基于二维图像高斯滤波的BOTDR噪声抑制方法研究  

Research on BOTDR noise suppression method based on Two-dimensional image gaussian filter

作　　者：王静娴 白清 曲晓辉 王璇 郭泓宇 王宇[2,3] 靳宝全 WANG Jingxian;BAI Qing;QU Xiaohui;WANG Xuan;GUO Hongyu;WANG Yu;JIN Baoquan(Key Laboratory of Advanced Transducers and Inteligent Control System of Ministry of Education and shanxi Province,Taiyuan University of technology,Taiyuan 030024,China;College of Electronic Information and Optical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan 030024,China)

机构地区：[1]太原理工大学新型传感器与智能控制教育部与山西省重点实验室,山西太原030024 [2]太原理工大学电子信息与光学工程学院,山西太原030024 [3]山西省交通科技研发有限公司,山西太原030024

出　　处：《光学技术》2024年第5期513-519,共7页Optical Technique

基　　金：国家自然科学基金(61975142,62005190);山西省重点研发计划项目(202202130501004,202102130501021);中央引导地方科技发展资金项目(YDZJSX20231B004)。

摘　　要：布里渊光时域反射仪(BOTDR)因光信号单端注入及自发布里渊散射信号弱而导致布里渊增益谱(BGS)信噪比(SNR)较低,本文提出采用二维图像高斯滤波算法对BGS图像进行处理以实现对BOTDR系统的降噪。分析了微波外差扫频BOTDR的BGS噪声信号特征,设计了二维图像高斯滤波BGS降噪算法,并在BOTDR测温实验系统上实验验证了该降噪算法的噪声抑制效果和信号处理效率。实验证明,在单频功率曲线100次累加平均的条件下,采用高斯滤波算法对二维BGS图像降噪,降噪前后BGS的SNR提升约10.7dB,变温区的波动范围由±7.79MHz降低至±2.61MHz,同时有效传感距离由约13.8km提升至约24.0km,降噪算法平均信号处理时间约为0.129s。研究表明该降噪方法可显著提升BOTDR系统的SNR,且具有良好的实时性。Because the structure of Brillouin optical time domain reflectometer(BOTDR) is single-ended optical signal injection and the spontaneous Brillouin scattering signal is weak,signal-to-noise ratio(SNR) of the BGS is low.Two-dimensional(2D) image Gauss filtering algorithm is proposed to process BGS image to achieve noise reduction of BOTDR system.The noise signal characteristics of BGS acquired by BOTDR based on microwave heterodyne sweep method are analyzed,2D image Gaussian filter BGS noise reduction algorithm is designed,experiments are carried out on BOTDR temperature measurement system,and the experiment verifies the noise suppression effect and signal processing efficiency of the proposed algorithm.Experimental proof that under the condition of 100 cumulative averages of a single frequency power curve,Gaussian filter algorithm is used to reduce the noise of 2D BGS image,and the SNR of BGS is improved by about 10.7dB after noise reduction,the fluctuation range of BFS in the variable temperature zone is reduced from±7.79MHz to ±2.61MHz,at the same time,the effective sensing distance has been increased from about 13.8km to about 24.0km,the average signal processing time of noise reduction algorithm is about 0.129s.The results show that the method can significantly improve the SNR of BOTDR system and has good real-time performance.

关 键 词：分布式光纤传感 布里渊光时域反射仪 二维高斯滤波 噪声抑制 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]