全光纤速度干涉仪数据处理方法

Data processing of an all-fiber velocity interferometer system for any reflector

准确地从试验数据计算输出信号相位差、振幅比及基线位置是 AFVISAR 数据处理程序所要解决的一项关键问题。通过对 AFVISAR 输出信号利萨如图形的深入研究,提出了一种自动拟合数据处理参数的算法。在借鉴传统速度干涉仪(VISAR)数据处理方法的基础之上,开发了AFVISAR 数据处理程序。运用该程序对 Hopkinson 压杆加载下的试验数据进行了处理,实测自由面速度的上升前沿和阻抗匹配法得到的结果相当一致。实测的速度最大值为 12.8m/s,与理论值13m/s 非常接近,表明该处理程序可以准确地、自动地拟合 AFVISAR 输出信号参数。

Through analyzing Lissajous figure of the output signals from All-Fiber Velocity Interferometer System for Any Reflector (AFVISAR), a new algorithm has been brought forward to fit parameters by means of least square method automatically. On the basis of VISAR data processing method, a data processing program for AFVISAR has been designed. The program is applied to the processing of the experimental data under loading of Hopkinson Bar. The practically measured velocity is 12.8 m/s, which is close to that (13 m/s) calculated with impedance matching method. In addition, the velocity profile calculated by the program is also consistent well with the result calculated by impedance matching method, which shows that the program can fit AFVISAR signal parameters accurately and automatically.