布里渊谱信号的提升方法研究  

Study on Improved Method of Brillouin Spectrum Signal

作　　者：袁明 李立功[1,2] 张洋 闫继送[1,2] 张志辉 YUAN Ming;Li Li-gong;ZHANG Yang;YAN Ji-song;ZHANG Zhi-hui(China Electronics Technology Instruments Co.,Lid.,Qingdao 266555,China;The 41st Research Institute of China Electronics Technology Group Corporation,Qingdao 266555,China)

机构地区：[1]中电科仪器仪表有限公司,山东青岛266555 [2]中国电子科技集团公司第四十一研究所,山东青岛266555

出　　处：《红外》2019年第5期28-31,共4页Infrared

基　　金：泰山产业领军人才工程专项

摘　　要：在布里渊光时域反射计(Brillouin Optical Time Domain Reflectometer,BOTDR)光纤传感系统中,自发布里渊后向散射信号非常微弱,尤其是光纤远端的布里渊散射信号,信噪比非常差,分析难度非常高。提出了一种基于互相关理论的布里渊谱信号质量提升方法,通过与理想布里渊散射谱进行互相关运算,降低了对光纤远端极微弱布里渊散射信号应变分析的难度。经试验验证,该方法可以有效提升信噪比较差时应变分布数据的信号质量以及BOTDR的应变传感精度。In the Brillouin optical time domain reflectometer (BOTDR) fiberoptic sensing system,the scattering signal from Brillouin back scattering is very weak,especially the Brillouin scattering signal at the far end of the fiber,the signal-to-noise ratio is very poor and is very difficult to analyze. A method of improvng Brillouin signal quality based on cross- correlation theory was presented. Through cross- correlation with ideal Brillouin scatering spectrum,the dificulty of strain analysis for very weak Brilouin scatering signal at the far end of optical fiber was reduced. It was verified by experiments that this method can effectively improve the signal quality of strain distribution data and the strain sensing accuracy of BOTDR when the signal-to-noise ratio is poor.

关 键 词：分布式光纤传感 应变系数标定 光纤拉伸装置 布里渊光时域反射计 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]