Thermal-Imaging System Performance Measures For Nondestructive Testing

Julius Cohen

doi:10.1117/12.939158

27 March 1984 Thermal-Imaging System Performance Measures For Nondestructive Testing

Julius Cohen

Proceedings Volume 0446, Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control; (1984) https://doi.org/10.1117/12.939158
Event: Thermal Infrared Sensing for Diagnostics and Control: Thermosense VI, 1983, Oak Brook, United States

Abstract

Thermal images result from temperature differences and/or emissivity differences (apparent temperature differences) in a scene or target. It is the function of a thermal-imaging system to reproduce an acceptable visible image of the scene or target from its thermal content. Thus, a thermal-imaging system is required to resolve spatial differences of temperature and emissivity. The performance of a thermal-imaging system may be specified by means of the fundamental performance measures, noise-equivalent temperature difference (NEAT), minimum-resolvable temperature difference (MRTD), and/or minimum detectable temperature difference (MDTD). Noise-equivalent temperature difference is a convenient measure of an imaging system's thermal sensitivity to a broad-area target (extended source); however, by itself it is no indicator of imaging capability. On the other hand, both minimum-resolvable temperature difference and minimum-detectable temperature difference address the imagery, which includes the human factor; i.e., the image observer. Thus, MRTD is a measure of the compound system-observer capability to spatially resolve temperature differences in a standard periodic-bar target by observing its display on a video monitor. The minimum-detectable temperature difference is similar to the MRTD, except the target geometry differs in being an aperiodic square. The measurement and the significance of each of these performance measures is discussed.

Citation Download Citation

Julius Cohen "Thermal-Imaging System Performance Measures For Nondestructive Testing", Proc. SPIE 0446, Thermosense VI: Thermal Infrared Sensing for Diagnostics and Control, (27 March 1984); https://doi.org/10.1117/12.939158

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KEYWORDS

Temperature metrology

Minimum resolvable temperature difference

Imaging systems

Modulation transfer functions

Spatial frequencies

Thermography

Black bodies

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