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Characterization Of Periodic Cylindrical Subsurface Defects By Pulsed Flash Thermography

Author

Listed:
  • 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)

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.

Suggested Citation

  • Goran Dikić & Ljubiša Tomić & Vesna Damnjanović & Bojan Milanović, 2015. "Characterization Of Periodic Cylindrical Subsurface Defects By Pulsed Flash Thermography," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 22(02), pages 1-11.
    • Handle: RePEc:wsi:srlxxx:v:22:y:2015:i:02:n:s0218625x15500328
    DOI: 10.1142/S0218625X15500328
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