Physics – Optics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apopt..14.1491m&link_type=abstract
Applied Optics, vol. 14, July 1975, p. 1491, 1492.
Physics
Optics
Astronomical Photometry, Calibrating, Satellite-Borne Instruments, Skylab Program, Distance, Focusing, Photomultiplier Tubes, Radiance
Scientific paper
Analysis 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.
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