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22 April 2009 Large-area blackbody emissivity variation with observation angle
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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°.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul W. Nugent and Joseph A. Shaw "Large-area blackbody emissivity variation with observation angle", Proc. SPIE 7300, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX, 73000Y (22 April 2009);

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