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Proceedings Paper

Design of precision approach path indicator with LEDs as its light sources
Author(s): Haiping Shen; Xiaoli Zhou; Wanlu Zhang; Jiangen Pan; Muqing Liu
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Paper Abstract

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.

Paper Details

Date Published: 15 November 2010
PDF: 7 pages
Proc. SPIE 7852, LED and Display Technologies, 78520D (15 November 2010); doi: 10.1117/12.870416
Show Author Affiliations
Haiping Shen, Fudan Univ. (China)
Xiaoli Zhou, Fudan Univ. (China)
Wanlu Zhang, Fudan Univ. (China)
Jiangen Pan, Everfine Photo-E-Info Co., Ltd. (China)
Muqing Liu, Fudan Univ. (China)


Published in SPIE Proceedings Vol. 7852:
LED and Display Technologies
Gang Yu; Yanbing Hou, Editor(s)

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