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Instrument: FCAS II : Focused Cavity Aerosol Spectrometer II
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The Focused Cavity Aerosol Spectrometer II (FCAS II) sizes
particles in the approximate diameter range from 0.09 to 2
microns. Particles are drawn from the free stream with a
near-isokinetic inlet and transported to the instrument. They
then pass through a laser beam, and the light scattered by
individual particles is measured (Fig. 1). Particle size is
related to the intensity of the scattered light. The data
reduction for the FCAS II takes into account the water that is
evaporated from the particle during sampling and the effects of
anisokinetic sampling.

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[Summary provided by NASA]