Minimum radiation temperature difference and detection limit of flaws by means of an infrared radiometer

Arao Kamoi; Yoshizo Okamoto; Osamu Makishi

doi:10.1117/12.342325

19 March 1999 Minimum radiation temperature difference and detection limit of flaws by means of an infrared radiometer

Arao Kamoi, Yoshizo Okamoto, Osamu Makishi

Proceedings Volume 3700, Thermosense XXI; (1999) https://doi.org/10.1117/12.342325
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

The infrared detection method has been carried out to detect the invisible flaw existing in a medium by observing a transient phase difference of a radiation temperature difference of deterioration parts and invisible flaws using the infrared radiometer. In order to evaluate the detection limit of the flaw using the infrared radiometer, it is important to confirm resolution characteristics of the radiometer like noise equivalent temperature difference NETD, minimum detectable temperature difference MDTD and minimum resolvable temperature difference MRTD under jurisdiction of ASTM, JIS and so on. However, the detection limit of the flaw displayed in the CRT of the radiometer is determined by the function of those values and surface radiation characteristics like emissivity, reflectivity and their spatial variance of the material and flaws used. The paper represents experimental and numerical results on the relation between the detection limit of the flaw and resolution characteristics of the radiometer itself.

Citation Download Citation

Arao Kamoi, Yoshizo Okamoto, and Osamu Makishi "Minimum radiation temperature difference and detection limit of flaws by means of an infrared radiometer", Proc. SPIE 3700, Thermosense XXI, (19 March 1999); https://doi.org/10.1117/12.342325

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