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Article Dans Une Revue Atmospheric Measurement Techniques Année : 2019

Study of the diffraction pattern of cloud particles and the respective responses of optical array probes

Résumé

Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2-D images. However, recorded 2-D images are subject to distortion based on the diffraction of light when particles are im-aged 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 patterns of all kinds 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.
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Dates et versions

hal-02113428 , version 1 (08-05-2019)

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Thibault Vaillant de Guélis, Alfons Schwarzenboeck, Valery Shcherbakov, Christophe Gourbeyre, Bastien Laurent, et al.. Study of the diffraction pattern of cloud particles and the respective responses of optical array probes. Atmospheric Measurement Techniques, 2019, 12 (4), pp.2513-2529. ⟨10.5194/amt-12-2513-2019⟩. ⟨hal-02113428⟩
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