title: Optical particle size measurements of hygroscopic smokes in laboratory and field environments.
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.
authors.forename: W M
authors.initials: WM
authors.lastname: Farmer
authors.forename: R D
authors.initials: RD
authors.lastname: Morris
authors.forename: F A
authors.initials: FA
authors.lastname: Schwartz