卡塞格伦镜头的猫眼效应激光反射特性

卡塞格伦(Cassegrain)及类卡塞格伦式光学镜头在光电装备中应用广泛.为了研究具备卡塞格伦式光学镜头的光电装备所特有的猫眼效应特性,采用ZEMAX光学设计分析软件建立了卡塞格伦镜头反射模型,利用物理光学传输方法仿真分析了其猫眼效应反射特性,并得出了猫眼效应可探测入射角范围.对一特定卡塞格伦镜头进行了激光辐照实验,得到了猫眼效应反射光斑图像,测试了猫眼效应绝对反射率以及反射光发散角.结果表明,当发射系统位于该卡塞格伦镜头的视场内时,可以探测到猫眼效应反射光,中心遮挡造成原路返回处光强分布中心能量降低,猫眼效应绝对反射率为11.48%,反射光发散角为3.3 mrad,按照假设条件可以满足30 km内激光主动探测的需要.

Laser Reflection Characteristics of Cat Eye Effect of Cassegrain Lens

Cassegrain and similar Cassegrain optical lenses are widely used in photoelectric equipment.In order to study the special laser reflection characteristics of cat eye effect of photoelectric equipment with Cassegrain optical lens,reflection model of Cassegrain lens is established using the ZEMAX software.By the method of physical optics propagation,the reflection characteristics of cat eye effect are simulated and analyzed,and the range of incidence angle in which cat eye effect could be detected is obtained.In the experiment,a Cassegrain lens is irradiated by laser,the images of cat eye effect reflection light are obtained,and the absolute reflectivity of cat eye effect and the divergence angle of the reflection light are tested.The results show that the reflection light of cat eye effect can be detected when the expanding system is placed in the field-view of the Cassegrain lens.The center shelter leads to the decrease of the center energy at the return place.The absolute reflectivity of cat eye effect is 11.48%,the divergence angle of the reflection light is 3.3 mrad,so a detection with distance of 30 km can be easily achieved.