10 January 2018 Optical design of a LED searchlight system
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A 1200m visible searchlight system is designed based on photometry and application of geometric optics. To generate intensity distribution of this relatively powerful light beam we propose to use a high power LED and several refractive optical elements, which are composed of two plane-convex lenses and a conventional Fresnel lens. Two plane-convex lenses enable refraction of the side rays from the LED to the front direction which incident on the Fresnel lens. Fresnel lens, in its turn, concentrate the light flux and provide a nearly collimated beam to meet the requirement of forming a well-illuminated area across the road in the far field. Simulation data shows that this searchlight allow generating an appropriate illumination distribution for the long range requirements. A proof-of-concept prototype producing acceptable illuminance is developed.
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Chen Gong, Chen Gong, Haiping Xu, Haiping Xu, Jinhua Liang, Jinhua Liang, Yunfei Liu, Yunfei Liu, Zengquan Yuan, Zengquan Yuan, } "Optical design of a LED searchlight system", Proc. SPIE 10616, 2017 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 1061614 (10 January 2018); doi: 10.1117/12.2294610; https://doi.org/10.1117/12.2294610


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