可调谐F-P腔进行锥形光栅反射带宽解调的应力测量方法

理论分析和实验验证了通过对锥形光栅反射谱进行带宽解调来获得环境应力/应变的可行性,提出了对锥形光栅反射谱采用可调谐F-P腔进行带宽解调的方法,通过应力加载实验对该带宽解调方法进行了验证,并取得了较好的反射带宽解调和应力测量效果。实验证明,该测量系统实现了对温度变化不敏感的应力测量,同时具有较高的灵敏度,应力测量精度为0.060 N。在进一步进行锥形光栅中心反射波长解调的基础上,该方案可实现温度和应力的同时测量。

Measurement of temperature-insensitive strain based on reflected bandwidth demodulation of tapered fiber grating

A temperature-insensitive strain sensor is presented based on a tunable F-P interferometer to measure the bandwidth of the reflected light from tapered fiber grating(TFG) and the bandwidth demodulating method is demonstrated by a strain loading experiment.Experimental results indicate that the stress sensing system has a high delicacy and the precision of stress measurement is 0.060 N.This sensor has a considerable potential,particularly application for strain sensing in the smart structures.Based on the development of the interrogation system that can demodulate both bandwidth and center wavelength of the reflected light from TFG,a novel sensor that can measure strain and temperature simultaneously is presented.