System for detection of extremely small particles in a low press

Details System for detection of extremely small particles in a low press System for detection of extremely small particles in a low press

1987-10-27

1988-12-20

Levy, Stewart J.

Optics: measuring and testing

With sample preparation

Condensation nuclei detector

G01N 100

Patent

active

047921994

ABSTRACT:
A system for detection of extremely small particles in a low pressure environment or vacuum includes a vapor column in which a diffusion oil is vaporized, a saturation column in which vaporized oil is cooled and supersaturated, and means for directing a low pressure gas into the saturation column. An optical detector senses the oil droplets that grow around extremely small particles which are introduced in the saturation column by the gas and fall past the detector.

REFERENCES:
patent: 2684008 (1954-07-01), Vonnegut
patent: 3526461 (1970-09-01), Lindahl et al.
patent: 3592546 (1971-07-01), Gussman
patent: 3694085 (1972-09-01), Rich
patent: 3890046 (1975-06-01), Hart et al.
patent: 4477187 (1984-10-01), Pettet et al.
patent: 4670637 (1987-06-01), Morrison et al.
patent: 4696571 (1987-09-01), Goldberg et al.

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