脉冲计数可调式高重频水下距离选通成像系统

摘要

The traditional underwater range-gated imaging system requires high single pulse energy .A high-repetition-rate underwater range-gated imaging system is designed to solve this problem .Com-pared with the traditional range-gated laser imaging system w hich accumulates one single echo signal to yield one frame , the high-repetition-rate underwater range-gated imaging system can integrate multi-echo signals to obtain one frame and make a rent-time adjustment of pulse numbers to get higher quality only with lower single pulse energy .The imaging experiment on the system in the pool shows that with an increase in pulse number in one frame ,the high-repetition-rate underwater range-gated imaging quality will improve and that the pulse numbers must be increased to obtain better quality images from a lower distance .%针对传统水下距离选通成像系统对激光器单脉冲能量要求较高的问题，设计了一种脉冲计数可调高重频水下距离选通成像系统。相对于传统单帧单脉冲水下距离选通成像系统，该系统能够在一帧内采用多个回波脉冲在成像器件上的积累实现多重曝光，并可实时调整一帧图像周期所需累积的脉冲数，仅需较低的单脉冲能量即可得到高质量图像。在水池内对系统进行了成像实验，结果表明：随着累积脉冲数目的增加，高重频水下成像的图像质量得到了改观；在更远距离处想要获得好的图像质量，则必须增加累积脉冲数。