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Infrared Lock-in Thermography Crack Localization on Metallic Surfaces for Industrial Diagnosis |
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| Authors: | Y Fedala M Streza F Sepulveda J-P Roger G Tessier C Boué |
| Affiliation: | 1. LPEM, ESPCI, 10 rue Vauquelin, 75005, Paris, France 2. NIR&DIMT, 65-103 Donath Street, 400293, Cluj-Napoca, Romania 3. ESPCI, Institut Langevin, UMR CNRS 7587, 1 rue Jussieu, 75005, Paris, France 4. Neurophotonics Laboratory, CNRS UMR 8250, Paris, 75006, France 5. Université Paris 5 Descartes, 45 Rue des Saints Peres, Paris, 75006, France 6. LPEM, UMR CNRS 8213, UPMC/ESPCI, 10 rue Vauquelin, 75005, Paris, France |
| 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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