高温大应变光纤传感器性能劣化观测与失效机理分析

Performance degradation observation and failure mechanism analysis of high temperature and large strain optical fiber sensor

为了进一步优化和改进光纤传感器的固定方式,设计了一种金属焊片式非本征型法布里-珀罗(F-P)光纤传感器,并对其进行了实验观测。研究分析了在1200℃高温环境下不同焊接固定方式的F-P光纤传感器的失效机理。对在1200℃高温下失效的实验样件进行了观测与分析,利用有限元分析方法对实验样件进行仿真和计算,并结合实际的光谱信号变化来研究其具体的失效过程,结果表明不同的焊接固定方式会对传感器产生不相同的力学影响,从而影响传感器的寿命。

In order to further optimize and improve the fixed mode of optical fiber sensor, an extrinsic Fabry-Perot(F-P) optical fiber sensor with metal solder chip is designed and experimentally observed. The failure mechanism of F-P optical fiber sensor with different welding fixed mode at 1200 ℃ high temperature is studied and analyzed. The experimental samples that failed under 1200 ℃ high temperature are observed and analyzed. The finite element analysis method is used to simulate and calculate the experimental samples and the actual spectral signal changes are combined to study the specific failure process. The result show that different welding fixed mode will have different mechanical effects on the sensor, which will affect the life of the sensor.