CN1599196A - Electromagnetic energy self-power supply sensor - Google Patents
Electromagnetic energy self-power supply sensor Download PDFInfo
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- CN1599196A CN1599196A CNA2004100405998A CN200410040599A CN1599196A CN 1599196 A CN1599196 A CN 1599196A CN A2004100405998 A CNA2004100405998 A CN A2004100405998A CN 200410040599 A CN200410040599 A CN 200410040599A CN 1599196 A CN1599196 A CN 1599196A
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- 238000004146 energy storage Methods 0.000 description 6
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- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
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Abstract
本发明提供了一种电磁能自供电传感器，包括压电基片、天线，在压电基片上自左至右顺序制作单向叉指换能器、输出叉指换能器和反射栅，单向叉指换能器、输出叉指换能器和反射栅相互之间相隔一定间距，在单向叉指换能器与反射栅之间形成谐振腔，天线与单向叉指换能器联接，天线接收到的电磁能量沿天线、单向叉指换能器、输出叉指换能器单向传输，输出叉指换能器输出能量。本发明的优点是：对电磁能量进行最有效的储存和转化，还可人为发射电磁信号为传感器系统较远距离供电。特别是适合一些环境复杂，不易接触以及大型运动物体内部的参数测量。传感距离可提高若干个数量级，从而扩大应用的范围。
The invention provides an electromagnetic energy self-powered sensor, which includes a piezoelectric substrate and an antenna, on which a unidirectional interdigital transducer, an output interdigital transducer and a reflection grid are sequentially fabricated from left to right, and a single The direction interdigital transducer, the output interdigital transducer and the reflection grid are separated by a certain distance, and a resonant cavity is formed between the one-way interdigital transducer and the reflection grid, and the antenna is connected with the one-way interdigital transducer , the electromagnetic energy received by the antenna is unidirectionally transmitted along the antenna, the unidirectional IDT, and the output IDT, and the output IDT outputs energy. The invention has the advantages of: the most effective storage and conversion of electromagnetic energy, and the artificial emission of electromagnetic signals to supply power for a sensor system at a relatively long distance. It is especially suitable for the measurement of parameters in complex environments, difficult to access and inside large moving objects. The sensing distance can be increased by several orders of magnitude, thereby expanding the range of applications.
Description
Technical field
The present invention relates to a kind of transducer, especially relate to a kind of electromagnetic energy self-powered sensor.
Background technology
In recent years, along with making rapid progress of MEMS (micro electro mechanical system) research, various microminiaturizations, intellectuality and networked transducer obtain fast development.The electric energy supply mode of conventional sensor system (by extraneous physical connection or the mode that provides from charged pool) just constantly runs into challenge, even has a strong impact on the application and the development of modern intellectualized sensor, becomes the sensing technology development and one of bottleneck of using.For many application scenarios, necessary embedded material of intelligent miniature transducer or inside configuration, the output of signal and the supply of power supply become serious problem.In some occasion, the line between the replacing of battery and transducer and unit under test or even can't realize, for example, the permanent detection of biological intracorporeal organ and blood vessel state; The parameter measurement of many moving objects: the measurement of measurement, doughnut internal pressure, temperature and the friction of the most advanced and sophisticated acceleration of screw when the parameter testing of rotor, helicopter rotation; The demarcation of sensing in the intellectual material structural system and measurement, particle etc.Therefore, at present domestic and international many research institutions just are being devoted to study a kind of long-term, that can absorb ambient energy, brand-new self-powered sensor and are realizing permanent energy resource supply.
Solar energy and luminous energy are a more satisfactory external energy in the existing self-powered energy, the method that adopts opto-electronic conversion can be the power supply of transducer and instrument effectively, yet, its application is limited by environmental condition, light can not be applied to and many occasions can't be arrived, as, in opaque article inside.
Because the space electromagnetic wave is ubiquitous, and has the advantage that many other self energizing modes do not have, therefore, electromagnetic energy is the very promising self-powered energy of another kind.The electromagnetic excitation transducer is divided into two classes by the energy coupled modes: inductance coil coupled mode and day line style.
The passive sensor of inductance coil coupling energy supply and transponder can be used as sensing amount and identity monitoring, have been widely used in the Item Management and intelligentized traffic system on market, library, airport.Yet adopt electromagnetic coupled modes such as coil, energy mainly concentrates on the very near zone of hub of a spool, and the distance of its sensing is very near, and 1 meter distance has been distant coupling, and long range systems has been very rare more than 1 meter.
