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Proceedings Paper

Detector perturbation of ocean radiance measurements
Author(s): Burns Macdonald; William S. Helliwell; James Sanborn; Kenneth John Voss
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Paper Abstract

The effect of a detector on the ocean radiance field being measured has been investigated -- first, in a simple model that accounts for perturbations in the radiance field introduced by the detector shadow and by light reflecting from the detector, and second, by a complete three- dimensional solution of the radiation transfer equation that calculates the perturbations by using a computer model of a 4(pi) radiance detection system (RADS2) with sky and ocean parameter choices to match California coastal water. Results show that the presence of the detector has little influence on downwelling measurements nor do changes in detector reflectance. There is a substantial change due to the detector of upwelling radiance values. This may cause measured values to be reduced by as much as 30% below the unperturbed radiance for systems of the size of RADS (0.5 m) for light coming from the region of the detector shadow. The upwelling irradiance for this case is reduced 10%. Results are given for sensor 0.5 m high and having diameters from 0.125 m to 2 m.

Paper Details

Date Published: 1 December 1991
PDF: 11 pages
Proc. SPIE 1537, Underwater Imaging, Photography, and Visibility, (1 December 1991); doi: 10.1117/12.48875
Show Author Affiliations
Burns Macdonald, Whitehead Associates (United States)
William S. Helliwell, Science Applications International Corp. (United States)
James Sanborn, Arete Associates (United States)
Kenneth John Voss, Univ. of Miami (United States)

Published in SPIE Proceedings Vol. 1537:
Underwater Imaging, Photography, and Visibility
Richard W. Spinrad, Editor(s)

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