光通信技术2026，Vol.50Issue(2)：41-47,7.DOI:10.13921/j.cnki.issn1002-5561.2026.02.007
基于NLM的喇曼光时域反射温度降噪方法
NLM-based temperature denoising method for Raman optical time-domain reflectometry
摘要
Abstract
To achieve high-precision measurement of downhole temperature fields in oil and gas wells and address the low signal-to-noise ratio problem of Raman optical time-domain reflectometry over long distances,a temperature denoising method based on Non-Local Means(NLM)for Raman optical time-domain reflectometry is proposed.This method constructs tempera-ture images using two-dimensional spatial and temporal temperature data,evaluates similarity by calculating Euclidean dis-tances between image neighborhoods,and achieves weighted-average denoising.Experimental results show that at a measure-ment point of 9.68 km,the demodulation precision improved from 0.68 ℃ to 0.11 ℃,long-term temperature fluctuations de-crease from 1.4 ℃ to 0.55 ℃,and good real-time performance is maintained during continuous temperature measurements ranging from 30 ℃ to 90 ℃.关键词
分布式光纤传感/光时域反射/自发喇曼散射/温度测量/非局部均值Key words
distributed optical fiber sensing/optical time-domain reflectometry/spontaneous Raman scattering/temperature measurement/non-local means分类
信息技术与安全科学引用本文复制引用
田翔,张伟,张峰,刘远志,闫子恒,杜斌,何俊..基于NLM的喇曼光时域反射温度降噪方法[J].光通信技术,2026,50(2):41-47,7.基金项目
国家自然科学基金项目(62205225)资助 （62205225）
广东省自然科学基金项目(2021A1515110320)资助 （2021A1515110320）
中国海洋石油有限公司"十四五"重大科技项目(KJGG2021-0503)资助. （KJGG2021-0503）
