Deshler, T., Observations for Chemistry (In Situ): Particles, article for Encyclopedia of Atmospheric Science, Academic Press, 2002.

Wyoming Optical Particle Counter, r > 0.2 - 10.0 m Aerosol in Optical Chamber Processor White light PHA PMTs Pump

1971 - 1990 1990 - present Post El Chichon

Low Gain Mid Gain High Gain

M=1.33 1.45 1.59 0.1 µm 0.2 0.3 0.4 White light

M=1.33 1.45 1.59 M=1.33 1.45 1.59 1.0 µm X=10 0.5 µm 0.6 0.7 0.8