Laser Lock-in Thermal Wave Imaging for Nondestructive Evaluation

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This paper presents a new laser lock-in thermography (LLT) technique for nondestructive evaluation. LLT utilizes a modulated continuous wave laser beam as a heat source to obtain high fidelity thermal wave images even at the presence of background heat disturbances. The thermal waves propagating along the surface and through-the-thickness directions of a structure are visualized using newly developed laser lock-in amplitude and phase images, enhancing the detectability of surface and subsurface defects. The LLT technique is numerically investigated and experimentally validated using thermal images obtained from a steel specimen with low emissivity.
Publisher
한국비파괴검사학회
Issue Date
2013-08
Language
Korean
Citation

비파괴검사학회지, v.33, no.4, pp.317 - 322

ISSN
1225-7842
URI
http://hdl.handle.net/10203/201575
Appears in Collection
CE-Journal Papers(저널논문)
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