CN203606038U - Surface-acoustic-wave temperature-sensing responder - Google Patents
Surface-acoustic-wave temperature-sensing responder Download PDFInfo
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- CN203606038U CN203606038U CN201320625502.4U CN201320625502U CN203606038U CN 203606038 U CN203606038 U CN 203606038U CN 201320625502 U CN201320625502 U CN 201320625502U CN 203606038 U CN203606038 U CN 203606038U
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 77
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- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a surface-acoustic-wave temperature-sensing responder, and the responder employs two surface acoustic wave resonators with the same frequency band, wherein one is a resonator which is sensitive to temperature, and the other one is a reference resonator which is not sensitive to temperature. The resonant frequency is out of the change range of resonant frequency of the resonator which is sensitive to temperature. The two resonators are connected to the same antenna through a matching network. The double-resonator temperature-sensing responder irons out the defects that the echo frequency of a conventional single-resonator temperature-sensing responder is relative to a reading distance and high frequency precision measurement is high in requirement.
Description
Technical field
The utility model belongs to surface acoustic wave sensor, particularly, is a kind of SAW (Surface Acoustic Wave) resonator type temperature sensing transponder.
Background technology
The metal electrode structure such as the interdigital transducer that SAW (Surface Acoustic Wave) resonator utilization is made on piezoelectric substrate and cycle reflecting grating array form surface acoustic wave resonance chamber, realize the passive electronic components of electricity resonance based on (contrary) piezoelectric effect, in modern electronic technology field, be used widely.
Because the natural resonance frequency of SAW (Surface Acoustic Wave) resonator can be produced faint variation (Fig. 1) by ambient temperature effect of living in, its amplitude of variation depends primarily on piezoelectric substrate temperature characterisitic.Detect this frequency change and just can know the change of environment temperature by inference, SAW (Surface Acoustic Wave) resonator has the temperature sensing function of the accurate digital signal of output.
Due to the interdigital transducer of SAW (Surface Acoustic Wave) device, can directly connect antenna, transmitting/receiving wireless electric wave, has radio communication function, so SAW (Surface Acoustic Wave) resonator is the simplest wireless and passive temperature sensor.
Surface acoustic wave wireless temperature sensor system, survey mechanism based on uhf electromagnetic wave backscattering, adopt SAW (Surface Acoustic Wave) resonator as temperature-sensing element (device), there is small passive and round-the-clock application characteristic, can be applied to the civil area such as intelligent grid, food security, realize networking Real-Time Monitoring relevant environment temperature, will in following Internet of Things development, bring into play its unique effect.
Wireless temperature sensing system based on SAW (Surface Acoustic Wave) resonator forms (Fig. 2) by transponder and reader.Reader is a radar class of electronic devices, and transponder only forms (Fig. 3) by SAW (Surface Acoustic Wave) resonator and antenna encapsulation, and wherein inductance effect is coupling and anti-tampering.System Working Principle is as follows: reader is initiatively launched an excitation carrier wave pulse, transponder antenna receives rear feed to SAW (Surface Acoustic Wave) resonator, make it produce forced oscillation, and beam back driving pulse response echo (Fig. 4 left part waveform), store electromagnetic wave energy simultaneously in SAW (Surface Acoustic Wave) resonator.After driving pulse has been launched, the SAW (Surface Acoustic Wave) resonator of transponder will outwards be launched the electromagnetic wave energy of its storage with its natural resonance frequency, forms resonator sensing response echo (Fig. 4 right part waveform).Transponder sensing response echo is the amplitude modulation high-frequency signal of an amplitude fading, because this echo high frequency frequency is the inherent feature of SAW (Surface Acoustic Wave) resonator influenced by ambient temperature, carry the impact of environment temperature parameter, so reader can obtain environment temperature parameter instantaneous value through processing after receiving echo, completes environment temperature wireless sensing function to be measured.
Monophone surface resonator type temperature sensor is applied in the strong interference environments such as electrical network now, because needs are directly measured radio-frequency echo wave frequency, requires high to reader frequency measuring technique.
Find in addition the impact due to communication link, adopt the transponder of single resonator, echo frequency can change (Fig. 5) with reading distance is different, as while being applied in mobile reading, can make sensing accuracy greatly reduce, even may cause wireless sensing function to lose.
Summary of the invention
As aforementioned, the wireless temperature sensing system of existing monophone surface resonator, has two deficiencies: the one, and mobile application has problem, and the 2nd, the high frequency frequency test precision of requirement transponder is high.For this reason, this patent proposition employing alliteration surface resonator composition wireless sensing transponder is good technical scheme (Fig. 6).
