Publication:
Polarization effects on infrared target contrast

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Authors
Pontes, Marcos Cesar
Subjects
Thermal Imaging
Polarization
Target Contrast
Infrared Radiation
Advisors
Cleary, David D.
Cooper, Alfred W.
Date of Issue
1998-09
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
An analysis has been carried out of a data base of polarized long wave infrared images of the instrumented Research Vessel POINT SUR recorded over a period of two days during the EOPACE measurements series in San Diego Bay in 1996. The measurements were made from a land site on Point Loma with an AGA780 sensor with internally mounted polarization filters. The objectives of the analysis were to determine a possible influence of target aspect angle on the polarization signature, to compare polarization contrast improvement in San Diego Bay with previous measurements in the North Atlantic, and to validate by measurement the estimation of unpolarized signature from vertical and horizontal components. 5508 images representing 70 cases with vertical, horizontal and unpolarized sequences were analyzed. Using a horizontal polarizer, target to background contrast improvement was found with a mean of 1.08 (8%) compared with the 15% found in previous measurements. Estimated unpolarized signatures from vertical and horizontal components agreed with unpolarized measurements with a slope coefficient of .85 to .99. Target signature for major ship facets and for total ship showed no discernable degree of polarization. A total of 37 IDL programs developed for this analysis can be assembled as a package for future data processing
Type
Thesis
Description
Series/Report No
Department
Systems Engineering (SE)
Identifiers
NPS Report Number
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Format
xi, 176 p.;28 cm.
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Distribution Statement
Approved for public release; distribution is unlimited.
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