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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。
Based on the principle of time division multiplexing (TDM), a new type of all-fiber interferometer system for multi-point speed testing is proposed. The feasibility of the scheme is verified by the same speed-measuring experiment on the target surface. The system introduces the fiber coupler and the delay line at the detection port of the original all-fiber speed interferometer (AFVI). Because of the delay, the same delay exists between the interference signals of the measured points in time, and the time division multiplexing Principle, to achieve the previous multi-speed interferometer can be achieved on the test target multi-point test capabilities. By testing two points on the same test free surface, similar interference fringes with a certain delay are obtained, and the delay time corresponds to the fiber delay line. The experiment verifies the correctness of the system design.