光纤光栅海洋温度传感器的快速响应特性

摘要

For the requirement of fast-response temperature of expendable ocean sensor, a new design scheme of optic fiber sensor was presented. Metal materials of different thermal expansion coefficients and the same tube structure with inner diameterd= 0.55 mm, lengthL = 9 mm were used for packaging FBG along the axis of a metal tube. And the temperature characteristics of the encapsulated Fiber Bragg grating (FBG) were experimentally studied. The theoretical calculation, simulation and the tests of the fast response properties were also described and analyzed in detail. The experimental results show that, the response time of the single-ended FBG packaged by a stainless tube is 47.1 ms, and the response time of the double-ended FBG packaged by a copper tube is 48.6 ms, which has increased by an order of magnitude than that of an ordinary optical fiber temperature sensor.%针对海洋投弃式仪器快速响应的测温要求，本文提出一种新型的光纤温度传感器设计方案。采用热膨胀系数不同的内径r=0.55 mm,长度L=9 mm的金属管式结构对布拉格光纤光栅(FBG，Fiber Bragg Grating)进行同轴封装，并通过实验对封装后光栅的温度特性进行了研究，详细描述和分析了关于响应时间的理论计算、仿真模拟和测试实验。实验结果表明，不锈钢管单端封装的响应时间是47.1 ms，紫铜管双端封装的响应时间是48.6 ms，比普通光纤温度传感器的响应时间提高了一个数量级。