A kind of SAW (Surface Acoustic Wave) resonator type temperature sensing transponder, it is characterized in that: adopt two with frequency range SAW (Surface Acoustic Wave) resonator, one is responsive to temperature resonator, and another is temperature-resistant benchmark resonator, and its resonance frequency is outside the variation range of responsive to temperature resonator resonance frequency.
A kind of SAW (Surface Acoustic Wave) resonator type temperature sensing transponder, is characterized in that: described two resonators are connected to same antenna by matching network.
Sensing response echo, is the synthetic of two SAW (Surface Acoustic Wave) resonator resonance frequencies, contains its difference frequency signal.Because the benchmark resonator resonance frequency in two resonators is not to environment temperature sensitivity, difference frequency changing value is exactly the relative variation of responsive to temperature resonator resonance frequency, i.e. the tolerance of transponder environment temperature of living in.Measure this difference frequency, just complete temperature wireless remote measurement, measuring technique requires to reduce many.
Because temperature sensing information is that difference frequency signal is entrained, and two resonator electrical impedance characteristicses are consistent, so the impact of wireless link has been offset completely.
So the invention solves the deficiency of existing single resonance type temperature sensing transponder.
Accompanying drawing explanation
The temperature characterisitic of SAW (Surface Acoustic Wave) resonator resonance frequency for Fig. 1 temperature detection.
Fig. 2 acoustic surface wave temperature sensing system.
The existing monophone surface resonator of Fig. 3 type temperature sensing transponder circuit.
Fig. 4 acoustic surface wave temperature sensing system transponder echo.
The relation of Fig. 5 monophone surface resonator type temperature sensing transponder resonance frequency and reader distance.
Fig. 6 the present invention: alliteration surface resonator type temperature sensing transponder.
The signal of Fig. 7 SAW (Surface Acoustic Wave) resonator.
Fig. 8 has the frequency temperature curve of the responsive SAW (Surface Acoustic Wave) resonator of quartz temperature of negative temperature coefficient.
Fig. 9 has the frequency temperature curve of the responsive SAW (Surface Acoustic Wave) resonator of quartz temperature of positive temperature coefficient (PTC).
Figure 10 resonator LC matching network.
Figure 11 resonator LC matching effect.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 6, for the circuit of alliteration surface resonator type temperature sensing transponder of the present invention, first feature of the present invention is: adopt two with frequency range SAW (Surface Acoustic Wave) resonator, one is responsive to temperature resonator, and another is temperature-resistant benchmark resonator, its resonance frequency is outside the variation range of responsive to temperature resonator resonance frequency.
The metal electrode structure such as interdigital transducer (IDT) and cycle reflecting grating array (reverberator) that SAW (Surface Acoustic Wave) resonator (Fig. 7) utilization is made on piezoelectric substrate forms surface acoustic wave resonance chamber, realize the passive electronic components of electricity resonance based on (contrary) piezoelectric effect, in modern electronic technology field, be used widely.
The piezoelectric substrate of making at present SAW (Surface Acoustic Wave) resonator is mainly the monocrystalline such as quartz, lithium niobate and lithium tantalate, be all aeolotropic crystal material, tangentially different with its cut type, its material behavior has larger difference, for example quartz, its frequency-temperature coefficient can be in ± 50 ppm/K range.Select the tangential piezoelectric substrate of suitable cut type, can meet application requirements.
Fig. 8 is the resonance frequency temperature characterisitic with the responsive SAW (Surface Acoustic Wave) resonator of quartz temperature of negative frequency temperature coefficient (21.4 ppm/K), and Fig. 9 is the resonance frequency temperature characterisitic with the responsive SAW (Surface Acoustic Wave) resonator of quartz temperature of positive frequency temperature coefficient (22 ppm/K).
Meticulously select quartz substrate and device technology, a frequency-temperature coefficient of commercialization quartz saw resonator is zero, and secondary temperature coefficient is only 0.02 ppm/K
2, in surface acoustic wave oscillatory circuit, to be used widely, this patent adopts the benchmark resonator of this type of resonator as transponder.
The radio band that wireless telemetering equipment uses, Shi Shou various countries strict supervision, be generally 434MHz, 868MHz, the frequency ranges such as 915MHz and 2.45GHz.
A specific embodiments has adopted 434MHz frequency range, and temperature test scope is (40 ℃ ~ 80 ℃).Wherein to have adopted positive frequency temperature coefficient be the quartz resonator of 22 ppm/K to responsive to temperature resonator, and room temperature (20 ℃) resonance frequency is 434.1MHz, and responsive to temperature scope is (433.5MHz ~ 434.7MHz) 1.2MHz altogether.Therefore the room temperature resonance frequency of desirable benchmark resonator is 433.3MHz, room temperature difference frequency 0.8MHz, maximum difference frequency 1.4MHz, minimum difference frequency 0.2MHz.
