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16 September 2011 Testing of highly accurate blackbodies
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Abstract
Many organizations, including Space Dynamics Laboratory, have built blackbodies with calculated emissivities of 0.995 to 0.9999 and estimated radiance temperature uncertainties of a few hundred mK or less. However, the calculated performance has generally not been demonstrated through testing or comparison with other highperformance blackbodies. Intercomparison is valuable; historically, when equipment or experimental results have been intercompared they are often found to disagree by more than the claimed uncertainties. Blackbody testing has been limited because testing at the required accuracy (0.1% or better in radiance) is a significant expense. Such testing becomes essential when proven, SI-traceble, absolute accuracy is required, such as for the CLARREO mission which has an absolute accuracy requirement of 0.1 K (3 sigma) at 220 K over most of the thermal infrared and needs high-performance blackbodies to support this requirement. Properly testing blackbodies requires direct measurement of emissivity and accurate measurement of radiance or comparison of radiance from two blackbodies. This presentation will discuss these testing needs, various types of testing, and test results for a CLARREO prototype blackbody.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harri Latvakoski, Michael Watson, and Shane Topham "Testing of highly accurate blackbodies", Proc. SPIE 8154, Infrared Remote Sensing and Instrumentation XIX, 815404 (16 September 2011); https://doi.org/10.1117/12.895985
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