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研制了一套分幅面成像任意反射面速度干涉仪(VISAR)用于飞片完整性、速度分散性和平面性的诊断。在线成像VISAR基础上,用更小的条纹常数实现更高的速度分辨,同时用光电分幅相机取代扫描相机记录干涉条纹图像,实现多个时刻全场速度的测量。所研制的面成像VISAR具有5μm的空间分辨和15m/s的速度分辨能力。用其测量了激光驱动铜膜或铝膜飞片的速度场,给出了多个时刻的全场速度分布,从中可以清晰看出飞片的演化发展过程。实验结果表明,分幅面成像VISAR技术可以为激光驱动飞片平面性的理论研究和数值模拟提供有效实验数据。
Developed a set of fractional imaging arbitrary reflection surface velocity interferometer (VISAR) for the diagnosis of flyer integrity, velocity dispersion and planarity. On the basis of online imaging VISAR, higher speed resolution is realized with smaller stripe constant, and the interference fringe image is replaced by a photo-framed camera instead of a scanning camera to measure the full-field speed at multiple moments. The developed surface imaging VISAR has 5μm spatial resolution and 15m / s velocity resolution. Using it to measure the speed field of laser driven copper film or aluminum film flyer, the full-field velocity distribution of multiple times is given, from which the evolution and development of flyer can be clearly seen. The experimental results show that the VISAR technique can provide effective experimental data for the theoretical research and numerical simulation of the planarity of laser driven flyer.