Temperature measurement system and method based on fiber grating sensing

Abstract

The invention discloses a temperature measurement system based on fiber grating sensing. The temperature measurement system comprises a laser, a temperature measurement point positioning system, a synchronous trigger, a wavelength division multiplexer, a dual-channel APD (Avalanche Photo Diode) detector, an amplifying circuit, a data acquisition card, an industrial personal computer and a data display; a pulse light signal sent by the laser is coupled to sensor fiber through the wavelength division multiplexer, the sensor fiber is arranged in a temperature field to be measured by the temperature measurement point positioning system; the dual-channel APD detector is connected with the amplifying circuit; the amplifying circuit is connected with the data acquisition card; then the data acquisition card transmits data to the industrial personal computer; finally, a temperature measurement result is displayed by the data display. According to the temperature measurement system and the temperature measurement method, the cable temperature is measured through distributed fiber grating by adopting a Raman scattering principle, the system SNR (Signal to Noise Ratio) is improved and the measurement precision of the system is improved. Distributed temperature measurement along the optical fiber is realized and important reference is provided for the application of a distributed fiber temperature measurement technology in online monitoring of the cable temperature.

Description

technical field [0001] The invention relates to an optical fiber temperature measurement system, in particular to a temperature measurement system based on optical fiber grating sensing. Background technique [0002] Power cables are widely used in transmission lines, but because the cables will heat up due to overload and other reasons during work, which will deteriorate their insulation performance, and then develop into insulation breakdown and even fire, so online monitoring of their temperature is of great significance. Compared with other sensors, optical fiber has a series of advantages such as anti-electromagnetic, high temperature resistance, sensitivity to external changes such as temperature and strain, and low price. Therefore, distributed optical fiber temperature measurement technology based on optical fiber sensor technology has received widespread attention. Perfection has become one of the most promising temperature measurement technologies; at present, the ...

AI Technical Summary

Problems solved by technology

Compared with other sensors, optical fiber has a series of advantages such as anti-electromagnetic, high temperature resistance, sensitivity to external changes such as temperature and strain, and low price. Therefore, distributed optical fiber temperature measurement technology based on optical fiber sensor technology has received widespread attention. Perfection has become one of the most promising temperature measurement technologies; the current distributed optical fiber temperature measurement system still has insufficient measurement accuracy and the system cannot better adapt to a wide range of industrial control field environments

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