一种新型干涉型光纤传感器模拟运算锁相系统的设计与实验

采用锁相系统抑制外界扰动对传感系统的影响,对干涉型光纤传感器锁相系统的设计方案从自动控制理论出发进行了理论分析.理论分析表明,锁相系统应包括两个积分环节以达到最好的锁相效果.实验结果显示,理论与实验结果吻合,该锁相系统可以成功地抑制外界扰动,一阶锁相系统输出的方差为31 mV,二阶系统输出的方差为3.5 mV,系统稳定性提高了1个数量级.

Design and Experiment of a Novel Analogue Phase Locked System for Interferometric Fiber Sensors

A phase locked system is employed to inhibit the effect of disturbance on the interferometric fiber sensors(IFS).The phase locked system is analyzed based on automatic control technology.The theoretical analysis shows that two integrity components are necessary to achieve the best phase-lock effect.The experimental results show that the phase locked system could inhibit the disturbance effectively,and consist with the theoretical analysis.Furthermore,a practical phase locked 2-order system is demonstrated and its output variance is about 3.5 mV while that of the 1-order system is 31 mV.The stability of the system has been improved by 1 order of magnitude.