全光纤白光任意反射面速度干涉系统

对离散任意反射面速度干涉系统和全光纤白光任意反射面速度干涉系统（ＦＶＩＳＡＲ）作了较全面的分析，论证了全光纤任意反射面速度干涉系统的主要意义在于实现了理想的空间相干、等程干涉、以及方便灵活的延时设置和极低的系统损耗。给关细的设计要点，报道了所研制的低激光二极管功率实验系统。以该系统进行了霍布金森杆一维应力加载下的自由面速度测试。实验结果与阻抗匹配法计算结果吻合很好，并获得了加载减载过程中产生的自由

All-Fiber White-Light Velocity Interferometric System of any Reflector

A new velocity interferometer system called all fiber white light velocity interferometic system of any reflector (FVISAR) is demonstrated. The important developments of the FVISAR are discussed, such as the perfect space interference property and the potential to work with very short coherence length light source even if white light, in comparison with the conventional velocity interferometric system of any reflector(VISAR) which consists of complicated discrete optical elements. The key points in designing a FVISAR are described in detail, and an experimental FVISAR system with very low surce power is reported. Preliminary tests to the FVISAR were conducted using the Hopkinson Bar system. Results show that the observed free surface velocities of LY 12 aluminum samples were in good agreement with theoretical estimations by impedance match. The oscillations of the free surface velocity of the LY 12 aluminum samples during the loading and unloading processes can be detected and observed clearly, which results from the wave reflections between the free surface and the steel bar/sample interface.