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Optical particle size measurements of hygroscopic smokes in laboratory and field environments

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Abstract

Optical particle size analyzer (PSA) measurements of hygroscopic smokes are reported from experiments conducted in laboratory chambers and in field tests. Three different instruments were used: a particle sizing interferometer; a Climet (model 211); and a Particle Measurement Systems PSA (model CSASP-100-HC). Field measurements were made in relative humidity conditions ranging between 65 and 97%. The results indicate that the size distributions are at least bimodal—not log-normal—and that mean particle diameter does not appear to increase with increasing relative humidity.

© 1981 Optical Society of America

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