It line style transducer adopts the electromagnetic energy of antenna collection space, be converted into the energy of other form then efficiently through SAW (Surface Acoustic Wave) device, the measured size of its energy perception, then, modulated sensing amount is changed into the receiving system that electromagnetic energy sends to far-end efficiently by antenna, realize the sensing and the measurement of passive and wireless.Because the difference of power conversion mode, it has farther measuring distance than the transducer of inductance coupling high.
Abroad the research of passive and wireless transducer is started from eighties of last century the late nineteen eighties, domestic since the nineties middle and later periods in last century just to the exploration of passive and wireless transducer, obtained many progress and achievement in research at present, expand to many applications.At present, Passive Wireless SAW Sensors is as a kind of emerging transducer, show very tempting development potentiality, yet, in present passive and wireless transducer, no matter be mode of resonance or delay line type, energy all is coupled to output interdigital transducer (IDT) by antenna, change surface acoustic wave then, and reflect after same interdigital transducer is converted to electromagnetic wave and is launched by the same antenna through reflecting grating (or reflecting grating array), thereby still there is a problem of following several respects: 1, the piezoelectricity SAW (Surface Acoustic Wave) device itself is a passive device, and it need not the power supply power supply, but it does not have the gathering and the storage of energy, can't guarantee when being configured to the intellectualized sensor unit, the electric energy of work is provided for the semiconductor signal processing circuit, therefore, can not realizes having self diagnosis, from the passive and wireless intellectualized sensor of handling function; 2, the distance sensing of wireless senser is nearer, has only several meters farthest, has limited application; 3, because energy is very weak, the efficient of antenna requires very high, and when frequency was low, antenna size was too big, thereby can't put into structure.
Summary of the invention
At the problem of above-mentioned existence, the invention provides a kind of have energy-storage function, self-powered, self diagnosis, handle certainly, the microminiaturized multifunction electric magnetic energy of subminiaturized intellectuality self-powered sensor.This transducer has the resonant cavity of absorption, accumulation and stored antenna energy with surface acoustic wave unidirectional interdigital transducer group and reflecting grating (array) or unidirectional interdigital transducer (group) structure, be pooled on the SAW (Surface Acoustic Wave) device electromagnetic energy is the most effective, realized the electromagnetism self-powered of sensor strip energy storage, supplied with intelligent semiconductor chip and carry out data processing and signal emission.The present invention is realized by following scheme: a kind of electromagnetic energy self-powered sensor, comprise piezoelectric substrate, antenna, sequentially built unidirectional interdigital transducer from left to right on piezoelectric substrate, output interdigital transducer and reflecting grating, unidirectional interdigital transducer, output interdigital transducer and reflecting grating are each other mutually across a certain distance, between unidirectional interdigital transducer and reflecting grating, form resonant cavity, antenna connects with unidirectional interdigital transducer, the electromagnetic energy that antenna receives is along antenna, unidirectional interdigital transducer, the output interdigital transducer one-way transmission, output interdigital transducer output energy.
Advantage of the present invention is: effectively be pooled to the electromagnetic energy around the piezoelectric transducer on the antenna, and electromagnetic energy carried out the most effective storage and conversion, the external world without any electromagnetic particular surroundings in, also can artificially launch electromagnetic signal is that sensing system is than remote power-feeding.Because the arbitrariness of this sensor unit non-transformer, no line, distribution, use unrestrictedly, particularly be fit to some circumstance complications, the difficult contact and the parameter measurement of large-scale moving object inside.Distance sensing can improve the several number magnitude, thereby enlarges the scope of using.
Description of drawings
Fig. 1 is the structure chart of embodiment one;
Fig. 2 is the structure chart of embodiment two;
Fig. 3 is the structure chart of embodiment three;
Fig. 4 is the structure chart of embodiment three.
