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NONDESTRUCTIVE EVALUATION OF PLEXIGLAS MATERIALS USING LOCK-IN AND PULSE PHASE INFRARED THERMOGRAPHY

Roberto Montanini, Salvina Aliquò
  • Abstract:
    Lock-in and pulse phase infrared thermography measurement techniques have been exploited for quantitative assessment of subsurface defects in a reference specimen made of Plexiglas. Radiometric thermal images were post-processed using a contrast approach in the frequency domain, allowing defect depth location to be resolved with a relative combined standard uncertainty of about 7% for thicknesses above 3 mm. Conversely, significant radial heat diffusion next to the boundary of the discontinuity made accurate sizing of deeper subsurface defects more difficult. The obtained results demonstrate the potentiality of active thermography as a fast, powerful contactless NDT measurement tool.
  • Keywords:
    Temperature measurements, radiometric infrared thermography, non destructive testing (NDT)
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  • DOI:
    _unreg_wc-2009.220

Event details:

  • IMEKO TC:
  • Event name:
    XIX IMEKO World Congress
  • Title:

    Fundamental and Applied Metrology

  • Place:
    Lisbon, PORTUGAL
  • Time:
    06 September 2009 - 11 September 2009