基于区间段测量的分布式铠装光纤应变系数标定

Strain coefficient calibration of distributed armored optical fiber based on interval measurement

在工程测量时,分布式铠装光纤往往需要输入相应的应变系数进行监测,然而很多厂家并没有提供相关的参数。基于布里渊光时域分析的分布式传感系统原理,研制了一套铠装分布式光纤应变系数测量装置。该装置的创新性在于提出并实现了“区间标定法”,该方法规避了传统的光纤应变系数测量中夹具可能对光纤测试造成的干扰。应用所研发装置对两个厂家的铠装光纤应变系数进行测定试验,结果表明:相较于传统测试方法,区间标定法能够获得更为准确的测量结果。

In engineering measurement,it is necessary to input the corresponding strain coefficient of distributed armored optical fiber for engineering monitoring,but many manufactures do not provide relevant parameters.Based on the principle of distributed sensing system of Brillouin optical time domain analysis,a strain coefficient measuring device for distributed armored optical fiber was developed.Compared with the traditional measurement of optical fiber strain coefficient,the innovation of the device lies in proposing and realizing an interval calibration method,which avoids the interference caused by fixture during the process of stretching the fiber.In this paper,the developed device was used to measure the strain coefficient of armored optical fiber from two manufacturers.The research results show that the interval calibration method can obtain more accurate measurement results than traditional methods.