Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1984-05-10
1987-12-01
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250235, 358293, G02B 2610
Patent
active
047106247
ABSTRACT:
Apparatus and a method for providing measurements of the diffuse transmittance or reflectance of a sheet at a set of points arranged along a pattern line on the sheet. In accordance with the invention, the sheet, such as a photographic film, is moved with respect to a cylinder with a slot cut in its wall parallel to its central axis. A beam of radiation is swept parallel to the slot and into the cylinder after scanning along a line on the sheet. The inner wall surface of the cylinder is coated with a high reflectance material so that a fraction of the directly transmitted and scattered radiation in the cylinder enters one or more electronic radiation detectors coupled to the cylinder. The fraction of the radiation measured depends on the position along the slot of the radiation beam, and the data are corrected by dividing the measurement at each point by the measured radiation at that point when no object is in the beam. Several embodiments of the cylinder are disclosed.
REFERENCES:
patent: 4314283 (1982-02-01), Kramer
patent: 4370678 (1983-01-01), Kitamura
patent: 4453180 (1984-06-01), Juergensen
Alvarez Robert
Lehmann Leonard
Strul Bruno
Digirad Corporation
Westin Edward P.
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