Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-08-10
1994-03-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356343, 356335, G01N 1506
Patent
active
052930491
ABSTRACT:
An optical particle counter generates a signal indicating an amount of radiation scattered by aerosols in a sample flow. Smoke can be discriminated from other aerosols in the sample flow by analyzing the AC component of the signal. Smoke has a much higher signal-to-noise ratio than that of larger particles such as dust and fog.
REFERENCES:
patent: 3624835 (1971-11-01), Wyatt
patent: 4420256 (1983-12-01), Fladda et al.
patent: 4556873 (1985-12-01), Yamada et al.
patent: 4647785 (1987-03-01), Morita
patent: 4839527 (1989-06-01), Leitch
patent: 5164604 (1992-11-01), Blair et al.
patent: 5194921 (1993-03-01), Tambo et al.
Article From Dec. 1972 Technical News Bulletin Entitled "New Apparatus Determins Particle Size Distribution in Real Time".
Article From Nov./Dec. 1980 Optical Engineering Entitled "Laser-Based Single Particle Counters for In Situ Particulate Diagnostics" by E. Dan Hirleman.
Chansky, Jr. Donald R.
Halik, IV Joseph F.
Morey Richard K.
Mormino Mark A.
Wylie Douglas J.
Allied-Signal Inc.
Black Joseph R.
Davenport A.
Nelms David C.
Walsh Robert A.
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