基于再生光纤光栅的高温传感器工程化封装技术

Engineering packaging technology of high-temperature sensor based on regenerated fiber Bragg grating

针对再生光纤光栅在高温场中机械强度降低,不耐烧蚀等实际问题,开展了再生光纤光栅(RFBG)高温传感器的工程化封装技术研究,提出了一种应用刚玉管的双层管式无应力耐高温工程化封装结构,该结构可通过调整固定法兰机械尺寸实现对高温热电偶传感器的兼容替换。通过850℃高温退火得到了再生光纤光栅高温传感器,并对其进行标定。结果表明:使用该结构封装的光纤光栅,经高温退火后,光纤光栅保护良好,产生再生现象,得到的再生光纤光栅高温传感器升温过程的灵敏度为0.0150 nm·℃^(-1),降温过程的灵敏度为0.0148 nm·℃^(-1)。

In view of the situation of the reduced mechanical strength and ablation resistance of the regeneration fiber Bragg grating(RFBG)under a high-temperature environment,the engineering packaging technology of RFBG was studied and a double layer tubular stress-free engineering packaging structure which can resistant high-temperature was proposed in this paper.This structure can realize the compatible replacement of the high temperature thermocouple sensor by adjusting the mechanical size of the fixed flange.A high-temperature regenerated fiber Bragg grating temperature sensor was obtained and calibrated by high temperature annealing at 850℃.The results show that the fiber Bragg grating encapsulated with this structure is well protected after high temperature annealing,and regeneration occurs.The obtained regenerated fiber Bragg grating high temperature sensor has a sensitivity of 0.0150 nm·℃^(-1)in the heating process and 0.0148 nm·℃^(-1)in the cooling process.