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Proceedings Paper

VIIRS polarization sensitivity testing and analysis
Author(s): Eric C. Fest
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Paper Abstract

A requirement for the Visible/Infrared Imager Radiometer Suite (VIIRS) is that its polarization sensitivity be 3% or less for all VISNIR bands (412-865 nm). A test using a rotating polarizer sheet was performed on the sensor to validate this requirement, and though the test results show that the requirement is met, they also show a large variation in this polarization sensitivity (as much as 2%) across the field of view (FOV) in track. Though this result is unexpected, it may be the result of natural variations in the diattenuation and retardance of the VIIRS optics as a function of field angle. To test this theory, a raytracing model of the system was constructed using measured ellipsometric data from the VIIRS optics, and the polarization sensitivity of the model was computed. Using the nominal ellipsometric data, good correlation between the predicted and measured polarization sensitivity was not achieved. However, by applying small variations to the ellipsometric data as a function of position on the optics, it was possible to achieve good correlation. This paper gives the details of the sensor polarization sensitivity measurements, ellipsometric measurements, and raytracing analysis.

Paper Details

Date Published: 11 August 2009
PDF: 12 pages
Proc. SPIE 7461, Polarization Science and Remote Sensing IV, 746102 (11 August 2009); doi: 10.1117/12.828154
Show Author Affiliations
Eric C. Fest, Raytheon Co. (United States)

Published in SPIE Proceedings Vol. 7461:
Polarization Science and Remote Sensing IV
Joseph A. Shaw; J. Scott Tyo, Editor(s)

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