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15 November 2010 Design of precision approach path indicator with LEDs as its light sources
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Traditional PAPIs commonly use halogen lamps as their light sources, which have short lifetime. LEDs have much longer lifetime and thus can enhance the reliability of PAPIs. In this paper, a new design of a PAPI based on LED light sources is introduced. White and red LEDs are used to emit white and red beam separately. The white and red LEDs are separated into two cases. In each case there is a single lens in front of the LED, separately. The LEDs are placed exactly at the focal planes of the lens. The white LED is fixed below the optical axis to project the white light in the upper part, and the red LED is fixed oppositely. Baffles are used to form a sharp separation of the beam. Optical simulation is carried out to verify the design. The measurement results of the finally realized model show that it meets the requirements of the technical criterion.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Haiping Shen, Xiaoli Zhou, Wanlu Zhang, Jiangen Pan, and Muqing Liu "Design of precision approach path indicator with LEDs as its light sources", Proc. SPIE 7852, LED and Display Technologies, 78520D (15 November 2010);


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