Temperature detection method based on passive wireless surface acoustic wave temperature sensor

Abstract

The invention is suitable for the field of power passive wireless temperature detection and provides a temperature detection method based on a passive wireless surface acoustic wave temperature sensor. According to the embodiment of the invention, in an operating frequency range of the passive wireless surface acoustic wave temperature sensor, a detection device sequentially emits a plurality of radio frequency signals with the same power and different frequencies to the passive wireless surface acoustic wave temperature sensor in a form of frequency sweeping and receives radio frequency signals fed back from the sensor, a phase difference between a feedback signal and an emitting signal is detected after filtration and amplification, an emitting frequency fm corresponding to the maximum phase different break variable delta phi is found, and a temperature is calculated according to the emitting frequency fm. Meanwhile, a power of the feedback signal is detected, the saturation degree of the sensor is analyzed according to the power of the feedback signal, and the power of the radio frequency signals emitted in the next detection process is automatically regulated, so that the sensor works in the best state, and has a strong environment self-adaptation capacity.

Description

technical field [0001] The invention relates to the field of electric passive wireless temperature measurement, in particular to a temperature detection method based on a passive wireless surface acoustic wave temperature sensor. Background technique [0002] In the high-voltage equipment of the power system, the high-voltage switchgear contacts, high-voltage busbar connectors, circuit breaker connectors, buried cables and other electrical equipment will age or generate heat due to excessive contact resistance during long-term operation, and the heat will accelerate to report to the equipment. The aging or contact resistance further increases, leading to aggravated heating, thus entering a vicious circle, and finally easily causing damage to the equipment. With the development of cities and the construction of smart grids, temperature monitoring of high-voltage voltage equipment is becoming more and more important. [0003] At present, the existing temperature measurement t...

AI Technical Summary

Problems solved by technology

[0009] The main purpose of the present invention is to provide a new temperature detection method based on a passive wireless surface acoustic wave temperature sensor, which solves the problems of excessive dependence on the sensor feedback signal strength, weak anti-interference ability, and poor environmental self-adaptive ability in the detection process, and improves Wireless temperature measurement distance, improve the reliability of temperature detection and environmental adaptability

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