Ultra-long distance low-power temperature monitoring sensor

Abstract

The invention provides an ultra-long distance low-power temperature monitoring sensor, which comprises a unidirectional interdigital transducer and an orthogonal frequency reflection grating chip group, wherein the orthogonal frequency reflection grating chip group comprises n chips which are sequentially arranged; the n chips form a sensor code; each chip is formed by a periodic electrode to formreflection of an orthogonal sub-frequency; the sub-frequencies among multiple chips are orthogonal to one another; and the length of the time domain of each chip reflection signal is kept consistentto meet the orthogonality conditions. The invention further provides a corresponding system. According to a long-distance multi-connection and anti-interference surface acoustic wave sensor method provided by the invention, the ''near-far effect'' of a sensor system employing code division multiplexing coding is avoided, the power consumption is reduced, and meanwhile, the requirements of an intelligent power grid on temperature monitoring of power equipment can be met.

Description

technical field [0001] The invention relates to the field of temperature monitoring of power equipment, in particular to a sensor and system for ultra-long distance and low power consumption temperature monitoring. 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 expansion or maintenance and updating of power equipment. Monitor the temperature of the stator and rotor of the generator, high-voltage switchgear, ...

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 piezoelectric substrate with a length of 10 mm (it is already the limit, and the propagation loss and diffraction loss of SAW will be unacceptably large if it is longer). The above sensor types

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