一种用于水下距离选通成像的变步长扫描方法

为了扫描时既减少"切片"数目又保证图像质量,采用一种用于距离选通水下激光成像的变步长的延迟递增方法,首先通过辐射探测理论和景深原理确定接收镜头的焦距和对焦位置以及系统需要扫描的范围,再依据水下激光脉冲时域展宽理论确定延迟递进的步长和相应的选通门宽,最后进行了仿真计算和实验.结果表明,在保证图像质量的同时,基于该方法的距...

A variable step scan method for underwater range-gated imaging

In order to both reduce the number of scanning frames and ensure the image quality,a variable step scanning method was put forward for range-gated underwater laser imaging.Firstly,the focal length,focal position of the receiver lens and the system scanning scope were defined based on both radiation detection theory and the principle of depth of field.Then the step size of delay and the width of the gated pulse were calculated according to the time-domain broadening of underwater laser pulses. Finally,the simulation and experiments were conducted.The experimental results show that the range-gated imaging system based on the proposed scan method can scan over the scope from 15m to 48.6m with 7 pulses imaging,and the image quality is kept at the same time.This proves the validity of this method,and provides an attempt for the actual application of range-gated technique in underwater imaging.