Studying the inspection limits in detecting buried objects by using  infrared thermography

Arao Kamoi; Yoshizo Okamoto; Vladimir P. Vavilov

doi:10.1117/12.487450

1 April 2003 Studying the inspection limits in detecting buried objects by using infrared thermography

Arao Kamoi, Yoshizo Okamoto, Vladimir P. Vavilov

Proceedings Volume 5073, Thermosense XXV; (2003) https://doi.org/10.1117/12.487450
Event: AeroSense 2003, 2003, Orlando, Florida, United States

Abstract

In Japan it happens that building parts made of concrete suddenly collapse to create obstacles to the traffic in tunnels, on highways and bridges. Thus, the safety issue has become a serious social problem. Therefore, the detection of hidden defects in concrete building constructions in order to prevent an accidental damage is the important application area for nondestructive testing (NDT) techniques. Until now, the inspection is typically performed by using a hammer that is subjective and takes too much time. Infrared thermography is a promising NDT technique that might help in the fast detection of invisible (hidden) defects. Transient, or active, thermal NDT requires external thermal stimulation of the defects under test by warming up or cooling down the defect surface. However, low-power and long heating is significantly affected by environmental conditions. Recent Japanese research in this area has been rather qualitative, i.e. without putting the accent on evaluating parameters of hidden defects. In this study, the experimental results are modeled and processed by using the thermal NDT package developed at the Tomsk Institute of Introscopy. This has allowed not only optimizing test parameters but also obtaining reasonable estimates of defect parameters for air-filled voids and inclusions in concrete. It is shown that MRTD values experimented by us are of a little help while evaluating detection limits.

Citation Download Citation

Arao Kamoi, Yoshizo Okamoto, and Vladimir P. Vavilov "Studying the inspection limits in detecting buried objects by using infrared thermography", Proc. SPIE 5073, Thermosense XXV, (1 April 2003); https://doi.org/10.1117/12.487450

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