Embodiment
Embodiment one: as shown in Figure 1, a kind of electromagnetic energy self-powered sensor, comprise piezoelectric substrate 1, antenna 2, sequentially built unidirectional interdigital transducer 5 from left to right on piezoelectric substrate 1, output interdigital transducer 3 and reflecting grating 4, unidirectional interdigital transducer 5, output interdigital transducer 3 and reflecting grating 4 are each other mutually across a certain distance, between unidirectional interdigital transducer 5 and reflecting grating 4, form resonant cavity, antenna 2 connects with unidirectional interdigital transducer 5, the electromagnetic energy that antenna 2 receives is along antenna 2, unidirectional interdigital transducer 5, output interdigital transducer 3 one-way transmissions, output interdigital transducer 3 output energy.
Embodiment two: as shown in Figure 2, on the basis of embodiment one, unidirectional interdigital transducer 5 during for the interdigital transducer group of cascade effect better.
Embodiment three: as shown in Figure 3, a kind of electromagnetic energy self-powered sensor, comprise piezoelectric substrate 1, antenna 2, on piezoelectric substrate 1, make three unidirectional interdigital transducers 5 side by side, wherein, the certain spacing of being separated by between second and third two interdigital transducers 5 forms resonant cavity therebetween, antenna 2 connects with first unidirectional interdigital transducer 5, and second and third two unidirectional interdigital transducers, 5 parallel connections are also exported energy.
Embodiment four: as shown in Figure 4, on the basis of embodiment three, disconnect the parallel connection between second and third two unidirectional interdigital transducers 5, and increase an output interdigital transducer 3 betwixt, energy is by interdigital transducer 3 outputs.
In said structure, unidirectional interdigital transducer 5 is one of key that realizes above-mentioned functions with resonant cavity.Unidirectional interdigital transducer 5 has the effect of one-way transmission signal and energy, energy can only be from antenna 2 input SAW (Surface Acoustic Wave) device, and surface acoustic wave but can not reverse transfer arrive antenna 2, therefore, the energy that antenna 2 receives is with continuous resonance and accumulate in the resonant cavity, has formed energy storage efficiently.Owing to will organize unidirectional interdigital transducer cascade effect usefulness more, thereby guarantee the energy one-way transmission of antenna 2.
Because adopting absorption space electromagnetic energy is that system constantly powers, energy storage, therefore, under normal conditions, it need not under any power source situation, can for good and all be the intelligence sensor system service.In this sensing system, make full use of piezoelectric to electromagnetic peculiar dynamo-electric conversion characteristic, electromagnetic energy around the piezoelectric transducer effectively is pooled on the antenna, and electromagnetic energy is carried out the most effective storage and conversion, realize the electromagnetism self-powered of transducer.Because adopting absorption space electromagnetic energy mode is that system constantly powers, energy storage, therefore, under normal conditions, it need not any excitation can be the service of intelligence sensor system works chronically.The external world without any electromagnetic particular surroundings in, also can artificially launch electromagnetic signal is that sensing system is than remote power-feeding.
For transducing signal and portion of energy are taken out, in actual use, the utility model can an external control circuit, and this control circuit comprises power conversion, power supply energy storage and management circuit, coupling circuit, signal processing circuit, coding and radiating circuit.The electric energy of output be by the output of transducer with the surface wave vibration mechanical energy is efficient transform after, give electrical power storage, power management, signal processing and the radio transmitter of whole system through output control circuit.Owing to the input and output path separately, thereby realize that intake compiles and signal of telecommunication output is controlled, the surface acoustic wave vibration signal be transformed to the signal of telecommunication.
Claims (4)
1, a kind of electromagnetic energy self-powered sensor, comprise piezoelectric substrate (1), antenna (2), it is characterized in that: sequentially built unidirectional interdigital transducer (5) from left to right on piezoelectric substrate (1), output interdigital transducer (3) and reflecting grating (4), unidirectional interdigital transducer (5), output interdigital transducer (3) and reflecting grating (4) are each other mutually across a certain distance, between unidirectional interdigital transducer (5) and reflecting grating (4), form resonant cavity, antenna (2) connects with unidirectional interdigital transducer (5), the electromagnetic energy that antenna (2) receives is along antenna (2), unidirectional interdigital transducer (5), output interdigital transducer (3) one-way transmission, output interdigital transducer (3) output energy.
2, electromagnetic energy self-powered sensor according to claim 1 is characterized in that: described unidirectional interdigital transducer (5) is the interdigital transducer group of cascade.
