Opacity and forward scattering monitor using beam-steered solid-

Details Opacity and forward scattering monitor using beam-steered solid- Opacity and forward scattering monitor using beam-steered solid-

1996-12-06

1998-05-12

Nelms, David C.

Optics: measuring and testing

By particle light scattering

With photocell detection

356440, 356343, 250574, 250576, G01N 2100

Patent

active

057514232

ABSTRACT:
An improved transmissometer/particulate monitor of the type which has an optical assembly containing a solid state light source preferably a solid-state laser. The light source emits a collimated beam that is split, part of which is focused onto a reference detector that monitors the intensity of the light source, while the other part is directed to a beam-steering apparatus that causes the beam to accurately pass through a gaseous sample to a desired location such as a retro-reflector. A position-sensing detector is used in a closed-loop manner to control the beam-steering apparatus. The ratio of the total energy of the detected light beam, relative to the reference detector output, is used to determine the opacity of the gaseous sample or to provide a basis for correlation to particulate loading of the sample or both. The correlation to particulate loading is enhanced by a feature of the invention which measures the angular distribution of forward-scattered light to provide information as to the particle size distribution of the particulates.

REFERENCES:
patent: 3526460 (1970-09-01), Webb
patent: 3915572 (1975-10-01), Orloff
patent: 4221485 (1980-09-01), Schulze
patent: 4541719 (1985-09-01), Wyatt
patent: 4577964 (1986-03-01), Hansen, Jr.
patent: 4791427 (1988-12-01), Raber et al.
patent: 5132548 (1992-07-01), Borden et al.
patent: 5173958 (1992-12-01), Folsom et al.
patent: 5565984 (1996-10-01), Girvin

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