Cloud and Aerosol Particle Characterization (CAPAC) is a series of three instruments: the Forward Scattering Spectrometer Probe model 300 (FSSP-300), the Two Dimensional Optical Array Probes [Cloud and Precipitation Probes (2D-P)], and the CAPAC video. These instruments flew during the Convection and Moisture Experiment (CAMEX-3) campaign aboard the NASA DC-8, mounted on the left wing.
Cloud and aerosol particles are exposed to laser light to measure particle size from 0.3 micrometer to 6.4 millimeter, and both size and shape between 40 micrometer and 6.4 millimeter particle diameter as function of particle size. The size distributions thus determined will be integrated to yield particle surface area, and ice and liquid water contents in clouds and precipitation.