Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-09-29
1993-10-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250379, 324464, G01N 1506
Patent
active
052548619
ABSTRACT:
System and method for detection and measurement of airborne biological aerosol particles in a gaseous sample are described comprising a source of low energy radiation for irradiating the gaseous sample whereby biological particles in the sample are ionized, a detector for detecting ionized biological particles in the sample including a pair of electrically charged conducting plates disposed in parallel confronting relationship to each other with a preselected space therebetween, a source of electrical power operatively connected to the plates for applying a preselected electrical potential thereacross, and electronics for sensing collisions on the plates of ionized biological particles in the sample.
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"Photoelectric Charging and Detection of Ultrafine Particles", Federer et al, Atmospheric Environment 17:3, 655-657 (1983).
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Aerosol Technology, Hinds, John Wiley & Sons, New York (1982).
Carpenter David R.
Taboada John
Kundert Thomas L.
Le Que T.
Nelms David C.
Scearce Bobby D.
The United States of America as represented by the Secretary of
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