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Optical Engineering

Photographic Photometry Measurements Associated with the Interpretation of Point Object Radiant Intensity
Author(s): C. J.C. Thompson
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Paper Abstract

The extant problems of point source photographic photometry in relation to re-entry vehicle cinephotography lie in the areas of obtaining radiant intensity measurement accuracies better than 50%, and in analysis of large numbers of photographic images within a reasonable time span. This paper reviews these problems, demonstrates and assesses a technique to improve overall calibration accuracy, and presents quantitative data on point image microstructure, useful in predicting accurate values of film-scanner operational parameters. An experimental study is described in which cali-bration curves of point image area and diameter versus exposure were produced for four Kodak emulsion types. Parameter values were chosen to simulate those encountered on a typical re-entry photography mission. The capabilities and limitations of the isodensitracer as used in a calibration scheme are assessed.

Paper Details

Date Published: 1 July 1968
PDF: 9 pages
Opt. Eng. 6(5) 605157 doi: 10.1117/12.7971398
Published in: Optical Engineering Volume 6, Issue 5
Show Author Affiliations
C. J.C. Thompson, McDonald Douglas Corporation (United States)


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