Temperature measuring device and method based on Raman light reflection

Abstract

The invention relates to temperature measuring device and method based on Raman light reflection, wherein the method comprises the following steps of: injecting pulsed laser into an optical fiber by a laser device, carrying out isolation filtering on the reflected light subjected to optical fiber reflection to obtain Stokes and anti-Stokes light, and entering an analog-to-digital conversion module for sampling the two beams of light subjected to photoelectric conversion and amplification; sending the sampled data into an FPGA (Field-Programmable Gate Array) for real-time accumulative filtering, and entering an embedded processor by a filtered electric signal; comparing the received electric signal with the electric signal input by an electronic temperature measurement sensor by the embedded processor to obtain the temperature of the reflected light; and carrying out parameter self-adaptive optimization on a temperature demodulation formula through the positions and the temperature values of four electronic temperature sensors. The device has the characteristics that the filtering equisignal processing has extremely high speed, the temperature distortion is small, and the system has a self-adaptive function for environments, thereby improving the reliability of the system.

Description

technical field [0001] The invention relates to a temperature measuring device and method based on Raman light reflection, which is mainly used for long-distance real-time temperature measurement. Background technique [0002] Optical fiber technology is a new technology that has developed rapidly in the past 20 years. Distributed optical fiber sensing technology is a bright spot in the current application of optical fiber in industrial detection. Temperature detection based on Raman reflection, the amplitude of the reflected Raman light and the external temperature There is a more obvious relationship between the height and the low. The position information at a certain temperature can be measured by the return time of the reflected light. In this way, the temperature and position information can be obtained by continuously collecting the amplitude of the reflected light. [0003] Among the Raman-based retroreflected light in the time domain, both anti-Stokes (AN-STROKES)...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the disadvantages of previous distributed temperature measuring instruments, such as large volume, incapable of self-adaptive calibration, and slow response time, the present invention provides a temperature measuring device that saves the constant temperature tank and micro-chassis, and the volume is greatly reduced. The temperature measured by an additional electronic temperature sensor nearby is used as a reference, the parameter calibration is performed automatically, the filtering signal processing speed is fast, and the temperature distortion is small. The temperature measurement device and method based on Raman light reflection

Images