor, described
Temperature sensitive device includes: the brilliant temperature sensitive device of the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction, the temperature sensitive device of transistor,
The temperature sensitive device of IGCT, integrated temperature sensitive device etc..
In the same way, the chip of antenna can also can carry one can also carry multiple pin without pin by band.My god
The radical of line can be one, two the most.One or more temperature sensitive device can also be connected accordingly, simultaneously
The model of temperature sensitive device can be the same or different.For a kind of instantiation of device, when being placed on certain temperature
After degree level lower a period of time, at least meeting of the characteristic frequency of the antenna being connected with temperature sensitive device and signal intensity changes
Become.RFID reader can to label apparatus send instruction, by compare the different frequency from antenna signal intensity it
Between difference detect the change of temperature.
For the instantiation of a kind of temperature sensitive device, simultaneous compares the method for numerical value and includes these compare numerical value and majority
Signal strength values compares.These signal strength values belong to different frequencies, and are associated, simultaneously with most temperature values
The level of temperature can be detected based on comparison mentioned above.
But, for another aspect, a rfid system includes that two RFID label tag devices and a RFID read
Device device.The two RFID label tag device is used to send two kinds of signals, i.e. the signal of the first RFID label tag and second
The signal of RFID label tag, reader receives signal and the signal of the second RFID label tag of the first RFID label tag respectively, passes through
Fiducial value between first RFID label tag and the signal strength values of the second RFID label tag of background process, and these are compared
Value is converted into the varying level of temperature.
Another further aspect, the method embodiments providing the rfid system testing temperature of a kind of testing temperature, described method should
For the rfid system of above-mentioned testing temperature, including: described first RFID label tag is placed on certain temperature levels next
After the section time, the first resonant frequency of the antenna of described first RFID label tag and signal intensity keep constant, and the most described the
One RFID label tag is operated under the first resonant frequency: described second RFID label tag is placed on certain temperature levels next
After the section time, the characteristic frequency of the antenna of described second RFID label tag and signal intensity at least have one and change, this
Shi Suoshu the second RFID label tag is operated under the second resonant frequency；Described is sent instructions to by described RFID reader
One RFID label tag and described second RFID label tag also receive feedback signal；Utilize described RFID reader more described first
When RFID label tag and described second RFID label tag work, the difference between the signal intensity of different frequency detects changing of temperature
Become.
As in figure 2 it is shown, the temperature sensitive label 10 being connected for the temperature sensitive device of the embodiment of the present invention and the second RFID label chip
Schematic diagram.In Fig. 2, label apparatus 10, including a base 15, a surface-mounted integrated circuit 13, two pins 16,17
With a double-doublet antenna 11,12.Having two pins 16,17 on surface-mounted integrated circuit 13, the two pin is outwards with temperature sensitive
Device 14 is connected, and the two pin is in parallel with the equivalent circuit of antenna at chip internal.This label can be carried out with reader
Communication.
In an example, transmitting terminal 11,12 are made up of one or more different low electrical resistant materials, and these materials have higher
Electric conductivity, such as copper, silver, and aluminum, they and temperature sensitive device mentioned above are by two pins 16,17 and antenna
11,12 are connected, and when antenna 11, after 12 are placed on certain temperature levels lower a period of time, temperature sensitive device can cause one
Individual or the change of multiple transmitting terminal generation resonant frequency, thus cause a different frequency.The change of this frequency and reception
The most different with the frequency sent.Such as, after temperature sensitive device is positioned over certain temperature levels lower a period of time, may result in
Transmission frequency and accept in frequency that at least one changes.
In another example, the antenna frequencies value set at the beginning will be above the antenna frequencies under uniform temperature environment, then
When reaching certain temperature, it will reduce.In another example, the antenna frequencies set at the beginning is less than a constant temperature
Antenna frequencies under degree level, when reaching certain temperature levels, it will be gone up.Can be used for the such temperature sensitive of the present invention
Device has: MgCr2O4-TiO2Temperature sensitive device, ZnO-Cr2O3Temperature sensitive device, ZrO2The temperature sensitive device of type, Al2O3Temperature sensitive dress
Put, Fe3O4Temperature sensitive device, TiO2-V2O5The temperature sensitive device of temperature sensitive device, high molecular resistance type, semiconductor-type temperature sensitive device (Se
The temperature sensitive device of (selenium) evaporating film, silicon MOS type Al2O3Temperature sensitive device), inorganic solution the temperature sensitive device of matter formula (step on Morse LiCl
The temperature sensitive device of temperature sensitive device, impregnated, DWS-P type LiCl (lithium chloride) thermo-sensitive resistor device), quartz resonance temperature sensitive
Device etc..
