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Photometer calibration problem for extended astronomical sourcesAnalysis of calibration tests for the Skylab experimental T027 photometer is used to show that if an instrument is focused at infinity, the uniform extended calibration source should be positioned at distances at least equal to the hyperfocal distance and should be large enough to fill the field of view. It is noted that the field depth can be increased by focusing the optical system at the hyperfocal distance and that this method of focusing reduces the needed diameter of the calibration source to half that of a system focused at infinity. Other calibration methods discussed includes determining the radiance responsivity distance and extrapolating the curve to larger distances as well as extensive mapping of the spatial response combined with the irradiance responsivity to obtain the radiance responsivity.
Document ID
19750052232
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Muscari, J. A.
(Martin Marietta Aerospace Denver, Colo., United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1975
Publication Information
Publication: Applied Optics
Volume: 14
Subject Category
Instrumentation And Photography
Accession Number
75A36304
Funding Number(s)
CONTRACT_GRANT: NAS8-24000
Distribution Limits
Public
Copyright
Other

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