Accession Number : AD0602142

Title :   PRESSURE CALIBRATION OF THE GOETZ AEROSOL SPECTROMETER,

Corporate Author : ARMY ELECTRONICS LABS FORT MONMOUTH N J

Personal Author(s) : Gerber,Herman E.

Report Date : APR 1964

Pagination or Media Count : 33

Abstract : The report discusses and determines the pressure dependence of the operating characteristics of the Goetz Aerosol Spectrometer. Since the fallout of particles in the Goetz centrifuge depends on the mean free paths of the air molecules, the deposition characteristics of the aerosol particles (according to the Cunningham correction to the Stokes Law) become a function of air density or pressure. Calibration runs were conducted with monodisperse latex particles of various sizes in a pressure chamber simulating various atmospheric altitudes. The deposition lengths for aerosol particles of a given size decrease with decreasing pressure. The smaller the aerosol particles, the greater is the pressure dependence on the particle deposition. Correction factors could be determined for various particle sizes in atmospheric pressure. Some examples of application of these pressure calibrations to field measurements are presented. (Author)

Descriptors :   (*METEOROLOGICAL INSTRUMENTS, SPECTRUM ANALYZERS), (*SPECTRUM ANALYZERS, CALIBRATION), (*AEROSOLS, SPECTROSCOPY), CENTRIFUGES, SENSITIVITY, PRESSURE, PARTICLE SIZE, MEASUREMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE