距离选通成像系统关键性能的实验

Experiment on key performances of range-gated imaging system

对距离选通成像系统的关键性能参数—选通长度进行了理论分析和实验研究。运用激光波长为532 nm、脉冲宽度为20 ns的Nd:YAG激光器和ICCD系统搭建了一套距离选通成像系统。在改变选通信号宽度和选通延迟时间条件下,通过对视场内不同距离处的白板成像,获得了一系列实验图像。基于白板图像强度分析了选通信号宽度和延迟时间对距离选通成像系统选通长度的影响,并测量了当选通信号宽度为10ns时,该选通成像系统的有效选通时间长度为35ns。

Gate length of range-gated imaging system as a key characteristics was theoretically and experimentally analyzed in this paper. A frequency doubled 532 nm Nd：YAG laser that the pulse full width at half of maximum （FWHM） was 20 ns and ICCD was used to build up range-gated imaging system, what effects on imaging performance with the change of the bandwidth of the gate signal and gate delay time were studied through a straightforward method, which place white board signs at relevant distances in the field of view. Examples of imagery collected for different range and gate conditions will be presented and discussed with respect to the intensity at the signs in a gated images. When gate signal width is 10 ns, measurement result of the effective temporal gate length is 35 ns.