Type based on temperature sensitive device is different, causes the temperature levels of change to be probably a specific temperature value and is also likely to be one
The scope of individual selectively temperature value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also can be led
Cause different changes.Such as, on antenna with the type of temperature sensitive device can affect change antenna resonance frequency required time
Length.
As it is shown on figure 3, be the equivalent circuit diagram of the first RFID label antenna.Produce when tag coil antenna enters read write line
Alternating magnetic field in, the interaction between label antenna and reading and writing device antenna is similar to transformator.Both coils are suitable
Primary coil and secondary coil in transformator.The resonant tank formed by label antenna is as it can be seen, include label antenna
Coil inductance (L), parasitic capacitance (Cp) and shunt capacitance (C2), its resonant frequency is
In formula, C is
CpAnd C2Parallel equivalent electric capacity, R1, R2For circuit internal inductance coil and the equivalent resistance of other devices.Label and read-write
The carrier frequency that device two-way communication uses is exactly f.When requiring that tag antenna coil profile is the least, i.e. area is little, and needs certain
Operating distance, the aerial coil mutual induction amount that RFID label tag and read write line are asked the most substantially can not meet actual demand, Ke Yi
Tag antenna coil is internal inserts the Ferrite Material with high permeability, to increase mutual induction amount, thus bucking coil cross section
Little problem.
As shown in Figure 4, for the temperature sensitive device of the embodiment of the present invention, electricity piezo-resistive conversion equipment with the second RFID label antenna
The schematic diagram that equivalent circuit is connected.The resonant tank formed by label antenna is as it can be seen, include the coil electricity of label antenna
Sense (L), parasitic capacitance (Cp) and shunt capacitance (C2), its resonant frequency is
Formula C is CpAnd C2
Parallel equivalent electric capacity, R1, R2For circuit internal inductance coil and the equivalent resistance of other devices.R3For connecting with temperature sensitive device
Equivalent resistance, F be electricity piezo-resistive conversion equipment.M is the variable resistance representing temperature sensitive device.This label is placed on one
After fixed temperature levels lower a period of time, its characteristic frequency and signal intensity at least have one and change, and Antenna Operation exists
Under second resonant frequency.
As it is shown in figure 5, the sketch of the passive RFID tags device 40 of variations in temperature can be detected for the embodiment of the present invention.Such as figure
Shown in 4, label apparatus 40 includes a base 45, an integrated circuit 43 and a double-doublet antenna 41,42.With sky
The temperature sensitive device 44 that line 42 is connected will affect the resistance of antenna 42.The material that temperature sensitive device 44 is suitable for can be according to sky
Line 41, the current voltage of any in 42 controls any one frequency both pinpointed.For an example, peace
Dress antenna 41,42 can make it produce resonance in identical frequency.For another example, installing antenna 41,42 can
So that it produces resonance in different frequencies.
In an example, transmitting terminal double-doublet antenna 41,42 is made up of one or more different low electrical resistant materials, this
A little materials have higher electric conductivity, such as copper, silver, and aluminum, and they are connected with temperature sensitive device mentioned above, when antenna 41,
After 42 are placed on certain temperature levels lower a period of time, temperature sensitive device can cause one or more transmitting terminal that resonance frequency occurs
The change of rate, thus cause a different frequency.The change of this frequency is the most different with the frequency received and send.Example
As, after temperature sensitive device is positioned over certain temperature levels lower a period of time, may result in transmission frequency and accept in frequency at least
One changes.
In another example, the antenna frequencies value set at the beginning will be above the antenna frequencies under uniform temperature environment, then
When reaching certain temperature, it will reduce.In another example, the antenna frequencies set at the beginning is less than a constant temperature
Antenna frequencies under degree level, when reaching certain temperature levels, it will rise.Can be used for such temperature of this invention
Quick device includes: the temperature sensitive device of thermocouple, the temperature sensitive device of quasiconductor, PN junction brilliant temperature sensitive device, the temperature sensitive device of transistor, crystalline substance
The temperature sensitive device of brake tube, integrated temperature sensitive device etc..
