Physics – Optics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5572...57d&link_type=abstract
Optics in Atmospheric Propagation and Adaptive Systems VII. Edited by Gonglewski, John D.; Stein, Karin. Proceedings of the SP
Physics
Optics
Scientific paper
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.
Durand Gerard
Lavigne Claire
Roblin Antoine
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