Submicron particle counting enlarging the particles in a condens

Optics: measuring and testing – With sample preparation – Condensation nuclei detector

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G01N 100

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049500732

ABSTRACT:
An apparatus for detecting submicron particles in air includes a saturator for saturating a sample stream of the air with a vapor of a low volatility liquid and a condenser for cooling the vapor to form droplets around the particles to result in particles of a size detectable by an optical detector. Conduits extend through a bath of the liquid in the saturator so that sample streams passing through the conduits are heated by the bath. A flow divider divides a single sample stream at the inlet of the saturator into a plurality of laminar flow streams corresponding in number to the conduits. The condenser is a heat exchanger having a plurality of tubes with funnel-shaped inlet ends positioned over the bath of the saturator, and the tubes are inclined toward their inlet end so that condensed vapor flows back into the bath. A method for detecting particles in various size ranges involves operating the saturator at different temperatures to vary the minimum size particle which can be grown by condensation to a detectable size.

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patent: 4790650 (1988-12-01), Feady
patent: 4792199 (1988-12-01), Borden
patent: 4794789 (1989-06-01), Natako
Nesti, Jr., "The Condensation Nuclei Counter as an Air Pollution Weapon", No date.

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