Condensation nucleus counter employing supersaturation by therma

Details Condensation nucleus counter employing supersaturation by therma Condensation nucleus counter employing supersaturation by therma

1996-08-12

1997-10-07

Rosenberger, Richard A.

Optics: measuring and testing

With sample preparation

Condensation nuclei detector

356339, G01N 1506

Patent

active

056754051

ABSTRACT:
A condensation nucleus counter features an entropy control mechanism to regulate the entropy of a vaporized fluid present in a saturator, thereby facilitating supersaturation of the same about particulates entrained in a sample gas stream before the same passes through a condenser. The condensation nucleus counter includes a supply of sample gas, conduits adapted to allow the sample gas stream to flow therethrough, a saturator, a condenser and an optical detector, all of which are in fluid communication with each other. The manifold is disposed between the conduit and the saturator, and also a temperature control device. The manifold comprises a feed chamber and a plurality of channels positioned so that the sample gas stream entering the feed chambers evenly divides into a plurality of flows, with each flow entering the saturator. The temperature control device regulates the temperature difference between the flows entering the saturator and the vaporized fluid contained so as to be within a specified range. In this fashion, supersaturation occurs near the point where the sample flows enter the saturator.

REFERENCES:
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patent: 4790650 (1988-12-01), Keady
patent: 4950073 (1990-08-01), Sommer
patent: 5026155 (1991-06-01), Ockovic et al.
patent: 5118959 (1992-06-01), Coldow
patent: 5239356 (1993-08-01), Hollander et al.

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