Fog Drop-Size Distributions Measured with a Laser Hologram Camera

Abstract

Fog drop sizes were measured with a laser hologram camera. The camera samples volumes up to 4.5 cm2 at a rate of five samples per minute. The measured distribution is relatively unaffected by the measuring technique, since no sample collection or dilution is involved. The sample-to-sample variation of fog drop-size distributions is discussed. Mean drop-size data are presented for several fog cases. The problems encountered with, and the potential future use of, this technique for measuring fog and cloud droplets are discussed.