Journal of Nondestructive Evaluation

, Volume 33, Issue 3, pp 335–341 | Cite as

Infrared Lock-in Thermography Crack Localization on Metallic Surfaces for Industrial Diagnosis

  • Y. Fedala
  • M. Streza
  • F. Sepulveda
  • J.-P. Roger
  • G. Tessier
  • C. Boué


Optical lock-in thermography with a modulated laser excitation is used for the qualitative assessment of surface cracks in metallic samples. In order to identify and localize an open defect, a novel dedicated image processing of the recorded IR amplitude sequence is proposed. The obtained results demonstrate the potentiality of active lock-in thermography as a contactless measurement tool for the localization of breaking cracks located into specific regions difficult to reach by other conventional non-destructive testing (NDT) techniques such as eddy currents or ultrasound techniques. Crack localization without a prior preparation of the inspected surface can be a possible alternative to penetrant inspection in industrial processes. Various applications illustrating the proposed procedure are presented.


Infrared thermography Lock-in thermography Non-destructive testing Crack localization 


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Y. Fedala
    • 1
  • M. Streza
    • 1
    • 2
  • F. Sepulveda
    • 1
  • J.-P. Roger
    • 3
  • G. Tessier
    • 3
    • 4
    • 5
  • C. Boué
    • 6
  1. 1.LPEMESPCIParisFrance
  2. 2.NIR&DIMTCluj-NapocaRomania
  3. 3.ESPCI, Institut LangevinUMR CNRS 7587ParisFrance
  4. 4.Neurophotonics LaboratoryCNRS UMR 8250ParisFrance
  5. 5.Université Paris 5 DescartesParisFrance
  6. 6.LPEM, UMR CNRS 8213UPMC/ESPCIParisFrance

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