CHARACTERIZATION OF PERIODIC CYLINDRICAL SUBSURFACE DEFECTS BY PULSED FLASH THERMOGRAPHY

Goran Dikić (), Ljubiša Tomić (), Vesna Damnjanović () and Bojan Milanović ()
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Goran Dikić: Military Academy, University of Defence, Pavla Jurišića Šturma 33, Belgrade 11000, Serbia
Ljubiša Tomić: Technical Test Center, Serbian Armed Forces, Vojvode Stepe 445, Belgrade 11000, Serbia
Vesna Damnjanović: Faculty of Mining and Geology, University of Belgrade, Djušina 7, Belgrade 11000, Serbia
Bojan Milanović: Military Academy, University of Defence, Pavla Jurišića Šturma 33, Belgrade 11000, Serbia

Surface Review and Letters (SRL), 2015, vol. 22, issue 02, 1-11

Abstract: A characterization of cylindrical periodic subsurface defects of different sizes by means of pulsed thermography is presented in the paper. To ensure a uniform thermal flux distribution, the test samples were heated in lab conditions using two photographic flashes. Surface temperature was intentionally recorded at an angle to the normal of the sample surface. Recorded temperatures were compared with simulated temperatures and the differences in temperature peak values and temperature peak positions were noted. The thermal image was transformed based on known positions of four noncollinear points, in order to cancel out errors resulting from image recording at an angle. The uniformity of surface heating and the effect of the positions of the defects on the results were tested by means of a simulation model. The positions did not affect defect characterization. It was also found that in spite of nonuniform heating, if the reference points were selected properly, the difference in temperature contrast was negligible.

Keywords: Temperature contrast; uniform heating; camera angle; cylindrical subsurface defects; image transformation; temperature depth dependence; 3D FEM; active infrared thermography; pulsed flash thermography; nondestructive testing; thermal images; MATLAB; cp2tform; imtransform (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500328

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