Type based on temperature sensitive device is different, causes the temperature levels of change to be probably a specific temperature value and is also likely to be one
The scope of individual selectively temperature value.The length of time necessarily causes the change of antenna resonance frequency, and antenna quality also can be led
Cause different changes.Such as, on antenna with the type of temperature sensitive device can affect change antenna resonance frequency required time
Length.
As shown in Fig. 6 .1, an exemplary construction of thermocouple includes thermode 511,512, platinum-rhodium wire 513, and pure platinum filament 514,
Protection shell 515 and pad 516.This thermocouple has that action response is fast, it is little, flexible good, strong to measure end thermal capacity
The advantages such as degree is high, kind is many.
As shown in Fig. 6 .2, for the temperature sensitive device of PN junction.When the scope of measurement is at 0～150 DEG C, utilize the voltage of diode PN junction
With the characteristic of temperature, can be made into the temperature sensitive device of PN junction, not only linear ratio thermocouple is good, and sensitivity can reach 2mV/ DEG C.
Owing to the hole in quasiconductor and electron concentration are greatly influenced by temperature, the temperature therefore made according to the temperature characterisitic of quasiconductor
Sensor is used widely on the medical instrument.Its accuracy of thermometer made with PN junction is mainly by the reading of display instrument
Number accuracy determines, its sensitivity is also that other kinds of sensor is unapproachable.
As it is shown in fig. 7, be the method flow diagram of embodiment of the present invention testing temperature based on signal intensity, described method is applied to
The rfid system of above-mentioned testing temperature, including:
701, after described first RFID label tag being placed on certain temperature levels lower a period of time, a described RFID mark
First resonant frequency of the antenna signed and signal intensity keep constant, and the most described first RFID label tag is operated in the first resonance
Under frequency:
702, after described second RFID label tag being placed on certain temperature levels lower a period of time, described 2nd RFID mark
Characteristic frequency and the signal intensity of the antenna signed at least have one and change, and the most described second RFID label tag is operated in
Under second resonant frequency；
703, described first RFID label tag and described second RFID label tag are sent instructions to also by described RFID reader
Receive feedback signal；
When 704, utilizing more described first RFID label tag of described RFID reader and described second RFID label tag to work not
Difference between the signal intensity of same frequency detects the change of temperature.
RFID reader can measure the energy intensity receiving signal, calculates the fiducial value of a reaction signal intensity, then
Fiducial value is changed into different temperature values.For an example, reader can set a time period for receiving label
Signal, without receiving signal, signal intensity will be recorded as 0 by reader.
In this system, RFID reader is by the signal strength values from the first RFID label tag not being connected with temperature sensitive device
As a reference value, the signal strength values of the second RFID label tag that it is connected with temperature sensitive device compares.Logical
Cross receive from the first RFID label tag being connected with temperature sensitive device and be not connected with temperature sensitive device and the second RFID label tag
Signal, RFID reader can collect the fiducial value representing unlike signal intensity.Then, RFID reader can be so
One fiducial value is converted into the temperature levels residing for label.For a concrete example, configure this RFID reader
Be in order to the reference data stored by use by receive from connecting or be not connected to the RFID label tag of temperature sensitive device
The difference of RF signal intensity is converted into temperature value.
Best situation is, using be not connected to temperature sensitive device the first RFID label tag as a reference, can be by due to label
With the change that the coupling between reader is caused filters out.Additionally, as previously mentioned, temperature sensitive device is employed
The time length formation one that the change of its resistance value is placed under specified temp can be made with the second RFID label tag in design
One-to-one correspondence.Ibid, the application of the invention, under conditions of RFID label tag is passive, RFID reader can be examined
Measure label apparatus be placed at a temperature of certain and this temperature the most within the acceptable range.
The various RFID label tag not using two antennas also can perceive the change of temperature with temperature sensitive device, sense temperature
Change is also to be able to recognize antenna based on the change of resonant frequency on antenna to receive the change of signal.
Such as by the design to the antenna being connected with temperature sensitive device, it is possible to make the frequency of antenna at ISM (Industrial
Scientific Medical, industry, science, medical science) the interior change of frequency range, the label of standard can connect this and warm
The antenna that quick device and logic circuit are connected.
