Abstract
IR emission patterns for a series of cylindrical holes milled into aluminum and steel plates were compared with those predicted from existing theory. The emission patterns were found to be influenced by the hole geometry, the substrate material and the IR camera system itself. For holes milled into an aluminum plate, the results were adequately explained by existing theory for diffuse materials. For holes milled into a steel plate, however, this theory was found not to apply and empirical calibration was required. It is concluded that the IR technique may have promise in characterizing the diameter and depth of milled holes at temperatures near ambient.
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