24 March 1970 Photometric Calibration Of Imaging Systems Used In Space
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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).
© (1970) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James E. Davis "Photometric Calibration Of Imaging Systems Used In Space", Proc. SPIE 0019, Space Optics I, (24 March 1970); doi: 10.1117/12.946844; https://doi.org/10.1117/12.946844
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