条纹相机扫描速度调节电路  

A Sweep Rate Accommodation Circuit for Streak Camera

作　　者：何徽[1] 温伟峰[1] 张登洪[1] 刘寿先[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《西安交通大学学报》2013年第12期66-70,共5页Journal of Xi'an Jiaotong University

基　　金：国家重大科学仪器设备开发专项资助项目(2011YQ130019)

摘　　要：针对超快瞬态物理现象的光学诊断中固定扫速条纹相机不能用于探测不同时间尺度光学过程的问题,提出一种条纹相机扫描速度调节电路。该扫描电路由一个高压快脉冲发生单元和一个速度调节单元组成,使用串联型RLC二阶电路将脉冲发生单元产生的高压阶跃电压变换为欠阻尼振荡电压,取振荡信号前沿线性度最好的一段作为扫描电压,通过调整振荡信号频率来调整扫描信号斜率,从而调节扫描速度。用多组RLC二阶电路实现多个扫速档位,用电磁继电器在多个档位之间切换。理论分析和实验结果均表明,多组RLC电路结合电磁开关可实现扫速多档可调,从而使同一台条纹相机既能用于诊断持续时间仅为数百皮秒的超快瞬态物理现象,亦能用于记录持续时间为数十纳秒的光学过程。A sweep rate accommodation circuit for streak camera is proposed to address the problem that streak cameras with a fixed sweep rate can not be used to diagnose ultrafast transient physical experiments in different time scale. The sweep circuit consists of a high voltage pulse generator and a speed regulator. The step voltage pulse from the pulse generator is converted into an underdamped oscillation voltage through a two-order RLC circuit with a series topology, and the part in the front-edge of the oscillation signal, which has the best linearity, is used as the sweep voltage. The slope of the front-edge of the oscillation signal is adjusted through adjusting the frequency of the oscillation, as a result, the sweep rate of the streak camera can be regulated. Several RLC circuits are used to realize multiple sweep speed gears, and electromagnetic relay switches are used to switch between gears. Theoretical analysis and experimental results show that several RLC circuits in combination with electromagnetic switches can make the sweep rate of the streak camera adjustable with multiple gears, so that a streak camera can be used not only to perform the diagnosis of a physical phenomenon lasting for only hundreds of picoseconds, but also to record an optical phenomenon with a duration of tens of nan- oseconds.

关 键 词：条纹相机 变像管扫描相机 RLC二阶电路 扫速调节电路 

分 类 号：TN29[电子电信—物理电子学]