Such as in a concrete example, label antenna can so set, before being exposed in uniform temperature environment, and sky
The resonant frequency of line is 902-928MHZ, but label is once exposed in uniform temperature environment, due to the impact of temperature, sky
The resonant frequency of line just reduces to 899.5-927.5MHZ, divided at the frequency bins (902-928MHZ) of U.S. RFID
Being 52 channels, the channel that can not receive of skipping that reader can be random in these 52 channels goes, and reader is this
The benefit jumped can effectively prevent multiple reader from attempting to use same frequency institute in same physical space exactly
The conflict caused.
The most in one example, RFID frequency range (902-928MHZ) is not divided into 52 channels but averagely divides
The antenna settings having become n channel tag is operated under this frequency range (902-928MHZ).Due to label antenna and temperature
Quick device is connected, as long as so temperature has exceeded the scope of value set in advance, the operating frequency of antenna tag antenna just declines
Among (899.5-927.5MHZ) this frequency range.Therefore compared with original frequency range just by channel n from frequency range model
Enclosing middle eliminating to go, therefore the frequency range (899.5-927.5MHZ) after change just no longer allows label and channel n to carry out information
Exchange.
In concrete example, if the environment at label place has exceeded intended temperature range, reader can only pass through channel
1 to n-1 sends instruction to label, and label also can be made a response, because the antenna in label just can only be in this frequency range
Interior work, when reader sends instruction with the frequency of n channel to label, because the change of label temperature already leads to label
The resonant frequency of antenna has descended to 899.5-927.5MHZ and no longer reaches 928MHZ so label is the most no longer made a response,
Transmit information back to reader.
Favourable aspect is that the change of the operating frequency of antenna caused beyond value set in advance due to temperature is just by this letter
Cease the disappearance of exchange and reflect.
In a model, reader can further confirm that to label one instruction between channel n-1 and channel n of transmission
Once the operating frequency range of label antenna has occurred that drift, is sent by channel n-1 because label can receive
Instruction, and can by channel n-1 can be to reader feedback information because label can not receive by channel n
The instruction sent, and can not thus determine the work of label antenna to reader feedback information by channel n
Working frequency scope has occurred that drift.
The change of temperature causes the operating frequency of label antenna to occur drift up and down and current invention not to limit
Frequency range is averagely being divided into n channel by system.
The embodiment of the present invention can detect variations in temperature at lower cost, and utilizes the energy that RFID obtains, and solves temperature
The powerup issue of detection.
The enforcement of each feature of this system may relate to software, and hardware is likely to relate to the combination ability of software and hardware
Reaching, the enforcement of many advantages of such as system is by programming a kind of high-caliber process and OO programming language
Realize with the mode mutually exchanged of computer and other equipment machines.Each such function program may be stored in one
Individual storage intermediary is read by a computer and processor in such as read only memory and realizes above-mentioned function.
Those skilled in the art are it will also be appreciated that the various illustrative components, blocks (illustrative that list of the embodiment of the present invention
Logical block), unit, and step can pass through electronic hardware, computer software, or both combinations realize.For
Clearly show that the replaceability (interchangeability) of hardware and software, above-mentioned various illustrative components (illustrative
Components), unit and step the most universally describe their function.Such function is by hardware or soft
Part realizes depending on specifically applying the design requirement with whole system.Those skilled in the art can be specific for every kind
Application, it is possible to use the function described in the realization of various methods, but this realization is understood not to protect beyond the embodiment of the present invention
The scope protected.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, numeral
Signal processor, special IC (ASIC), field programmable gate array (FPGA) or other FPGA dress
Put, discrete gate or transistor logic, discrete hardware components, or the design of any of the above described combination realizes or operates described
Function.General processor can be microprocessor, alternatively, this general processor can also be any traditional processor,
Controller, microcontroller or state machine.Processor can also realize, such as at digital signal by calculating the combination of device
Reason device and microprocessor, multi-microprocessor, one or more microprocessors one Digital Signal Processor Core of associating, or appoint
What its similar configuration realizes.
Method or the step of algorithm described in the embodiment of the present invention can be directly embedded into hardware, the software mould of processor execution
Block or the combination of both.Software module can be stored in RAM memory, flash memory, ROM memory, EPROM
In memorizer, eeprom memory, depositor, hard disk, moveable magnetic disc, CD-ROM or this area, other is any
In the storage medium of form.Exemplarily, storage medium can be connected with processor, so that processor can be from storage matchmaker
Jie reads information, it is possible to deposit write information to storage medium.Alternatively, storage medium can also be integrated in processor.
Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and
Storage medium can also be arranged in the different parts in user terminal.
In one or more exemplary designs, the above-mentioned functions described by the embodiment of the present invention can hardware, software,
The combination in any of firmware or this three realizes.If realized in software, these functions can store the matchmaker with computer-readable
On Jie, or it is transmitted on the medium of computer-readable with one or more instructions or code form.Computer readable medium includes computer
Store medium and be easy to so that allowing computer program transfer to the telecommunication media in other place from a place.Storage medium can be
Any general or special computer can be with the useable medium of access.Such as, such computer readable media can include but not
It is limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device,
Other any may be used for carrying or storage with instruction or data structure and other can by general or special computer or general or
Special processor reads the medium of the program code of form.Additionally, any connection can be properly termed computer-readable
Medium, such as, if software is by coaxial cable, a light from a web-site, server or other remote resource
Fine computer, twisted-pair feeder, Digital Subscriber Line (DSL) or with the wireless way for transmittings such as the most infrared, wireless and microwave also by
It is included in defined computer readable medium.Described video disc (disk) and disk (disc) include Zip disk, radium-shine
Dish, CD, DVD, floppy disk and Blu-ray Disc, disk is generally with magnetic duplication data, and video disc generally carries out light with laser
Learn and replicate data.Combinations of the above can also be included in computer readable medium.
Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Illustrate, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should wrap
Within being contained in protection scope of the present invention.
Claims (7)
1. the rfid system of a testing temperature, it is characterised in that the rfid system bag of described testing temperature
Include: RFID reader, the first RFID label tag and the second RFID label tag, described first RFID label tag and
Described second RFID label tag has identical chip and antenna；Described first RFID label tag is placed on one
After fixed temperature levels lower a period of time, the first resonant frequency of the antenna of described first RFID label tag and letter
Number intensity keeps constant, and the most described first RFID label tag is operated under the first resonant frequency；Described second
RFID label tag is the RFID label tag with temperature sensitive device, and the chip of described second RFID label tag has two to draw
Foot；Described temperature sensitive device is connected with the two pin, and is formed also with the antenna of described second RFID label tag
Connection structure, the antenna of wherein said first RFID label tag and described second RFID label tag is monopole sky
During line, described temperature sensitive device forms parallel-connection structure with the antenna of described second RFID label tag；Described first
When the antenna of RFID label tag and described second RFID label tag is double-doublet antenna, described temperature sensitive device
Form parallel-connection structure with an antenna of described second RFID label tag, or concurrently form also with two antennas
Connection structure；
The circuit that the chip of temperature sensitive device and the second RFID label tag connects has an electricity piezo-resistive conversion dress
Putting, the circuit of this connection and this electricity piezo-resistive conversion equipment are parts for chip, the change of ambient temperature
Change can cause temperature sensitive device both end voltage or the change of electric current, the most described second RFID label tag to be placed on one
After fixed temperature levels lower a period of time, characteristic frequency and the signal of the antenna of described second RFID label tag are strong
Degree at least has one and changes, and the most described second RFID label tag is operated under the second resonant frequency；
Described first RFID label tag and described second RFID label tag receive the finger that described RFID reader sends respectively
Order feedback signal, described RFID reader is by comparing from described first RFID label tag and described the
Difference between the signal intensity of two RFID label tag different frequencies detects the change of temperature；
Described temperature sensitive device is the temperature sensitive device of PN junction；
When the antenna of described second RFID label tag enters in the alternating magnetic field that RFID reader produces, described
Transformator is formed, with thinking temperature sensitive device between antenna and the antenna of RFID reader of the second RFID label tag
Energy source, the antenna of the second RFID label tag and the antenna of RFID reader is provided to be respectively at the beginning of transformator
Level coil and secondary coil, described temperature sensitive device will by the most interconnective electric charge pump and rectification circuit
The electromagnetic wave that the antenna of the second RFID label tag receives is converted to DC voltage, with thinking described 2nd RFID mark
Sign and the instruction offer energy source that described RFID reader sends is provided.
2. the rfid system of testing temperature as claimed in claim 1, it is characterised in that described electricity piezo-electric
Resistance conversion equipment includes: a variable voltage be converted into variable-resistance device or a ditch type field effect transistor,
Or the equivalent circuit of field effect transistor.
