Share Email Print

Optical Engineering

Photographic Photometry Measurements Associated with the Interpretation of Point Object Radiant Intensity
Author(s): C. J.C. Thompson
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

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)

© SPIE. Terms of Use
Back to Top