UV light propagation under low-visibility conditions and its application to aircraft landing aid

Gerard Durand; Claire Lavigne; Antoine Roblin

doi:10.1117/12.564791

11 November 2004 UV light propagation under low-visibility conditions and its application to aircraft landing aid

Gerard Durand, Claire Lavigne, Antoine Roblin

Proceedings Volume 5572, Optics in Atmospheric Propagation and Adaptive Systems VII; (2004) https://doi.org/10.1117/12.564791
Event: Remote Sensing, 2004, Maspalomas, Canary Islands, Spain

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.

Citation Download Citation

Gerard Durand, Claire Lavigne, and Antoine Roblin "UV light propagation under low-visibility conditions and its application to aircraft landing aid", Proc. SPIE 5572, Optics in Atmospheric Propagation and Adaptive Systems VII, (11 November 2004); https://doi.org/10.1117/12.564791

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KEYWORDS

Scattering

Sensors

Ultraviolet radiation

Atmospheric modeling

Atmospheric propagation

Photons

Visibility

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