Surface Acoustic Wave Delayed Reflection Wireless Sensor System with Anti-collision Function

Abstract

The invention provides a surface acoustic wave delayed reflection type wireless sensor system having the anti-collision function. A sensor chip of a transducer is composed of an encoded interdigital transducer (related transducer), and the codes of the encoded interdigital transducer are in the form of compatible codes of the same group. Transducers provided with chips that are encoded by the same compatible code are regarded as transducers of the same kind. At least two same-frequency short reflecting gratings are arranged on the sensor chip of the transducer along the direction of sound channels. The initial delay distance between first reflecting gratings on the chips of the transducers of the same kind and on associated transducers are different from each other, and the distance between every two reflecting gratings is the same. The above distances are designed in such a manner that all echo wave crests can be distinguished by a reader after the superimposition process of electromagnetic echo waves simultaneously generated by the transducers of the same kind within the testing range of nominal sensing values, so that the source and the sensing information thereof can be known. The reader comprises an encoding part having compatible codes and a reflected echo wave receiving part. The anti-collision capacity of the system is equal to the result of the type number of different transducers multiplied by the timing capacity.

Description

【Technical field】 [0001] The invention relates to a surface acoustic wave wireless sensor, in particular to a surface acoustic wave delayed reflection wireless sensor system with an anti-collision function. 【Background technique】 [0002] Real-time monitoring of the temperature of power grid equipment is the basic means of smart grid, and the market demand is urgent. Due to the special environment of the power grid, conventional temperature sensors cannot be applied, and the use of surface acoustic wave wireless sensor telemetry technology is an internationally recognized better solution. [0003] The surface acoustic wave (Surface Acoustic Wave, SAW) wireless sensor based on the radar principle developed in recent years does not require an external power supply, has strong anti-interference ability, and can be used in various harsh environments (such as high temperature, strong electromagnetic interference and nuclear radiation, etc.) It works reliably and is a supplement ...

AI Technical Summary

Problems solved by technology

[0020] Using software algorithms to expand the anti-collision function of surface acoustic wave sensors, although progress has been made, the practical prospects are uncertain

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