布里渊分布式传感的空间分辨率及标定方法  

Spatial resolution and its calibration method for Brillouin scattering based distributed sensors

作　　者：崔何亮[1,2] 张丹[1] 施斌[1] 

机构地区：[1]南京大学地球科学与工程学院,江苏南京210093 [2]国家电力监管委员会大坝安全监察中心,浙江杭州310014

出　　处：《浙江大学学报（工学版）》2013年第7期1232-1237,1245,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金青年科学基金资助项目(40702045);国家"973"重点基础研究发展规划资助项目(2011CB710605);中央高校基本科研业务费专项资金资助项目(1116020605)

摘　　要：针对基于布里渊散射原理的分布式光纤传感技术的重要参数之一——空间分辨率,通过分析定荷拉伸试验的结果,对比2种不同空间分辨率下实测的定点拉伸光纤的应变分布,说明了空间分辨率对测量结果的影响,探讨标定空间分辨率的10%～90%温度台阶法和温度热点法及其适用性.提出异种光纤串法,即将2种不同峰值频率的光纤、按不同长度交替熔接而成的光纤串,通过分析光纤串的测量结果对空间分辨率进行标定.试验表明,与温度台阶法和温度热点法相比,异种光纤串法具有准确、客观、测试结果的可对比性强等特点.Spatial resolution is one of the important parameters for Brillouin scattering based distributed op- tical fiber sensing. The results of constant tensile load test were analyzed, and the strain distributions of point-by-point fixed fiber measured by two different spatial resolution respectively were compared. Then the influence of spatial resolution on measured strain was analyzed. Two spatial resolution calibration methods, including 10% ~90% step-function method and hot-spot method, and their applicability were discussed. The dissimilar-fiber-splicing method was proposed to calibrate the spatial resolution. Dissimilar- fiber-splicing means two variant peak frequency fibers are alternately spliced in series with segments of dif- ferent length. The calibration experiment shows that dissimilar-fiber-splicing method is accurate, objec- tive, and comparative.

关 键 词：空间分辨率 标定 异种光纤串法 分布式光纤传感 BOTDR BOTDA 布里渊 

分 类 号：O437.2[机械工程—光学工程] TN253[理学—光学]