一种新的线成像激光干涉测速系统
A novel line-imaging velocity interferometer for shock diagnostics
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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86 μm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。Abstract: 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 Al 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.
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Key words:
- laser interferometer /
- line-imaging /
- shock diagnostics /
- velocity
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