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Proceedings Paper

Photometric Calibration Of Imaging Systems Used In Space
Author(s): James E. Davis
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Paper Abstract

Photographic systems used in the Apollo program for photometric data reduction require more precise methods of photometric calibration than are used to determine the nominal operating parameters. A technique for more precise photometric calibration of cameras is described. This involves the determination of the absolute magnitude and spatial variation of illuminance in the image plane of a camera as a function of the nominal operating parameters such as f-stop. The method involves photographing an artificial scene of known, luminance which has the same approximate color temperature as the object to be photo-graphed. This calibration must be performed at all of the various camera settings. The processed photographs will be scanned by a microdensitameter to analyze the transmission efficiency and the error in calibration of shutters and lenses. By use of this calibration information a determination of scene brightness can be made from image density when using the proper sensi-tometric calibration (density vs. log exposure).

Paper Details

Date Published: 24 March 1970
PDF: 8 pages
Proc. SPIE 0019, Space Optics I, (24 March 1970); doi: 10.1117/12.946844
Show Author Affiliations
James E. Davis, Lockheed Electronics Company (United States)

Published in SPIE Proceedings Vol. 0019:
Space Optics I
Brian J. Thompson, Editor(s)

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