Hua Liwei, Song Yang, Huang Jie, Lan Xinwei, Li Yanjun, Xiao Hai
Appl Opt. 2015 Aug 20;54(24):7181-7. doi: 10.1364/AO.54.007181.
A Michelson-type large core optical fiber sensor has been developed, which is designed based on the optical carrier-based microwave interferometry technique, and fabricated by using two pieces of 200-μm diameter fused silica core fiber as two arms of the Michelson interferometer. The interference fringe pattern caused by the optical path difference of the two arms is interrogated in the microwave domain, where the fringe visibility of 40 dB has easily been obtained. The strain sensing at both room temperature and high temperatures has been demonstrated by using such a sensor. Experimental results show that this sensor has a linear response to the applied strain, and also has relatively low temperature-strain cross talk. The dopant-free quality of the fused silica fiber provides high possibility for the sensor to have promising strain sensing performance in a high temperature environment.
一种迈克耳孙型大芯径光纤传感器已被研制出来，它基于基于光载波的微波干涉测量技术进行设计，并通过使用两根直径为200μm的熔石英芯光纤作为迈克耳孙干涉仪的两臂来制造。由两臂光程差引起的干涉条纹图案在微波域中被检测，在该微波域中很容易获得40dB的条纹可见度。利用这种传感器展示了在室温及高温下的应变传感。实验结果表明，该传感器对应变施加具有线性响应，并且温度-应变串扰相对较低。熔石英光纤的无掺杂特性为该传感器在高温环境中具有良好的应变传感性能提供了很大可能性。
