Self-numbering surface acoustic wave (SAW) passive and wireless resonance type sensor
A surface acoustic wave and resonator technology, which is applied in the field of surface acoustic wave (SAW) passive wireless resonant sensors, can solve the problems of device manufacturing engineering capability limitation and test accuracy drop, and achieve the effect of simple structure and improved test accuracy
Active Publication Date: 2014-11-12
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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Problems solved by technology
[0012] The use of numbered SAW sensors can solve the problem that due to the limitation of device process engineering capabilities, the basic value of the resonant frequency of the actual SAW sensor is quite different from its nominal value, resulting in a decrease in test accuracy.
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[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] figure 1 It is a schematic diagram of the self-numbering SAW passive wireless resonant sensor of the present invention, and the sensor adopts multiple SAW resonators connected in parallel. One of them is the reference resonator, which adopts a design with less sensitive characteristics of sensing quantity, and its resonant frequency f0 is called the reference frequency of the SAW sensor. The remaining N SAW resonators are called sensitive resonators, and their resonant frequency is called the sensitive frequency of the SAW sensor. At least one sensitive resonator corresponds to a sensing quantity to be measured, and they are respectively designed to have A structure with apparent sensitive properties.
[0027] All SAW resonators are directly connected to the sensor's small antenna through a matching network.
[0028] Differe...
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The invention discloses a self-numbering surface acoustic wave (SAW) passive and wireless resonance type sensor (SAW sensor); a plurality of SAW resonators are connected in parallel, wherein one resonator is a reference resonator; and a design with smaller sensitive character of sensing quantity is adopted. Other SAW resonators are sensitive resonators, at least one sensitive resonator corresponds to one sensing quantity to be measured, and the resonators are respectively designed into structures with significant sensitive characteristics to the sensing quantity to be measured. Within a regulated working frequency band, the tolerance interval group of the resonance frequency of all the SAW resonators is set through a frequency division method, and all the intervals do not coincide. The SAW sensors are combined and numbered through frequency intervals, and the total numbers are equal to the product of the numbers of all frequency intervals. The SAW passive and wireless resonance type sensor is a self-numbering sensor, maintains the advantages of general frequency difference structure SAW sensors, the numbers of the sensors can be identified by roughly estimating the resonance frequency of all the resonators in the sensors, the actual parameters of the sensors are quoted, so that the sensing quantity testing precision can be greatly improved.
Description
technical field [0001] The present invention relates to wireless sensors for the Internet of Things, especially surface acoustic wave (SAW) passive wireless resonant sensors (SAW sensors). technical background [0002] The surface acoustic wave (SAW) sensor uses the sensitivity of the transducer structure such as the piezoelectric chip and the interdigital transducer on it to the external environmental parameter stress, and tests its electrical characteristics to obtain the environmental parameter value, which has been applied in many fields . [0003] The rise of the Internet of Things has drawn attention to wireless sensors. Due to the characteristics of SAW devices that do not require external energy, their interdigital transducers can be directly connected to antennas to send and receive radio frequency radio waves, and can work in harsh environments, passive wireless SAW sensors have become a national research and development. focus. [0004] SAW passive wireless sens...
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IPC IPC(8): G01D5/48G01K11/26
Inventor 陈培杕周宗闽朱卫俊何朝峰周羚
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD