研制了一种探针型的萨格纳克型光纤振动传感器, 利用贝塞尔函数递推公式推导了振幅的测量算法。传感器使用980nm激光通过掺饵光纤泵浦出的1550nm的宽光谱光源, 利用振动源在光纤环中产生的非互易相位调制, 在输出端获得干涉信号。利用传感器对频率为8.1kHz到11.3kHz的振源进行了测量, 实验数据与仿真分析一致, 频率测量误差不超过0.6%, 振幅测量数据的离散程度较小。

A probe type optical fiber vibration sensor based on Sagnac effect is developed, and the amplitude measurement algorithm is deduced by using the recursive formula of Bessel function. The sensor uses 980nm laser through a wide spectrum light source erbium doped fiber pumped by 1550nm, to obtain the interference signal at the output generated by the optical fiber ring in the Sagnac effect. The sensor is used to measure the vibration source with frequencies from 8.1 kHz to 11.3 kHz, the experimental data are consistent with the simulation analysis. The error of frequency measurement is less than 0.6%, and the discreteness of amplitude measurement data is small.