设计了一种基于大功率高光密度发光二极管(LED)光源的投弹照明灯。基于非成像光学理论,利用ZEMAX软件建立了以大口径高透过率菲涅耳透镜为核心元件的准直光学系统。利用焦距为1500 mm的柱面菲涅耳透镜对准直光束进行一维方向的扩散,再将灯具以6.85°的倾斜角度照射靶面,实现了大面积光斑照明。利用TracePro软件进行仿真分析,得到光斑水平方向和垂直方向的发散角分别为18.1°和2.46°。样机在靶标上投射出一个清晰、对比度高的类椭圆形亮斑,中心最大照度可达110 lx,能够满足战斗机夜间投弹训练的要求。

A projectile spotlight is designed based on the light emitting diode(LED) source with a high power and a high optical density. Based on the non-imaging optical theory and by using the ZEMAX software, a collimating optical system with the large-aperture and high-transmissivity Fresnel lens as the core element is established. A cylindrical Fresnel lens with a focal length of 1500 mm is used for the diffusion of the collimated beam along one-dimensional direction and then the spotlight is irradiated at the target surface with a tilt angle of 6.85° and finally a large area illumination is realized. The simulation analysis by the TracePro software shows that the divergence angles of light spot in the horizontal and vertical directions are 18.1°and 2.46°, respectively. A clear and high contrast oval-like shaped bright spot is obtained when the prototype is projecting on the aiming target, and the maximum illuminance at its center is over 110 lx, which meets the requirement of the night shooting for fighters.