A Method of Measuring Drop Size Distributions in Laboratory Clouds

Morris Neiburger Dept. of Meteorology, University of California, Los Angeles 90024

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Zev Levin Dept. of Meteorology, University of California, Los Angeles 90024

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Lawrence Rodriguez Dept. of Meteorology, University of California, Los Angeles 90024

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Abstract

A method of measuring drop size distribution in clouds, especially adapted for wind tunnels and other cloud chambers in which the cloud is carried in an air stream, is presented. It consists of photographing the cloud illuminated both by a continuous source and a stroboscopic light. The fall velocities of the drops determined from the photographs are used with tables of terminal velocities to give the size distributions. The advantages of the method are discussed.

Abstract

A method of measuring drop size distribution in clouds, especially adapted for wind tunnels and other cloud chambers in which the cloud is carried in an air stream, is presented. It consists of photographing the cloud illuminated both by a continuous source and a stroboscopic light. The fall velocities of the drops determined from the photographs are used with tables of terminal velocities to give the size distributions. The advantages of the method are discussed.

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