纳秒和亚纳秒光学分幅图像记录系统
Nano and sub-nanosecond optical image framing recording system
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摘要: 提出了一种光学亚纳秒分幅时间多幅数字图像记录系统，能够满足激光飞片和爆磁箍缩等极端条件下，对频率在108～1010 Hz的高速摄影需求。介绍了系统的设计方案和工作原理，提出了制约系统指标的关键技术如精密同步、高速高压脉冲源及解决方案。利用后台集中控制加上高精度的延迟单元提供各子系统的精密同步，利用雪崩三极管阵列构造纳秒和亚纳秒级的高压脉冲源驱动电光晶体偏转，利用8位可编程模拟延迟器件DS1023-25和FPGA器件结合获得ps精度的时间延迟。实验获得了幅度4 000 V、前沿小于5 ns的脉冲，任意时长、ps级精度的同步单元，对各子系统的同步协同工作也进行了调试。Abstract: A nano and sub-nanosecond optical image framing recording system is presented here to meet the photography demands of 108～1010 Hz frequency in extreme conditions, such as laser flyer and Z-pinch. The overall system design and its principle are introduced. Several key techniques and solutions (such as precise synchronization, high voltage pulser etc). are put forward. The precise synchronization of sub-systems is carried out by a microcomputer and some precise delay units. Nano and sub-nanosecond rise time high voltage pulses are provided by an avalanche transistor array. Picosecond level time delay is generated by 8-bit programmable analog delay chip DS1023-25 and FPGA. Some key experiments have been completed and the experiment results such as 4 000 V high voltage pulse of rise time less
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Key words:
- optical image framing /
- precise synchronization /
- high voltage pulse /
- time delay
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