Wireless passive sonic surface wave mixed parameter measuring sensor and parameters analysis method

Abstract

The invention discloses a sound surface wave sensor which has a simple structure and can detect two physical quantities (such as temperature, pressure and strain, etc.) at the same time, as well as a method used in the parametric analysis of the physical quantity feedback signal detected by the sensor by means of the sound surface wave delay line theory. Compared with the prior sensor based on the same principle, the invention overcomes the disadvantages that the prior sound surface wave sensor can only detect a single physical quantity, or the prior sensor needs to adopt a relatively complex structure in order to detect two physical quantities. The invention can detect two physical quantities at the same time through making full use of the characteristic that the sound surface wave energy signal generated by an interdigital transducer can be transmitted in two directions at the same time. The sound surface wave sensor, which has a simple structure, has the outstanding characteristics of easy batch production and processing, a small volume, light weight and zero aging rate, etc.; theoretical analysis verifies that the sensor can ensure that the feedback signal of the two measured physical quantities can generate independent detection signal through data processing by means of a certain method.

Description

technical field [0001] The invention belongs to the technical field of surface acoustic wave sensing, and specifically relates to a wireless passive surface acoustic wave mixed parameter measurement sensor capable of simultaneously detecting the changes of two external physical quantities to be measured, and how to apply the acoustic sensor to the physical quantity feedback signal detected by the sensor. A method for parametric analysis of surface wave delay line theory. Background technique [0002] Due to the simple structure, small size, light weight, good stability, wireless connection, no power drive and high sensitivity of the surface acoustic wave sensor, it can be used in a variety of complex and harsh environments. Since the 1980s, the United States, Germany, Japan and other countries have extensively carried out research on surface acoustic wave wireless passive sensors. In published patents and technical documents, various methods of using surface acoustic wave de...

AI Technical Summary

Problems solved by technology

Although the structure of the surface acoustic wave sensor in the existing scheme 1 is simple, the sensor is only used to measure a single physical quantity, and two physical quantities cannot be measured simultaneously in one sensor; in the existing scheme 2, the sensor can measure two physical quantities simultaneously , but the structure of the sensor is too complex

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