光学精密工程2024，Vol.32Issue(17)：2645-2653,9.DOI:10.37188/OPE.20243217.2645
单光路拉曼分布式光纤测温系统
Single optical channel based Raman distributed optical fiber temperature measurement system
摘要
Abstract
To address the issue of position correction and temperature distortion caused by walk-off effects in conventional Raman distributed optical fiber temperature measurement systems,a new single optical channel scheme is proposed.This scheme incorporates a model for scattered light power correction and a temperature calibration algorithm to ensure accurate temperature measurement along the fiber.First,tem-perature demodulation formulas for single Raman Stokes and anti-Stokes light are derived based on the temperature sensitivity principle of Raman scattering.Since temperature demodulation via a single optical channel is hindered by the stability of pulse lasers and photodetectors,a temperature calibration unit and signal power correction algorithm are developed.An experimental platform was then built to compare the temperature measurement performance of traditional dual-channel systems with single channel Raman Stokes and Raman anti-Stokes schemes.Experiments on a 12 km fiber demonstrated that the scheme using Raman anti-Stokes light achieves a temperature deviation of-0.3℃to 2.2℃,with a root mean square er-ror of 1.0℃and a spatial resolution of 6 m,showing superior performance over traditional systems.This single channel system with signal power correction offers high sensitivity and eliminates the walk-off cor-rection issue inherent in dual-channel systems,proving its practical value.关键词
光纤传感/拉曼散射/测温/光时域反射/分布式Key words
optical fiber sensor/Raman scattering/temperature measurement/optical time domain re-flecting/distributed分类
电子信息工程引用本文复制引用
冯玉祥,刘志凯,黄闽南,王一山,吕立冬..单光路拉曼分布式光纤测温系统[J].光学精密工程,2024,32(17):2645-2653,9.基金项目
国家自然科学基金资助项目(No.51977001) （No.51977001）
