Surface acoustic wave resonant pressure sensor

A pressure sensor, surface acoustic wave technology, applied in the direction of measuring fluid pressure, measuring fluid pressure through electromagnetic components, instruments, etc., can solve the problems of low stability, poor reliability, low precision, etc., to improve repeatability and shorten lead wires , the effect of reducing interference
CN101865747AInactive Publication Date: 2010-10-20西安高科电气科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
西安高科电气科技有限公司
Publication Date
2010-10-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a surface acoustic wave resonant pressure sensor, which comprises two resonators, two low-noise singlechip integrated amplifiers, a double balanced mixer and an LC low pass filter. The two resonators are respectively connected to feedback circuits of the amplifiers to form a oscillator wither certain output frequency; and two paths of output frequency are subjected to mixing, lowpass filtering and amplification to obtain difference frequency output corresponding to external applied pressure one to one. The surface acoustic wave resonant pressure sensor can automatically measure medium pressure, overcome the defects of low accuracy, poor reliability and low stability in the prior art, and has the miniaturization and digital measurement function.
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Description

Technical field

[0001] The invention belongs to the field of electronic information, and relates to a miniaturized, digitalized high-performance, intelligent sensor capable of automatically measuring medium pressure. Background technique

[0002] The surface acoustic wave resonant pressure sensor is for the technical needs of the aviation, aerospace and other fields to automatically and accurately measure the pressure of the medium. At present, most of the pressure sensors produced in China are analog output, which must be connected with the microcomputer measurement and control system through A / D conversion, and the structure is relatively complicated. The main problem is the pressure sensor with analog output. Summary of the invention

[0003] In order to overcome the disadvantages of low precision, poor reliability, and low stability in the prior art, the present invention provides a surface acoustic wave resonance pressure sensor, which can automatically and accurately measur...

Claims

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