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

Arao Kamoi, Yoshizo Okamoto, Vladimir Vavilov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


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 objects under test by warming up or cooling down the object 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 software 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 measured by ourselves for the first time are of a little help while evaluating detection limits.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsK.E. Cramer, X.P. Maldague
Number of pages6
Publication statusPublished - 2003
EventThermosense XXV - Orlando, FL, United States
Duration: 22 Apr 200324 Apr 2003


OtherThermosense XXV
CountryUnited States
CityOrlando, FL


  • Buried object
  • Detection limit
  • Infrared radiometer
  • IR camera
  • MKTD
  • Remote sensing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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