Method and apparatus for measuring particulate concentration in

Details Method and apparatus for measuring particulate concentration in Method and apparatus for measuring particulate concentration in

1974-08-30

1976-08-10

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

250552, 250564, 250573, 356186, 356201, 356208, 331 945S, G01N 2112, G01N 2126

Patent

active

039738523

ABSTRACT:
A method and portable apparatus for measuring particulate concentration in the atmosphere utilizing uniform laser pulses to traverse the atmosphere to be measured and a photo-electronic receiver which discriminates against stray light and detects the attenuation of the laser pulses. This attenuation is caused by particulates in the atmosphere which tend to scatter or absorb light. By using monochromatic laser pulses having wavelengths lying in transparent atmospheric windows, error is not introduced by the attenuation of the beam due to gases occurring naturally in the atmosphere including water vapor. Thus concentration of particulates such as smoke, fog, smog, dust and the like are measurable.

REFERENCES:
patent: 3419333 (1968-12-01), Towner
patent: 3655289 (1972-04-01), Walker
patent: 3711210 (1973-01-01), Krukowski

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