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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1～5kHz频率范围内的振动信号传感性能优良,信噪比大于50dB。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/槡Hz,优于目前的典型光纤振动传感系统。
Based on the principle of Pound-Drever-Hall (PDH) laser locking, a highly sensitive optical fiber vibration sensor was developed. The sensor uses fiber grating Fabry-Perot (F-P) cavity as the sensor head, the vibration signal caused by F-P fiber grating transmission peak displacement signal is converted to the corresponding error signal detection. Experimental results show that this system has excellent performance of vibration signal sensing in the frequency range of 1 ~ 5kHz with SNR greater than 50dB. Considering the parameters of the system components and various environmental factors, the system is theoretically analyzed. The minimum resolution of the system is 11.7 × 10-12 strain / 槡 Hz, which is better than the current typical fiber optic vibration sensing system.