3. the rfid system of a testing temperature, it is characterised in that the rfid system bag of described testing temperature
Include: RFID reader, the first RFID label tag and the second RFID label tag, described first RFID label tag and
Described second RFID label tag has identical chip and antenna；Described first RFID label tag is placed on one
After fixed temperature levels lower a period of time, the first resonant frequency of the antenna of described first RFID label tag and letter
Number intensity keeps constant, and the most described first RFID label tag is operated under the first resonant frequency；Described second
RFID label tag is the RFID label tag with temperature sensitive device, and the chip of described second RFID label tag has one to draw
Foot；One end of described temperature sensitive device is connected with this pin, and the other end is connected to the sky of described RFID label tag
On line, and form parallel-connection structure, wherein said first RFID label tag and described 2nd RFID mark with antenna
When the antenna signed is monopole antenna, described temperature sensitive device and the dwi hastasana of described second RFID label tag
Become parallel-connection structure；The antenna of described first RFID label tag and described second RFID label tag is quadripole sky
During line, described temperature sensitive device forms parallel-connection structure with an antenna of described second RFID label tag, or
Parallel-connection structure is concurrently formed with two antennas；
The circuit that the chip of temperature sensitive device and the second RFID label tag connects has an electricity piezo-resistive conversion dress
Putting, the circuit of this connection and this electricity piezo-resistive conversion equipment are parts for chip, the change of ambient temperature
Change can cause temperature sensitive device both end voltage or the change of electric current, the most described second RFID label tag to be placed on one
After fixed temperature levels lower a period of time, characteristic frequency and the signal of the antenna of described second RFID label tag are strong
Degree at least has one and changes, and the most described second RFID label tag is operated under the second resonant frequency；
Described first RFID label tag and described second RFID label tag receive the finger that described RFID reader sends respectively
Order feedback signal, described RFID reader is by comparing from described first RFID label tag and described the
Difference between the signal intensity of two RFID label tag different frequencies detects the change of temperature；
Described temperature sensitive device is the temperature sensitive device of PN junction；
When the antenna of described second RFID label tag enters in the alternating magnetic field that RFID reader produces, described
Transformator is formed, with thinking temperature sensitive device between antenna and the antenna of RFID reader of the second RFID label tag
Energy source, the antenna of the second RFID label tag and the antenna of RFID reader is provided to be respectively at the beginning of transformator
Level coil and secondary coil, described temperature sensitive device will by the most interconnective electric charge pump and rectification circuit
The electromagnetic wave that the antenna of the second RFID label tag receives is converted to DC voltage, with thinking described 2nd RFID mark
Sign and the instruction offer energy source that described RFID reader sends is provided.
4. the rfid system of testing temperature as claimed in claim 3, it is characterised in that described electricity piezo-electric
Resistance conversion equipment includes:
One variable voltage is converted into variable-resistance device or a ditch type field effect transistor or field effect transistor
Equivalent circuit.
5. the rfid system of a testing temperature, it is characterised in that the rfid system bag of described testing temperature
Include: RFID reader, the first RFID label tag and the second RFID label tag, described first RFID label tag and
Described second RFID label tag has identical chip and antenna；Described first RFID label tag is placed on one
After fixed temperature levels lower a period of time, the first resonant frequency of the antenna of described first RFID label tag and letter
Number intensity keeps constant, and the most described first RFID label tag is operated under the first resonant frequency；Described second
RFID label tag is the RFID label tag with temperature sensitive device, and described temperature sensitive device is connected to described RFID label tag
On antenna, and form parallel-connection structure, wherein said first RFID label tag and described 2nd RFID with antenna
When the antenna of label is monopole antenna, described temperature sensitive device and the antenna of described second RFID label tag
Form parallel-connection structure；The antenna of described first RFID label tag and described second RFID label tag is quadripole
During antenna, described temperature sensitive device forms parallel-connection structure with an antenna of described second RFID label tag, or
Person and two antennas concurrently form parallel-connection structure；
The circuit that the chip of temperature sensitive device and the second RFID label tag connects has an electricity piezo-resistive conversion dress
Putting, the circuit of this connection and this electricity piezo-resistive conversion equipment are parts for chip, the change of ambient temperature
Change can cause temperature sensitive device both end voltage or the change of electric current, the most described second RFID label tag to be placed on one
After fixed temperature levels lower a period of time, characteristic frequency and the signal of the antenna of described second RFID label tag are strong
Degree at least has one and changes, and the most described second RFID label tag is operated under the second resonant frequency；
Described first RFID label tag and described second RFID label tag receive the finger that described RFID reader sends respectively
Order feedback signal, described RFID reader is by comparing from described first RFID label tag and described the
Difference between the signal intensity of two RFID label tag different frequencies detects the change of temperature；
Described temperature sensitive device is the temperature sensitive device of PN junction；
When the antenna of described second RFID label tag enters in the alternating magnetic field that RFID reader produces, described
Transformator is formed, with thinking temperature sensitive device between antenna and the antenna of RFID reader of the second RFID label tag
Energy source, the antenna of the second RFID label tag and the antenna of RFID reader is provided to be respectively at the beginning of transformator
Level coil and secondary coil, described temperature sensitive device will by the most interconnective electric charge pump and rectification circuit
The electromagnetic wave that the antenna of the second RFID label tag receives is converted to DC voltage, with thinking described 2nd RFID mark
Sign and the instruction offer energy source that described RFID reader sends is provided.
