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Proceedings Paper

UV light propagation under low-visibility conditions and its application to aircraft landing aid
Author(s): Gerard Durand; Claire Lavigne; Antoine Roblin
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Paper Abstract

In the spectral band typically lower than 290 nm, solar radiation doesn't reach the Earth surface due to ozone absorption. UV radiation of artificial sources can then be recorded with a high contrast, by day or night. Because of this property, this spectral domain is called "Solar Blind". Furthermore, many UV detectors work at ambient temperature and have high sensitivity. One can envisage to use UV sources as beacons, particularly to find one's way around in case of haze. Light scattering by atmospheric particulates and molecules gives rise to an aureole surrounding the source image which tends to reduce the contrast of the source with respect to the background. However, scattering phase functions of the haze droplets present a very important forward peak and spreading of detected signal is not as important as in case of a clear atmosphere where Rayleigh scattering predominates. Moreover, the range of UV radiation propagation is limited by the high ozone absorption cross section. All these physical phenomena have to be taken into account in order to evaluate UV radiation potential interest for landing aid under low visibility conditions. We present here different results on characterization of UV runway light, propagation of UV radiation in the atmosphere and on the use of different kinds of sensors that are necessary to assess this point.

Paper Details

Date Published: 11 November 2004
PDF: 11 pages
Proc. SPIE 5572, Optics in Atmospheric Propagation and Adaptive Systems VII, (11 November 2004); doi: 10.1117/12.564791
Show Author Affiliations
Gerard Durand, ONERA (France)
Claire Lavigne, ONERA (France)
Antoine Roblin, ONERA (France)

Published in SPIE Proceedings Vol. 5572:
Optics in Atmospheric Propagation and Adaptive Systems VII
John D. Gonglewski; Karin Stein, Editor(s)

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