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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 4
Ann. Geophys., 15, 451–459, 1997
© European Geosciences Union 1997
Ann. Geophys., 15, 451–459, 1997
© European Geosciences Union 1997

  30 Apr 1997

30 Apr 1997

A new airborne polar Nephelometer for the measurements of optical and microphysical cloud properties. Part I: Theoretical design

J. F. Gayet1, O. Crépel1, J. F. Fournol1, and S. Oshchepkov2 J. F. Gayet et al.
  • 1Laboratoire de Météorologie Physique, URA CNRS 267, Université Blaise Pascal Clermont-Ferrand, France
  • 2Institut of Physics, Minsk, Belorussia

Abstract. A new optical sensor, the airborne Polar Nephelometer, is described. The sensor is designed to measure the optical and microphysical parameters of clouds containing either water droplets or ice crystals or a mixture of these particles ranging in size from a few micrometers to about 500 µm diameter. The probe measures the scattering phase function of an ensemble of cloud particles intersecting a collimated laser beam near the focal point of a paraboloïdal mirror. The light scattered from polar angles from 3.49° to 169° is reflected onto a circular array of 33 photodiodes. The signal processing electronics and computer storage can provide one measurement of the scattering phase function every 100 ms or every 0.2 ms. The first part of the paper describes the theoretical design of a prototype version of the probe.

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