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为实现光纤法布里-珀罗(F-P)腔初始腔长和腔长变化量在宽范围条件下的声振动传感解调,提出了基于双可调谐激光器的正交相位提取方法。理论计算了保持相位正交的光纤F-P腔初始腔长范围。仿真和实验研究了初始腔长漂移对信号解调的影响,实验通过改变温度实现了初始腔长0~2.2μm的漂移,在此情况下对干涉强度法和正交相位提取法解调结果进行了对比分析,正交相位提取法解调信号幅值相对变化小于5.3%,其稳定性比干涉强度法解调信号幅值稳定性提高了12.4倍。利用波长调谐补偿实现了传感器初始腔长范围55~130μm的覆盖,解调信号幅值相对变化小于4.9%。
In order to realize the acoustic vibration sensing demodulation over a wide range of initial cavity length and cavity length of fiber Fabry-Perot (F-P) cavity, a quadrature phase extraction method based on double tunable laser is proposed. The initial cavity length of fiber F-P cavity is calculated theoretically. The effects of initial cavity length drift on signal demodulation were simulated and experimentally studied. The initial cavity length was changed from 0 to 2.2 μm by changing the temperature. In this case, the results of the interference intensity method and the quadrature phase extraction method were demodulated In the comparative analysis, the relative amplitude of the demodulated signal by quadrature phase extraction is less than 5.3%, and its stability is 12.4 times higher than that of the interference intensity demodulated signal. The initial cavity length of the sensor is covered by the wavelength tuning compensation by 55 ~ 130μm. The relative amplitude of the demodulated signal is less than 4.9%.