Apparatus for measuring light absorption

Details Apparatus for measuring light absorption Apparatus for measuring light absorption

1975-08-13

1976-12-28

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Bore inspection

356202, G01N 2122

Patent

active

039998630

ABSTRACT:
An open area photometer for determining the amount of light energy dissipated when a light source of known intensity is passed through a light restricting test specimen. The photometer includes a light source whose intensity level is established by an adjustable shutter positioned in front of the light source, a light diffusing element positioned between the shutter and a fresnel lens, a field effect phototransistor whose output is monitored on a micro-ammeter and a housing confining the components to prevent unwanted light loss. The specimen is positioned between the lens and the light diffusing element.

REFERENCES:
patent: 2206214 (1940-07-01), Wicker
patent: 3627431 (1971-12-01), Komarniski
patent: 3685885 (1972-08-01), Scott
patent: 3761184 (1973-09-01), McLaughlin, Jr.
patent: 3910701 (1975-10-01), Henderson et al.

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