Optics: measuring and testing – For light transmission or absorption
Patent
1980-12-29
1983-04-19
Arnold, Bruce Y.
Optics: measuring and testing
For light transmission or absorption
G01N 2101
Patent
active
043803962
ABSTRACT:
To measure the opacity of sheet material, such as paper, a beam of light is directed against the material and the intensity of any light passing through the material is sensed and converted to a visual readout. A plurality of opacity measurements are made at different areas on the sheet material and, when a selected number of measurements have been made, a readout of the average value of the measurements is generated. The particular technique enables a large number of opacity measurements to be quickly and conveniently made and averaged, and is considerably less complicated and time consuming than opacity measurements which are conventionally made as a function of contrast ratios.
REFERENCES:
patent: 2206214 (1940-07-01), Wicker
patent: 4224513 (1980-09-01), Casey et al.
patent: 4229107 (1981-10-01), Childers
Hufner, "Semi-Automatic Interpretation of Spectral Plates Using the MD100 Microdensitometer and the KSR 4100 Minicomputer", Jena. Rev., (Germany), vol. 22, 1977, pp. 220-223.
Bothe, K., et al., "Microprocessor-Controlled Photometric Evaluation of High Speed Cinematographic Films", J. Physics, Sci. Instrom., vol. 12, (1979), pp. 201-204.
Revesz et al., "A Laser Scanner for the Densitometric Analysis of Radiographs", Med. Phys. 6(3), May/Jun., 1979, pp. 216-218.
Arndt William A.
Damrau Wayne A.
Gunderson Donald J.
Arnold Bruce Y.
Consolidated Papers Inc.
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