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为了研究逆向调制器结构参数及接收距离对系统反射光特性的影响,通过建立“猫眼”目标离焦结构等效模型,采用几何光学方法对该模型进行理论分析,推导出表达反射光特性(发散半角、反射光斑半径、反射光功率密度)的相应计算公式并进行数值计算和实测实验。理论分析与实验结果表明:逆向调制器结构参数及接收距离对调制系统反射光斑半径和功率密度的影响明显且呈规律变化,减小透镜焦距、增大透镜口径、增大接收距离可以加快反射功率随离焦量变化速度,有助于改善调制效果。且一般情况下,正离焦的反射光发散半角小于负离焦的反射光发散半角。
In order to study the influence of the structure parameters of the reverse modulator and the receiving distance on the reflected light characteristics of the system, the equivalent model of the “cat’s eye” defocus structure was established and the geometrical optics method was used to analyze the model theoretically. (Divergence half angle, reflected spot radius, reflected light power density) of the corresponding formula and numerical calculations and experimental measurements. Theoretical analysis and experimental results show that the structural parameters of the reverse modulator and the receiving distance have obvious and regular changes on the reflection spot radius and power density of the modulation system, reducing the focal length of the lens, increasing the aperture of the lens and increasing the receiving distance can accelerate the reflected power With the rate of change of defocus, help to improve the modulation effect. In general, the defocused reflected light diverges half a degree less than the defocused reflected light diverges half a degree.