光学学报, 2011, 31 (4): 0406006, 网络出版: 2011-04-01   

基于光纤光栅法布里珀罗腔锁频原理的高灵敏度光纤振动传感器 下载: 549次

Highly Sensitive Fiber-Optic Vibration Sensor Based on Frequency-Locking of a FBG Fabry-Perot Cavity
作者单位
浙江大学光电系现代光学仪器国家重点实验室, 浙江 杭州 310027
摘要
基于Pound-Drever-Hall (PDH)激光锁频原理,研制了一种高灵敏度的光纤振动传感器。该传感器采用光纤光栅法布里珀罗(F-P)腔作为传感头,将振动信号所引起的光纤光栅F-P腔透射峰位移信号转换成对应的误差信号进行探测。实验测试结果表明此系统对1~5 kHz频率范围内的振动信号传感性能优良,信噪比大于50 dB。综合考虑系统元器件参数及各种环境影响因素,从理论上对系统进行了分析,得出系统最小分辨率为11.7×10-12 strain/Hz,优于目前的典型光纤振动传感系统。
Abstract
A highly sensitive fiber-optic vibration sensor is developed based on the Pound-Drever-Hall (PDH) frequency locking scheme of a fiber Bragg grating (FBG) Fabry-Perot (F-P) cavity. It measures the vibration signal by the error signal transferred and amplified from the phase change of the F-P cavity. The sensor system exhibits experimentally a nice sensing capability to the vibration signals within a frequency range from 1 to 5 kHz and it can obtain a more than 50dB signal to noise ratio. The analysis of the sensor, taking into account the parameters of elements used in the system and many environment factors, shows that it may reach a resolution as high as 11.7×10-12 strain/Hz, which is much better than those of the traditional fiber sensing systems.

张乐, 吴波, 叶雯, 沈永行. 基于光纤光栅法布里珀罗腔锁频原理的高灵敏度光纤振动传感器[J]. 光学学报, 2011, 31(4): 0406006. Zhang Le, Wu Bo, Ye Wen, Shen Yonghang. Highly Sensitive Fiber-Optic Vibration Sensor Based on Frequency-Locking of a FBG Fabry-Perot Cavity[J]. Acta Optica Sinica, 2011, 31(4): 0406006.

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