基于酒精选择性填充光子晶体光纤的Sagnac应变传感器

Optic-Fiber Sagnac Strain Sensor Based on Alcohol Selectively-Filling Photonic Crystal Fiber

提出了一种基于酒精选择性填充光子晶体光纤的新型Sagnac光纤环应变传感器,实现了对微小应变的高灵敏度测量.利用酒精对光子晶体光纤的选择性填充使之产生双折射效应,并将已经填充好的光子晶体光纤嵌入到Sagnac干涉环中,实现了Sagnac干涉效应.当给光子晶体光纤施加应变时,Sagnac干涉谱的波峰会随着应变变化而变化,实现对应变的测量.实验结果表明,当微应变在0-3 958时,测量微应变的灵敏度能够达到3.66 pm.同时,本结构具有高灵敏度、高稳定性、抗电磁干扰、易于搭建等优点.

A newoptic-fiber Sagnac strain sensor based on alcohol filling photonic crystal fiber was proposed and demonstrated,by which measuring the minute strain could be achieved. The birefringence of the photonic crystal fiber（ PCF） was produced by alcohol selectively-filling the air holes of the PCF. And then the alcohol selectively-filling photonic crystal fiber was embedded in the Sagnac loop and the Sagnac interference effect was achieved. Then the peak wavelength of the Sagnac interference spectrum could be changed by strain because the peak wavelength shift was directly proportion to strain change. The micro strain sensitivity is measured to be 3. 66 pm in a micro strain range from 0 to 3 958.