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Proceedings Paper

The Microdensitometer Revisited
Author(s): Richard E. Swing
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Paper Abstract

The developments leading to the characterization of microdensitorneter optical performance, through application of the principles and methods of the theory of partial coherence, are briefly reviewed and a summary of the papers contributing to the current state of knowledge is given. The basic imaging equations are presented and briefly discussed. The problem of achieving effective incoherence in the system illumination with incandescent sources is also discussed and the current criterion evaluated. The development of a new criterion for effective incoherence is then undertaken and a more useful inequality is derived. In those instances where the maintaining of effectively incoherent illumination conflicts with the minimizing of flare -- a case common to systems with limited reduction factor for the influx subsystem -- it is shown that there is a performance tradeoff: linearity (which occurs with incoherent illumination) or flare (which occurs with excessive over-illumination of the sampling aperture). A quantitative relation between these is established and a procedure is outlined for reconfiguring the microdensitometer to meet coherence requirements with a minimum of excess flare.

Paper Details

Date Published: 25 October 1979
PDF: 10 pages
Proc. SPIE 0194, Applications of Optical Coherence, (25 October 1979); doi: 10.1117/12.957907
Show Author Affiliations
Richard E. Swing, Consultant (United States)

Published in SPIE Proceedings Vol. 0194:
Applications of Optical Coherence
William H. Carter, Editor(s)

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