Abstract
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.
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Acknowledgements
This work was supported by the “Pôle ASTech” and the “Pôle Nucléaire de Bourgogne”, and has been funded by the Ville de Paris, France.
The authors would like to thank Areva Intercontrole, Turbine Casting and SAFRAN (Snecma) for providing us the industrial components.
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Fedala, Y., Streza, M., Sepulveda, F. et al. Infrared Lock-in Thermography Crack Localization on Metallic Surfaces for Industrial Diagnosis. J Nondestruct Eval 33, 335–341 (2014). https://doi.org/10.1007/s10921-013-0218-4
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DOI: https://doi.org/10.1007/s10921-013-0218-4