Single particle detector method and apparatus utilizing light ex

Details Single particle detector method and apparatus utilizing light ex Single particle detector method and apparatus utilizing light ex

1989-10-04

1992-06-16

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356335, 250574, G01N 1506, G01N 1514

Patent

active

051219883

ABSTRACT:
A particle flux counter apparatus utilizing light extinction. The apparatus utilizes two oppositely disposed cylindrical mirrors (21a, 21b) to bounce a beam back and forth between them, the beam traversing the length of the cylindrical mirrors (21a, 21b) in incremental steps. A plane mirror (22) is cooperatively located to reflect the beam back between the system to traverse the length of the cylindrical mirrors (21a, 21b) a second time in incremented steps. The two sets of steps interleaving such that the beam forms a sheet of light. A detector (60) monitors the intensity of the beam. As particles in a sample aerosol intersect the beam, the light is extinguished and the beam intensity changes. The detector (60) transmits a signal to a microprocessor (108) analyzation. The apparatus also utilizes a feedback circuit (300) to regulate the beam intensity and alternatively provides for modulating the beam to provide for higher peak power into the detector (60) and elimination of common mode noise.

REFERENCES:
patent: 3548655 (1970-12-01), Rudd
patent: 3851169 (1974-11-01), Faxvog
patent: 4739177 (1988-04-01), Borden

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