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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-437
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-437
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Dec 2018

Research article | 20 Dec 2018

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Measurement Techniques (AMT).

Study of the diffraction pattern of cloud particles and respective response of Optical Array Probes

Thibault Vaillant de Guélis1, Alfons Schwarzenböck1, Valery Shcherbakov1,2, Christophe Gourbeyre1, Bastien Laurent1, Régis Dupuy1, Pierre Coutris1, and Christophe Duroure1 Thibault Vaillant de Guélis et al.
  • 1Université Clermont Auvergne, CNRS, UMR 6016, Laboratoire de Météorologie Physique, F-63000 Clermont-Ferrand, France
  • 2Université Clermont Auvergne, Institut Universitaire de Technologie d’Allier, Montluçon, France

Abstract. Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kind of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.

Thibault Vaillant de Guélis et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Thibault Vaillant de Guélis et al.
Thibault Vaillant de Guélis et al.
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