布里渊频移响应特性及其灵敏度调制方法研究  

Study on Temperature/Strain Sensitivity of Optical Fiber Based on Brillouin Frequency Shift

作　　者：章晓燕[1] 曾捷[1] 周鹏[1] 石庆华[2] 梁大开[1] 张倩昀[1] 周雅斌[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,江苏南京210016 [2]中国航空工业集团北京航空制造工程研究所,北京100024

出　　处：《压电与声光》2014年第5期730-734,738,共6页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51275239);国家自然科学基金国际交流基金资助项目(51161120326);江苏省科技支撑计划基金资助项目(BE2011181);航空科学基金资助项目(20125652055);江苏高校优势学科建设工程资基金助项目;高等学校博士学科点专项科研基金资助项目(20123218110003)

摘　　要：为研究基于布里渊光时域反射测量原理的分布式传感光纤在工程应用中的温度和应变交叉敏感问题,首先采用介质中声学声子非弹性光散射理论,建立了布里渊频移与光纤所受应变和温度的理论关系模型,并数值模拟了纤芯材料属性与内置调制膜层参数对光纤布里渊频移应变、温度灵敏度的影响,得到当纤芯折射率增大、纤芯泊松比减小或内置调制膜层与裸纤间隙增大时,布里渊频移应变和温度灵敏度均减小;而当纤芯折射率、纤芯弹性模量减小或内置调制膜层热膨胀系数增大时,布里渊频移应变和温度灵敏度均增大。在此基础上搭建了布里渊散射测量系统,并选择了同时具备温度增敏与应变减敏特性的内置调制膜层型分布式光纤进行验证试验,试验结果与仿真分析一致。Theory of acoustic phonon inelastic light scattering medium was used to study the cross sensitivity of temperature and strain in engineering application of distributed optic fiber sensor based on BOTDR. The theoretical relation model for Brillouin frequency shift with temperature and stress fiber was established. Numerical simulation showed that when the core refractive index increased, the Poisson＇s ratio decreased or the built in modulation layer increased, and the Brillouin frequency shift temperature and strain sensitivity decreased; when the core refractive index and the core Poisson＇s ratio both decreased or the thermal expansion coefficient of built-in modulation layer increased, the Brillouin frequency shift temperature and strain sensitivity increased. Based on this, experimental test system for Brillouin scattering measurement was constructed, and the built-in modulation layer distritmted fiber was tested with temperature sensitization and strain desensitization. Experiment result showed good consistency with simulation analysis.

关 键 词：光学测量 布里渊频移 纤芯属性 内置调制膜层 灵敏度 

分 类 号：TM201.43[一般工业技术—材料科学与工程] TE973.6[电气工程—电工理论与新技术]