6. the rfid system of testing temperature as claimed in claim 5, it is characterised in that described electricity piezo-resistive
Conversion equipment includes: a variable voltage be converted into variable-resistance device or a ditch type field effect transistor or
The equivalent circuit of field effect transistor.
7. the method for the rfid system testing temperature of a testing temperature, it is characterised in that described method is applied
In the rfid system of testing temperature described in claim 1 or 2, or the RFID of testing temperature described in claim 3 or 4
System, or the rfid system of testing temperature described in claim 5 or 6, including:
After described first RFID label tag is placed on certain temperature levels lower a period of time, described first
First resonant frequency of the antenna of RFID label tag and signal intensity keep constant, the most described RFID
Labeling task is under the first resonant frequency:
After described second RFID label tag is placed on certain temperature levels lower a period of time, described second
The characteristic frequency of the antenna of RFID label tag and signal intensity at least have one and change, and the most described
Two RFID label tag are operated under the second resonant frequency；
Send instructions to described first RFID label tag by described RFID reader and described 2nd RFID marks
Sign and receive feedback signal；
Utilize more described first RFID label tag of described RFID reader and described second RFID label tag work
Time different frequency signal intensity between difference detect the change of temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183476.4A CN102693401B (en) | 2012-06-01 | 2012-06-01 | The rfid system of a kind of testing temperature and the method for testing temperature thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183476.4A CN102693401B (en) | 2012-06-01 | 2012-06-01 | The rfid system of a kind of testing temperature and the method for testing temperature thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102693401A CN102693401A (en) | 2012-09-26 |
| CN102693401B true CN102693401B (en) | 2016-08-03 |
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| CN201210183476.4A Expired - Fee Related CN102693401B (en) | 2012-06-01 | 2012-06-01 | The rfid system of a kind of testing temperature and the method for testing temperature thereof |
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| CN113610543B (en) * | 2021-08-05 | 2024-04-09 | 湖南国天电子科技有限公司 | Special equipment transferring method and system based on RFID technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201662822U (en) * | 2009-12-30 | 2010-12-01 | 上海真灼电子技术有限公司 | Semi-active RFID temperature measuring label |
| US20120031979A1 (en) * | 2010-08-09 | 2012-02-09 | Kang Hee-Bok | Rfid tag |
| CN202720066U (en) * | 2012-06-01 | 2013-02-06 | 北京物资学院 | RFID system for measuring temperature |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8228172B2 (en) * | 2008-09-30 | 2012-07-24 | Motorola Solutions, Inc. | RFID tag device with temperature sensitive antenna |
| US8931953B2 (en) * | 2010-05-27 | 2015-01-13 | The Hong Kong University Of Science And Technology | Low voltage low power CMOS temperature sensor circuit |
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2012
- 2012-06-01 CN CN201210183476.4A patent/CN102693401B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201662822U (en) * | 2009-12-30 | 2010-12-01 | 上海真灼电子技术有限公司 | Semi-active RFID temperature measuring label |
| US20120031979A1 (en) * | 2010-08-09 | 2012-02-09 | Kang Hee-Bok | Rfid tag |
| CN202720066U (en) * | 2012-06-01 | 2013-02-06 | 北京物资学院 | RFID system for measuring temperature |
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