A Color Camera for In Situ Photography of Cloud Particles

Abstract

A technique is described for photographing airborne particles using small forward-scattering angles. The sample volume is defined as the region where collimated light beams of two different primary colors overlap. Images of particles within that volume are identified as those having the additive color of the two beams. The technique has the advantage of providing significantly more scattered light toward the camera lens than with 90° scattering commonly used in cloud chamber photography.