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基于拍频解调的光纤光栅位移传感器

Fiber Bragg Grating Displacement Sensor Based on Beat Frequency Demodulation

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摘要

为提高光纤光栅监测微小位移的灵敏度和精度,提出并实现一种基片式环形光纤光栅位移传感器,利用谐振腔中不同模式拍频信号的变化实现传感。Sagnac环形腔有效提升了抽运光源的利用率,同时拥有比直腔更小的相位噪声和更高的信噪比。该传感器采用应变片式结构,能够有效地对光纤进行保护,更加精确地测量由位移引起的频率变化。实验中每5 mm观察一次传感信号的漂移情况,重复实验的多组实验结果表明,该传感器频移与位移基本呈线性变化,线性拟合度高达0.9995,灵敏度为-45.4 kHz/mm,根据频谱仪的最高精度,可得传感器的测量精度为0.88×10 -3 mm,与理论推导基本一致。

Abstract

In order to improve the sensitivity and accuracy of fiber Bragg grating (FBG) monitoring micro-displacement, a substrate-based FBG displacement sensor is proposed and implemented. The sensing is realized based on beat-frequency signals of different modes in the resonator. The Sagnac ring cavity effectively improves the utilization of the pump light source, and has smaller phase noise and higher signal-to-noise ratio than the straight cavity. The substrate-based strain sensing structure can effectively protect the optical fiber and accurately measure the frequency variation caused by the displacement. In the experiment, the drift of the sensing signal is observed every 5 mm. The results of repeated experiments are recorded. The results show that the frequency shift varies linearly with the displacement, the degree of linear fit is up to 0.9995, and the sensitivity is -45.4 kHz/mm. According to the highest precision of the spectrometer, we obtain that the measurement accuracy of the sensor is 0.88×10 -3 mm, which is basically consistent with the theoretical derivation.

Newport宣传-MKS新实验室计划
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DOI:10.3788/LOP56.170622

所属栏目:功能光纤

基金项目:国家自然科学基金青年基金、中央高校基础科研经费;

收稿日期:2019-04-12

修改稿日期:2019-05-20

网络出版日期:2019-09-01

作者单位    点击查看

徐雨露:江南大学物联网工程学院, 江苏 无锡 214122
倪屹:江南大学物联网工程学院, 江苏 无锡 214122
余涛:江南大学物联网工程学院, 江苏 无锡 214122
郭瑜:江南大学物联网工程学院, 江苏 无锡 214122

联系人作者:倪屹(niy2011@163.com)

备注:国家自然科学基金青年基金、中央高校基础科研经费;

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引用该论文

Yulu Xu, Yi Ni, Tao Yu, Yu Guo. Fiber Bragg Grating Displacement Sensor Based on Beat Frequency Demodulation[J]. Laser & Optoelectronics Progress, 2019, 56(17): 170622

徐雨露, 倪屹, 余涛, 郭瑜. 基于拍频解调的光纤光栅位移传感器[J]. 激光与光电子学进展, 2019, 56(17): 170622

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