The Microdensitometer Revisited

Richard E. Swing

doi:10.1117/12.957907

25 October 1979 The Microdensitometer Revisited

Richard E. Swing

Proceedings Volume 0194, Applications of Optical Coherence; (1979) https://doi.org/10.1117/12.957907
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

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.

Citation Download Citation

Richard E. Swing "The Microdensitometer Revisited", Proc. SPIE 0194, Applications of Optical Coherence, (25 October 1979); https://doi.org/10.1117/12.957907

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