用于多点测试的全光纤速度干涉仪研究

基于时分复用（TDM）原理，提出了一种新型的用于多点速度测试的全光纤干涉系统，通过同一个冲击靶面的测速实验验证方案的可行性。该系统通过在原有全光纤速度干涉仪（AFVI）的探测端口引入光纤耦合器和延迟线，由于延时的存在，被测点干涉信号之间在时间上存在相同的延时，利用时分复用原理，能够实现以往需要多套速度干涉仪才能实现的对测试靶面的多点测试功能。通过对同一个测试自由面上的两点进行测试，得到了具有一定时延的相似干涉条纹，而且延迟的时间与光纤延迟线对应。实验验证了系统设计的正确性。

All-Fiber Velocity Interferometer for Multipoint Measurement

By using time division and multiplexing (TDM) method, a novel system of all-fiber velocity interferometer (AFVI) is constructed to achieve multipoint velocity measurement and experimentally demonstrated by velocity test on the same shocked target. With the couplers and fiber delay line added at the test ports of all-fiber velocity interferometer, a temporal delay between two different points is achieved and can be used as the time intervals in the TDM systems. Multipoint-measuring task can be carried out by this new configuration, though it is usually done by several interferometers. A two-point velocity measurement experiment of the same shocked target is done by using the system. By comparison of the two-point interference fringes, it is shown that there exists an time interval between the two similar interferometric signal which just equals the time delay caused by the fiber delay line T. So the systems correctness can be demonstrated.