Optics: measuring and testing – With sample preparation – Condensation nuclei detector
Patent
1998-02-11
1999-05-11
Kim, Robert H.
Optics: measuring and testing
With sample preparation
Condensation nuclei detector
356338, G01N1/26
Patent
active
059033380
ABSTRACT:
A modified mixing-type condensation nuclei counter for measuring the size and number of small particles is presented. A gas stream is saturated with respect to a working fluid. The saturated gas at a first temperature is mixed in a growth chamber with a sample gas at a second temperature that is lower than the first temperature. The mixture of the saturated gas and the sample gas at different temperatures results in supersaturation of the mixed gas with respect to the working fluid. Particles in the sample gas act as nucleation sites for condensation of the working fluid. The particles are thus grown to a larger size and therefore are more easily measured by known light-scattering particle detection methods. The efficiency of the supersaturation process is made even more efficient by cooling the growth chamber to a third temperature which is lower than the second temperature or by turbulently mixing the saturated gas and the sample gas. False count rate is reduced by filtering the saturated gas before it is mixed with the sample gas to remove droplets of the working fluid from the saturated gas.
REFERENCES:
patent: 3592546 (1971-07-01), Gussman
patent: 3694085 (1972-09-01), Rich
patent: 3806248 (1974-04-01), Sinclair
patent: 4293217 (1981-10-01), Bird, Jr. et al.
patent: 4449816 (1984-05-01), Kohsaka et al.
patent: 4790650 (1988-12-01), Keady
patent: 4950073 (1990-08-01), Sommer
patent: 5011281 (1991-04-01), Harris
patent: 5076097 (1991-12-01), Zarrin et al.
patent: 5239356 (1993-08-01), Hollander et al.
patent: 5247842 (1993-09-01), Kaufman et al.
patent: 5519490 (1996-05-01), Nakata et al.
Continuous Automated Measurement of the Soluble Fraction of Atmospheric Particulate Matter, written by Poruthoor K. Simon and Purnendu K. Dasgupta, Analytical Chemistry, vol. 67, No. 1, Jan. 1, 1995, pp. 71-78.
Microphysical Measurements of Fog Formed in a Turbulent Jet, written by Madeleine L. Strum and Herbert L. Toor; Aerosol Science and Technology 16, 1992, pp. 151-165.
Mavliev Rashid A.
Parsons Craig A.
Kim Robert H.
Particle Measuring Systems, Inc.
Smith Zandra V.
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