激光主动干涉条纹间距识别光学目标口径

Identification Method of the Optical Target Aperture by Laser Active Interference Fringe Spacing

利用物理光学相关知识及Collins衍射积分公式和硬边光阑的复高斯函数分解法,推导得到目标处干涉图样条纹间距与光学目标反射光时间分布关系的解析表达式.从原理分析、仿真计算和实验研究等方面研究了干涉场的条纹间距、光学目标口径参数和反射光时间分布包络的峰峰数、峰峰间距和峰峰比之间定量关系.结果表明,当条纹间距的大小约为目标的口径尺寸时,反射光时间分布包络的峰峰数由单峰向多峰过渡,峰峰间距和峰峰比曲线会出现极大值,根据这一变化规律可以估测出光学目标的口径参数,其估测精度受条纹间距可调节范围的影响.

The analytical expression of the relationship between interference fringe spacing of target pattern and light time distribution of optical target reflection was derived by using the related knowledge of physical optics,Collins diffraction integral formula and the hard edge aperture complex Gauss function decomposition method.The quantitative relationship between interference field fringe spacing,optical aperture size and target reflected light time distribution of envelope peak number,peak to peak spacing and peak to peak ratio was discussed from the aspect of principle analysis,simulation and experimental.The results show that when the fringe spacing is about the size of the target aperture,the peak number of reflected light time distribution envelope is from single peak to multi peaks,and the peak to peak spacing and peak to peak ratio curves appear a maximum value.The estimation results of the aperture parameters can be deduced according to the change rule of parameters mentioned above,its accuracy is affected by the fringe spacing adjustable range.