利用电荷耦合器件(CCD)在一定范围内与光照度成线性响应的特性，提出了一种通过双帧图像融合的方法，进行脉冲激光束散角的检测，并通过Matlab数学仿真和实验验证了其可行性和准确性。该方法扩大了光照度适用范围；弥补了CCD动态响应范围不宽的缺陷，很好的解决了脉冲激光束散角测量精度不高的问题。实验结果显示，该方法的测量精度为2%。

A method for measuring divergence angle of pulsed laser beam is proposed based on dual-frame image fusion and charge coupled device (CCD) characteristic that CCD camera response to illumination is nearly linearity in a certain range. The feasibility and accuracy are proved by experiment and mathematical simulation via Matlab. This method expands the application scope of illuminance measured and makes up the defects that CCD dynamic response range is not wide, and is a good solution to the question that pulsed laser beam divergent angle measurement accuracy is not high. The experimental results show that measurement accuracy of this method is 2%.