Measuring and testing – Gas analysis – Solid content of gas
Patent
1984-06-26
1985-10-01
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Solid content of gas
340628, 356438, G01N 1500
Patent
active
045438153
ABSTRACT:
An aerosol detector, for instance a transmission measurement path in a measurement chamber, is provided for the detection of a foreign component in a gas, for instance of incendiary aerosols or smoke in air, and communicates with a reference chamber containing aerosol-free reference gas. The gas in the measurement chamber is periodically exchanged for uncontaminated gas from the reference chamber by a periodical volume alteration of the reference chamber so that, in the presence of aerosols, the aerosol concentration in the measurement chamber and the output signal of the aerosol detector are modulated. The modulation, i.e. the variable portion of the output signal, is an indication of the aerosol concentration or the smoke density. A particularly suitable application is smoke detection in air for the purpose of fire or incendiary reporting or for monitoring air pollution.
REFERENCES:
patent: 2486622 (1949-11-01), White, Jr.
patent: 2966092 (1960-12-01), Hartridge
patent: 3312826 (1967-04-01), Finkle
patent: 3860818 (1975-01-01), Stalded et al.
patent: 3994603 (1976-11-01), Paschedag
Guttinger Hannes
Pfister Gustav
Strassler Sigfrid
Troup Alan
Cerberus AG
Kleeman Werner W.
Kreitman Stephen A.
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