光纤传感器闭环工作点控制检测方法的改进

Improvement on Signal Detection Technique of Controlling the Working-Point by Closed-Loop of Fiber-Optic Sensors

闭环工作点控制是干涉型光纤传感器的一种简单有效的信号检测方法。在传统闭环工作点控制检测方法的基础上,对信号解调算法进行了改进,从而扩大了系统的动态范围,并提高了检测的速度和精度。对新算法的解调误差进行了详细的理论分析与仿真,得出了最大可检测信号与工作点允许变化的范围相互制约的结论。为了验证新算法,搭建了简单的Mach-Zehnder干涉仪系统,并编写了实时的数据采集与处理程序,对压电陶瓷(PZT)调制器产生的模拟信号进行了检测。实验结果证实了该算法的有效性。

The signal detection technique to control the working-point by dosed-loop is an effective method of interfemmetric fiber-optic sensors. The arithmetic of signal demodlation is improved based on the traditional method,which achieves the wider dynamic range,the bigger speed of detection and the higher precision of demodulation. The demodulation error is analyzed and simulated theoretically. The conclusion is that the measurable amplitude of the dynamic phase change and the permitted varying range of the working-point restrict each other. To validate the improved arithmetic, a simple Macb-Zehnder interferometer is designed. The experimental results have proved its correctness.