一种耐高温分布式光纤应变传感器的试验研究

Experimental Study on a Distributed Fiber Optic Strain Sensor with High Temperature Resistance

为实现高温压力管道的长距离监测,设计了一种耐高温分布式光纤应变传感器。该传感器通过采用变刚度设计来增强与管道的协同变形能力,从而提高对高温压力管道的表面应变测试精度。采用拉伸台与加热台组合方式对该传感器的耐高温性能进行了测试,并采用等强度梁对其传感性能和安装工艺进行了研究。结果表明:该传感器具有良好的耐高温性能,可以承受300℃的高温;采取焊接与电焊+环氧树脂的安装方式均可以使传感器达到较好的测试效果,与理论计算值的结果相比,最大误差为1.66%。

In order to realize long-distance monitoring of high temperature pressure pipelines, a distributed fiber optic strain sensor with high temperature resistance was designed. A variable stiffness design is adopted by the sensor to enhance the ability of co-deformation with the pipeline, so as to improve the accuracy of surface strain measurement of high temperature pressure pipeline. The high temperature resistance of the sensor was tested by the combination of drawing table and heating table, and the sensing performance and installation technology of the sensor were studied by the equal strength beam. The results show that the sensor has good high temperature resistance and can withstand the high temperature of 300 ℃. Both welding and welding with epoxy resin installation methods can make the sensor achieve good test results. Compared with the theoretical calculation results, the maximum error is 1.66%.