基于Lissajous图形的光纤分布式扰动传感器定位方法

Novel extended lissajous figure based location method for fiberoptic distributed disturbance sensor

研究了一种基于Lissajous图形的光纤分布式扰动传感器定位方法。光纤分布式扰动传感器基于Mach-Zehnder干涉仪，通过两路输出信号的时延得到扰动定位。在两路输出信号的Lissajous图形中构造拟合椭圆，基于实验数据的仿真研究表明：通过椭圆半短轴长可以得到时延，实现定位。法进行了仿真和实验研究，在无需噪声抑制的条件下定位精度较高：在信噪比为-6~7dB范围，最大定位误差为207 m 多次测量中，最大误差为94 m。研究结论可以为光纤分布式扰动传感器定位方法提供新的技术参考。

A location method based on the extended Lissajous figure was proposed for fiber-opticdistributed disturbance sensor based on Mach-Zehnder interferometer. The disturbance was located by thefiber-optic distributed disturbance sensor due to the time delay between the two signals from clockwiseand counter- clockwise Mach-Zehnder interferometer. In the Lissajous figure of the two signals, a fittingellipse with constant semimajor and azimuths was induced to evaluate the time delay. The relationshipbetween the time delay and semiminor of the ellipse was obtained by linear fitting. Then, the time delaycould be calculated by the semiminor of the fitting ellipse. By the simulation with experimental data andexperimental test, it is found that the proposed lower location errors can be obtained by the locationmethod than current cross correlation function based method without phase generation carrier technique.