论文部分内容阅读
相位漂移是干涉型光纤传感器实际应用中遇到的关键问题之一。提出了一种基于线性控制原理的无源解决方法,利用干涉仪的输出信号得到一个误差信号对光源波长进行调节,在非平衡干涉仪中产生一个补偿相位,对各种噪声引起的相位漂移进行补偿,从而使干涉仪一直工作在最灵敏的地方,实现了无源线性检测。搭建实验系统,利用该方法对某一干涉型光纤水听器进行了测试,结果表明该光纤水听器被很好地控制在正交工作状态,获得了稳定的输出信号。在20~2500 Hz频率范围内,该光纤水听器的声压灵敏度为-156.5 dB(0 dB=1 rad/μPa),频响波动<±1.2 dB,与采用相位载波(PGC)调制解调方法测得的结果一致,从而验证了该方法的可行性。
Phase shift is one of the key problems encountered in the practical application of interference optical fiber sensors. A passive control method based on linear control theory is proposed. An error signal is generated by the interferometer output signal to adjust the wavelength of the light source. A phase compensation is generated in the unbalanced interferometer. The phase shift caused by various noises is performed Compensation, so that the interferometer has been working in the most sensitive place, to achieve a passive linear detection. An experimental system was set up to test an interferometric fiber optic hydrophone using this method. The results show that the fiber hydrophone is well controlled in the orthogonal working state and a stable output signal is obtained. The sound pressure sensitivity of this fiber optic hydrophone is -156.5 dB (0 dB = 1 rad / μPa) with a frequency response variation of <± 1.2 dB over a frequency range of 20-2500 Hz, compared with a PGC modulation / demodulation The results of the method are consistent, which verifies the feasibility of the method.