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Proceedings Paper

Large-area blackbody emissivity variation with observation angle
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Paper Abstract

Calibration of wide-angle (100°+ field of view) long wave infrared cameras with commercially available large-area blackbody calibration targets poses problems. Typically the emissivity of blackbody sources is specified on axis and up to angles of approximately 20°. For wide-angle camera calibration the emissivity needs to be known out to 60° or greater. Presented is a technique that uses the known on-axis emissivity for the blackbody and changes in radiance with angle to determine the angle-dependent emissivity. Four commercial blackbodies with various surface structures were measured. The emissivity was found to be significantly angle dependent beyond 30°, dropping to 0.95 or less by 60°.

Paper Details

Date Published: 22 April 2009
PDF: 9 pages
Proc. SPIE 7300, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX, 73000Y (22 April 2009); doi: 10.1117/12.819223
Show Author Affiliations
Paul W. Nugent, Montana State Univ. (United States)
Joseph A. Shaw, Montana State Univ. (United States)

Published in SPIE Proceedings Vol. 7300:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX
Gerald C. Holst, Editor(s)

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