Microwave aerosol waterometer

Details Microwave aerosol waterometer Microwave aerosol waterometer

G - Physics

01

N

324/29.8

G01N 22/00 (2006.01) G01R 27/26 (2006.01)

Patent

CA 1054678

ABSTRACT OF THE DISCLOSURE A gaseous medium containing aerosols is drawn through a quartz sampling tube and a filter located therein, with the aerosols becoming entrapped on the filter. The filter is located at the geometric center of a microwave cavity, and the principle resonance of the latter is tracked with the aid of a n adaptive electronic circuit. The time rate of change of the resonant frequency is a function of the rate of deposition of particulate matter on the filter, and principally of the liquid water content of those aerosols. Water in the vapor phase passes through the filter and does not affect the measurement; solid particulate does affect the frequency shift but in a second order manner and is readily compensated for after measurement of total aerosol mass deposited and the determination of the dielectric constant of the solid species therein. In a preferred embodiment a pair of microwave cavities is utilized to compare the resonant shift with the resonant frequency indicated for the same air sample after removal of the aerosol.

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