摘要
设计并搭建了一种新的线成像激光干涉测速系统,用于小样品材料的冲击波诊断或飞片速度测量。系统采用梳状干涉条纹做为信号载体,利用1维光纤阵列+光电倍增管+数字示波器替代变像管扫描相机作为记录设备,记录伪推挽四路干涉信号,实现1 ns时间分辨和86μm空间分辨。用它测量了脉冲激光驱动铝膜飞片的速度场,获得对比度较好的信号,数据处理结果揭示了飞片加速过程将近20 ns,飞片的平面度为14.8 mrad。实验证明,该线成像激光干涉测速系统具有一定实用性。
A novel line-imaging velocity interferometer was developed and implemented, which is suited for small scale specimens shock wave experiments. Using a combination of fiber array, electron-multiplier phototube and digital oscilloscope for recording a comb fringe signal, the velocimeter was capable of 1 ns time resolution and 86 μm spatial resolution. Velocity measurement for A1 flyer driven by laser was implemented to test this system. The results showed that the flyer has a 20 ns acceleration history and 14.8 mrad planarity. The experiment confirmed that the new system is valuable for temporal-spatial shock diagnositics.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2009年第2期213-216,共4页
High Power Laser and Particle Beams
关键词
激光干涉测速
线成像
冲击波诊断
速度
laser interferometer
line-imaging
shock diagnostics
velocity
