Temperature detection system based on multi-sensor recognition

Abstract

The present invention provides a multi-sensor recognition-based temperature detection system, which comprises a reader, a broadband antenna and N surface acoustic wave sensors, wherein each surface acoustic wave sensor comprises a one-way interdigital transducer and a frequency orthogonal reflection grating code group; the reader sends a query signal to the surface acoustic wave sensors via the broadband antenna; the surface acoustic wave sensors receive an orthogonal frequency coded signal and transforms the orthogonal frequency coded signal into a surface acoustic wave signal according to the trigger of the query signal; the reader receives an echo signal via the broadband antenna. The remote multipoint-connection anti-interference surface acoustic wave wireless sensors based on the combination of orthogonal frequency and code division multiplexing code is adopted, the near-far effect of a passive sensor system for code division multiplexing coding is solved, and demands of an intelligent power grid on the wireless monitoring on the temperature of power equipment are met.

Description

technical field [0001] The invention relates to the field of temperature monitoring of power equipment, in particular to a temperature detection system based on multi-sensor identification. Background technique [0002] Among the many monitoring quantities of power equipment status monitoring, temperature is one of the most critical detection quantities. Through temperature monitoring, the operating status and fault information of power equipment can be understood in a timely and accurate manner. Monitoring the operating temperature of power equipment, such as the oil temperature of transformers, and the conductor temperature of transmission lines (overhead lines and power cables) can be used to calculate the load limit capacity and equipment aging degree, thereby providing a basis for dynamic capacity increase or maintenance of power equipment. Monitor the temperature of the stator and rotor of the generator, high-voltage switchgear, busbar joints, outdoor knife switch, ci...

AI Technical Summary

Problems solved by technology

[0005] However, the currently developed SAW wireless sensor array cannot fully meet the temperature monitoring requirements in smart grid and UHV applications, and the problems mainly include:

[0006] Problem 1: The working distance is not enough

[0007] Problem 2: The number of temperature points detected at the same time is not enough

[0008] Question 3: The anti-interference performance of the sensor needs to be improved

However, due to the limitation of the applicable wireless bandwidth and the length of the SAW substrate material, it is difficult to realize 8 types of piezoelectric substrates on a 10 mm long piezoelectric substrate (which is the limit, and the SAW propagation loss and diffraction loss will be unacceptably large any longer). The above sensor types

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