Optical submicron aerosol particle detector

Details Optical submicron aerosol particle detector Optical submicron aerosol particle detector

1993-02-12

1994-03-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250565, 356342, G01N 1506

Patent

active

052948064

ABSTRACT:
A particle detector that determines the presence of particles in an enclosed volume includes a laser that directs an optical beam to a beam splitter that produces first and second beams. An optical system directs the first beam into the enclosed volume. A detector is positioned adjacent the volume in order to receive back scattered optical energy arising from a particle in the volume encountering the first beam. The back scattered optical energy and the second beam are optically combined so as to overlap in a region and in the overlap region the back scattered optical energy and second beam are in the same state of focus, of the same polarization and are substantially parallel. A detector located at the overlap region produces an electrical signal indicative of the intensity of the back scattered light. A signal processor analyzes the electrical signal to determine the presence of the particle.

REFERENCES:
patent: 4355897 (1982-10-01), Kaye
patent: 5113083 (1992-05-01), Oka et al.

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