3, a kind of electromagnetic energy self-powered sensor, comprise piezoelectric substrate (1), antenna (2), it is characterized in that: on piezoelectric substrate (1), make three unidirectional interdigital transducers (5) side by side, wherein, the certain spacing of being separated by between second and third two interdigital transducers (5), form resonant cavity therebetween, antenna (2) connects with first unidirectional interdigital transducer (5), and second and third two unidirectional interdigital transducers (5) parallel connection is also exported energy.
4, electromagnetic energy self-powered sensor according to claim 3, it is characterized in that: disconnect the parallel connection between second and third two unidirectional interdigital transducers (5), and increasing an output interdigital transducer (3) betwixt, energy is by interdigital transducer (3) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100405998A CN100355182C (en) | 2004-09-01 | 2004-09-01 | Electromagnetic energy self-power supply sensor |
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| CNB2004100405998A CN100355182C (en) | 2004-09-01 | 2004-09-01 | Electromagnetic energy self-power supply sensor |
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| CN1599196A true CN1599196A (en) | 2005-03-23 |
| CN100355182C CN100355182C (en) | 2007-12-12 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504445B (en) * | 2009-03-06 | 2011-04-13 | 华南理工大学 | Back-trough type structural magnetofluid-sonic surface wave integrated magnetic transducer |
| CN101504446B (en) * | 2009-03-06 | 2011-04-20 | 华南理工大学 | Thin film type structural magnetofluid-sonic surface wave integrated magnetic transducer |
| CN101594074B (en) * | 2009-06-30 | 2011-09-21 | 重庆大学 | Magnetostrictive and Piezoelectric Composite Array Magnetoelectric Transducer Using Multi-Concentrators |
| CN101577505B (en) * | 2009-06-16 | 2011-11-16 | 山东大学 | Spatial electromagnetic energy-based wireless sensor self-power supply system and spatial electromagnetic energy-based wireless sensor self-power supply method |
| CN106291411A (en) * | 2016-08-30 | 2017-01-04 | 哈尔滨工业大学深圳研究生院 | A kind of wireless and passive detection device in magnetic field |
| CN107005099A (en) * | 2014-09-11 | 2017-08-01 | Cpg技术有限责任公司 | Guided surface wave transmission at multiple frequencies in lossy media |
| CN107515336A (en) * | 2016-06-17 | 2017-12-26 | 南京理工大学 | A low power consumption resonant electric field sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4616197A (en) * | 1985-12-05 | 1986-10-07 | R. F. Monolithics, Inc. | Resonator |
| US4731595A (en) * | 1986-01-24 | 1988-03-15 | Rf Monolithics, Inc. | Resonator structure |
| WO1998027647A1 (en) * | 1996-12-18 | 1998-06-25 | Northern Telecom Limited | Surface wave device filters using resonant single phase unidirectional transducers |
-
2004
- 2004-09-01 CN CNB2004100405998A patent/CN100355182C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101504445B (en) * | 2009-03-06 | 2011-04-13 | 华南理工大学 | Back-trough type structural magnetofluid-sonic surface wave integrated magnetic transducer |
| CN101504446B (en) * | 2009-03-06 | 2011-04-20 | 华南理工大学 | Thin film type structural magnetofluid-sonic surface wave integrated magnetic transducer |
| CN101577505B (en) * | 2009-06-16 | 2011-11-16 | 山东大学 | Spatial electromagnetic energy-based wireless sensor self-power supply system and spatial electromagnetic energy-based wireless sensor self-power supply method |
| CN101594074B (en) * | 2009-06-30 | 2011-09-21 | 重庆大学 | Magnetostrictive and Piezoelectric Composite Array Magnetoelectric Transducer Using Multi-Concentrators |
| CN107005099A (en) * | 2014-09-11 | 2017-08-01 | Cpg技术有限责任公司 | Guided surface wave transmission at multiple frequencies in lossy media |
| CN107005099B (en) * | 2014-09-11 | 2020-04-24 | Cpg技术有限责任公司 | Guided surface wave transmission of multiple frequencies in a lossy medium |
| CN107515336A (en) * | 2016-06-17 | 2017-12-26 | 南京理工大学 | A low power consumption resonant electric field sensor |
| CN106291411A (en) * | 2016-08-30 | 2017-01-04 | 哈尔滨工业大学深圳研究生院 | A kind of wireless and passive detection device in magnetic field |
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| CN100355182C (en) | 2007-12-12 |
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