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研制了一套线面同时成像任意反射面速度干涉仪(VISAR)用于激光驱动飞片速度场时空分辨测量。将传统VISAR改为成像干涉结构,用变像管扫描相机和高速光电分幅相机分别记录作为信号载体的梳状干涉条纹,实现靶面一条线上各点速度历史和多个时刻二维靶面上所有点速度的测量。所研制的线面同时成像VISAR具有小于10μm的空间分辨和约15m/s的速度分辨能力,线成像VISAR时间分辨小于50ps,面成像VISAR曝光时间小于5ns。用其测量了激光驱动带约束刀口铝膜飞片的速度场,给出了高时空分辨全场速度分布,从中可以清晰看出飞片的演化发展过程。实验结果表明,线面同时成像VISAR将是各种飞片产生技术及相应加载手段中全场速度诊断的有力工具。
A set of line-parallel imaging arbitrary reflection surface velocity interferometer (VISAR) was developed for space-time resolution measurement of laser driven flyer velocity field. The traditional VISAR is changed to the imaging interference structure. The variable frequency tube scanning camera and the high speed photoelectric photo camera are respectively used to record the comb interference fringes as the signal carrier, so that the speed history of each point on a line of the target surface and the two-dimensional target surfaces All points on the speed measurement. The developed line-plane imaging VISAR has less than 10μm spatial resolution and about 15m / s velocity resolution. The linear imaging VISAR time resolution is less than 50ps and the surface imaging VISAR exposure time is less than 5ns. The speed field of aluminum film flywheel constrained by laser driving belt was measured, and the full field velocity distribution of space-time resolution was given, from which the evolution and development of flyer could be clearly seen. The experimental results show that VISAR will be a powerful tool to detect the speed of the full field in all kinds of fly-blade generation techniques and corresponding loading methods.