Self-calibration detection device and temperature demodulation method for optical fiber Raman temperature sensing system

Abstract

The invention discloses a self-calibration detection device and a temperature demodulation method for an optical fiber Raman temperature sensing system; wherein, the self-calibration detection device includes an optical fiber Raman temperature detector, a constant temperature bath, a multi-mode sensing optical fiber and a multi-mode reflector; the fiber optic Raman thermometer includes a pulsed laser, the output of the pulsed laser is connected to the input of the WDM; the two output terminals of the WDM are respectively connected to the input of the first APD and the second APD; the output of the first APD The terminal is connected with the input terminal of the first LNA; the output terminal of the second APD is connected with the input terminal of the second LNA; the output terminal of the first LNA and the second LNA is connected with the input terminal of the data acquisition card; the output terminal of the data acquisition card Connect to the input terminal of the computer. The invention solves the problems of low temperature measurement accuracy, low temperature measurement stability and low temperature measurement efficiency of the system caused by the temperature demodulation method in the existing distributed optical fiber Raman temperature measurement system.

Description

technical field [0001] The invention relates to the field of temperature demodulation in a distributed optical fiber sensing system, in particular to a self-calibrating temperature detection device and a temperature demodulation method for an optical fiber Raman sensing system. Background technique [0002] Distributed optical fiber sensing technology uses the optical fiber itself as both a signal transmission medium and a sensing unit to obtain the distribution of external physical quantities of the entire optical fiber link. The distributed optical fiber sensing system has high measurement accuracy, long sensing distance, and good reliability. It has been widely used in the health monitoring of infrastructure such as smart grids. [0003] In the distributed optical fiber Raman temperature measurement system, the commonly used temperature demodulation method is to use Stokes backscattered light as the reference channel, use anti-Stokes backscattered light as the signal chan...

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Problems solved by technology

[0005] In order to solve the problem that the temperature measurement performance of the existing distributed optical fiber Raman sensing system drops sharply due to phenomena such as optical fiber dispersion, APD temperature drift, and optical fiber sudden bending, the present invention proposes a distributed optical fiber Raman temperature sensor System self-calibration detection device and temperature demodulation method

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