Apparatus and method for reducing stray laser light in particle

Details Apparatus and method for reducing stray laser light in particle Apparatus and method for reducing stray laser light in particle

1994-07-06

2000-06-06

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

35633911, G01N 2100

Patent

active

060721871

ABSTRACT:
A dark-field particle monitor and a method for reducing errors due to stray light in the particle monitor provides a particle monitor having (i) an optical element focussed on the laser beam for detecting particles and (ii) a filter for preferentially selecting light incident on said filter in a preferential direction. In one embodiments the filter is implemented by a narrow band filter having maximum transmission for light having a wavelength of the laser beam.

REFERENCES:
patent: 4074939 (1978-02-01), Rabl
patent: 4679939 (1987-07-01), Curry et al.
patent: 4685802 (1987-08-01), Saito et al.
patent: 4857750 (1989-08-01), Millis et al.
patent: 4939369 (1990-07-01), Elabd
patent: 4953979 (1990-09-01), Hirako
patent: 5121988 (1992-06-01), Blesener et al.
patent: 5305073 (1994-04-01), Ford, Jr.

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