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在水下高重复频率距离选通成像系统的基础上,设计了一种全选通成像系统。在空间域中,可将整个探测区域划分为多个相互叠加的改进选通切片,一帧图像积分时间内的激光脉冲按照一定规律分布到各个改进选通切片中;在时间域中,在一帧图像积分时间内按照一定规律实现宽选通门对不同激光脉冲回波的等时差移动,使得一帧图像中包含所有距离的目标信息,实现了全选通实时成像。实验对比了连续光成像系统、传统距离选通成像系统和全选通成像系统的成像质量。实验结果表明,全选通成像系统同时具有连续光成像系统探测范围广和距离选通成像系统探测距离远的优点,探测距离大于4.5 H(H为衰减长度),输出视频的帧率为20Hz。
Based on the underwater repetitive frequency strobe imaging system, an all-gated imaging system is designed. In the spatial domain, the entire detection area can be divided into a plurality of improved gating slices which are superposed on each other. The laser pulses in one frame of image integration time are distributed to each improved gating slice according to a certain rule; in the time domain, In the frame image integration time, the isochronous movement of the wide gating gate to different laser pulse echoes is realized according to a certain rule, so that the target information of all the distances is contained in one frame of image, and the real-time imaging of the full gating is realized. The experiment compares the imaging quality of continuous optical imaging system, traditional distance gated imaging system and full gated imaging system. The experimental results show that the omnidirectional imaging system has the advantages of wide ranging detection range and far detection distance from the gated imaging system. The detection distance is greater than 4.5 H (H is the attenuation length) and the output video frame rate is 20 Hz.