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Device for translating negative film image to a line scan

United States Patent

5,753,930
May 19, 1998
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A negative film reader records high-resolution optical density changes across negative film radiographic images to allow precise image dimensions to be determined. A laser light source capable of high-resolution focusing is passed through an intensity control filter, focused by a lens, and reflected off a mirror to focus in the plane of the negative film. The light transmitted through the film is collected by a second lens and directed to a photo diode detector which senses the transmitted intensity. The output of the photo diode signal amplifier is sent to the Y-axis input of an X-Y recorder. The film sample is transported in a plane perpendicular to the beam axis by means of a slide. The film position is monitored, with the signal amplified and recorded as the X-axis on the X-Y recorder. The linear dimensions and positions of image components can be determined by direct measurement of the amplified recording.
Dutton; G. Wayne (Longmont, CO)
The United States of America as represented by the United States (Washington, DC)
08/ 648,219
May 17, 1996
The United States Government has rights in this invention pursuant to Contract No. DE-AC04-90DP62349 between the United States Department of Energy and EG&G Rocky Flats, Inc.