光学学报, 2013, 33 (9): 0912007, 网络出版: 2013-08-15
分幅面成像任意反射面速度干涉仪诊断激光驱动飞片全场速度
Full Field Velocity Measurement of Laser-Driven Flyer Using Framing-Imaging Velocity Interferometer System for Any Reflector
测量 光学测量 全场速度 面成像任意反射面速度干涉仪 激光驱动飞片 干涉条纹 分幅面成像 measurement optical measurement full field velocity 2D imaging velocity interferometer system for any laser-driven foil interference fringe framing imaging
摘要
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5 μm的空间分辨和15 m/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。
Abstract
A framing-imaging velocity interferometer system for any reflector (VISAR) for measuring the integrity, speed dispersion and planarity of a flyer is developed. Based on the existing line-imaging VISAR, a smaller velocity-per-fringe constant is selected for higher velocity resolution, and a framing camera is used as a substitute for a streak camera to capture the two-dimensional (2D) interferograms at different time. Full-field velocity map is provided with a spatial resolution of 5 μm and a velocity sensitivity of 15 m/s. The technique is employed to measure a two-dimensional spatial velocity field of Cu (or Al) foils flyer driven by a pulse laser, and to reveal the continuous evolution of flyers. These results demonstrate that the framing imaging VISAR can be a valuable addition to the suite of diagnostics for the flyer planarity study.
刘寿先, 温伟峰, 袁树云, 陈光华, 刘俊, 彭其先, 李泽仁. 分幅面成像任意反射面速度干涉仪诊断激光驱动飞片全场速度[J]. 光学学报, 2013, 33(9): 0912007. Liu Shouxian, Wen Weifeng, Yuan Shuyun, Chen Guanghua, Liu Jun, Peng Qixian, Li Zeren. Full Field Velocity Measurement of Laser-Driven Flyer Using Framing-Imaging Velocity Interferometer System for Any Reflector[J]. Acta Optica Sinica, 2013, 33(9): 0912007.