基于锥形光栅反射带宽解调的应变测量方法

A Strain Sensing Method Based on the Measurement of the Reflected Bandwidth from Tapered Fiber Grating

针对普通光纤布拉格光栅(FBG)传感器固有的交叉敏感问题,研究了采用锥形光纤光栅(TFG)实现的温度不敏感的应力/应变测量方法,提出了对TFG进行反射谱带宽解调以获得环境应力/应变的方法。实验表明,该方法可实现分布式测量,测量结果不受发源波动的影响,具有较高的精度和稳定性。

We demonstrate the feasibility to make a temperature-independent strain sensor by measuring the bandwidth of the reflected light from the tapered fiber grating（TFG）. This simple and low-cost sensor approach has a considerable potential, particularly application to strain sensing in the smart structures. The experirnetal results show that the method is suitable for distribution measurement,and it can restrain the influeace of source fluctuation.