适于高温压力管道表面应变监测的光纤光栅应变片技术研究

Technical Researching on Optical Fiber and Optical Grating Strain Gage Suitable for Supervising Surface Strain of High Temperature and Pressure Piping

为监测高温压力管道表面应变的快速变化,在制作耐300℃高温光纤光栅基础上,设计了1种适于高温环境下压力管道表面应变检测的光纤布拉格光栅应变片,该光纤光栅应变片选用3只聚酰亚胺涂覆层光纤布拉格光栅和高温恒弹合金基底,经高温粘接工艺进行封装,适用于压力管道二维表面高温应变检测。采用等强度悬臂梁方法,对封装好的高温光纤光栅应变片进行了高温性能和应变性能实验测试,验证了高温光纤光栅应变片的工作性能,给出了高温管道光纤光栅应变片监测系统的技术方案。

In order to supervise the rapid variation of surface strain for high temperature and pressure piping and based on preparing optical fiber and optical grating resisting high temperature of 300℃, a kind of optical fiber and Bragg optical grating strain gage was designed suitably for supervising the surface strain of pressure piping under high temperature environment , in this strain gage three optical fibers and Bragg optical gratings coated with polyim-ide with constantly elasting alloy primer resisting high temperature were selected , which were hermetically packaged via high temperature splicing process , it was suitable for the high temperature strain supervision on bi-dimensional surface of pressure piping.Experimental test on high teperature property and strain property were made for the hermetically packaged high temperature optical fiber and optical grating strain gage , the operating property of high tem-perature optical fiber and optical grating strain gage was certified , and the technical scheme for supervising system of optical fiber and optical grating strain gage resisting high temperature piping was supposed.