Sensing response echo, is the synthetic of two SAW (Surface Acoustic Wave) resonator resonance frequencies, contains its difference frequency signal.Because the benchmark resonator resonance frequency in two resonators is not to environment temperature sensitivity, difference frequency changing value is exactly responsive to temperature resonator resonance frequency relative variation, i.e. the tolerance of transponder environment temperature of living in.Measure this difference frequency, just complete temperature wireless remote measurement, measuring technique requires to reduce many.
Further feature of the present invention is: described two resonators are connected to same antenna by matching network.
In double resonator sensing transponder, two resonators and antenna are all in parallel, and it is larger that the impedance of SAW (Surface Acoustic Wave) resonator and antenna impedance generally differ, and adopting matching network is useful to the sensing response of balance resonator characteristics and maximization sensory package.
Single inductance SAW (Surface Acoustic Wave) device matching network now, matching effect is poor.Dual-element Γ type match network topologies can have four kinds: two electric capacity, two inductance and inductance capacitance, but take the configuration of the serial capacitors shown in Figure 10 inductance as excellent, because shunt inductance can also play device protective effect.Figure 11 is that SAW (Surface Acoustic Wave) resonator adopts S11 Performance Ratio before and after LC dual-element coupling, illustrates that matching effect is obvious.
Although the present invention with preferred embodiment openly as above; but drawings and Examples are not for limiting the present invention, be anyly familiar with this skill person, without departing from the spirit and scope of the invention; can make various changes or retouch from working as, but equally within protection scope of the present invention.Therefore protection scope of the present invention should with the application claims were defined is as the criterion.
Claims (1)
1. a surface acoustic wave temperature sensing transponder, it is characterized in that: adopt two with frequency range SAW (Surface Acoustic Wave) resonator, one is responsive to temperature resonator, and another is temperature-resistant benchmark resonator, and its resonance frequency is outside the variation range of responsive to temperature resonator resonance frequency; Described two are connected to same antenna with frequency range SAW (Surface Acoustic Wave) resonator by matching network;
The interdigital transducer that described SAW (Surface Acoustic Wave) resonator utilization is made on piezoelectric substrate and cycle reflecting grating array metal electrode structure form surface acoustic wave resonance chamber;
In double resonator sensing transponder, two resonators and antenna are all in parallel.
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| CN201320625502.4U CN203606038U (en) | 2013-10-11 | 2013-10-11 | Surface-acoustic-wave temperature-sensing responder |
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| CN201320625502.4U CN203606038U (en) | 2013-10-11 | 2013-10-11 | Surface-acoustic-wave temperature-sensing responder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092080A (en) * | 2015-03-03 | 2015-11-25 | 重庆感知沃德科技发展有限公司 | Novel frequency sweep algorithm applied to surface acoustic wave wireless passive temperature measurement system |
| CN105427570A (en) * | 2015-12-29 | 2016-03-23 | 中电科技德清华莹电子有限公司 | Passive and wireless telemetering interface chip for general reactance-type sensing element |
| CN106979830A (en) * | 2017-04-28 | 2017-07-25 | 徐艺玮 | Chipless RFID temperature threshold sensor, production method and temperature alarming device |
| CN107289883A (en) * | 2017-07-25 | 2017-10-24 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave strain transducer of differential type resonator type |
| CN112964384A (en) * | 2021-03-16 | 2021-06-15 | 山东深思智能科技有限公司 | Resonator type wireless passive temperature sensor and working method |
-
2013
- 2013-10-11 CN CN201320625502.4U patent/CN203606038U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092080A (en) * | 2015-03-03 | 2015-11-25 | 重庆感知沃德科技发展有限公司 | Novel frequency sweep algorithm applied to surface acoustic wave wireless passive temperature measurement system |
| CN105092080B (en) * | 2015-03-03 | 2018-01-05 | 重庆感知沃德科技发展有限公司 | A kind of new Method of Sweeping Algorithm applied in the passive temp measuring system of surface acoustic wave wireless |
| CN105427570A (en) * | 2015-12-29 | 2016-03-23 | 中电科技德清华莹电子有限公司 | Passive and wireless telemetering interface chip for general reactance-type sensing element |
| CN106979830A (en) * | 2017-04-28 | 2017-07-25 | 徐艺玮 | Chipless RFID temperature threshold sensor, production method and temperature alarming device |
| CN107289883A (en) * | 2017-07-25 | 2017-10-24 | 中国科学院声学研究所 | A kind of wireless passive sonic surface wave strain transducer of differential type resonator type |
| CN112964384A (en) * | 2021-03-16 | 2021-06-15 | 山东深思智能科技有限公司 | Resonator type wireless passive temperature sensor and working method |
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