Abstract
Thermal cameras are nowadays often used in industry and science for non-destructive thermal testing (NDTT). There have been published, by the American Society for Testing of Materials, two standards that present detailed measurement procedures of the minimum resolvable temperature difference (MRTD) and the minimum detectable temperature difference (MDTD) of commercial thermal cameras for NDTT applications. However, the standards provide only very general guidelines about the use of the measured MRTD and MDTD values for evaluation of thermal cameras for NDTT applications. Precise methods that enable evaluation of a thermal imager for NDTT application on the basis of measurement results of the MRTD and the MDTD are presented in this paper. The methods enable estimation of probabilities of detection, orientation, recognition and identification of thermal anomalies generated by flaws in the materials imaged.
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