Evaluation of Subsurface Defects in Fiber Glass Composite Plate using Lock-in Technique
- Title
- Evaluation of Subsurface Defects in Fiber Glass Composite Plate using Lock-in Technique
- Author
- 장경영
- Keywords
- Digital Shearography; Lock-in Thermography; Lock-in Shearography; Composite plate; NDE technique
- Issue Date
- 2012-04
- Publisher
- Korean Society Precision Engineering
- Citation
- International Journal of Precision Engineering and Manufacturing, 2012, 13(4), P.465-470
- Abstract
- In this paper, the lock-in algorithm from lock-in thermography was applied in digital shearography to evaluate the subsurface defects in fiber glass composite plate. Lock-in thermography is one of active infrared thermography which is based on propagation and reflection of thermal wave while lock-in shearography is one of optical interferometric imaging technique which is based on displacement gradient changes in a fringe pattern by mechanical or thermal loading. By applying the lock-in method to digital shearography, its sensitivity can be enhanced by phase sensitive narrow-band filtering as well as the improved signal to noise ratio, selective defects detection. Artificial defects in fiber glass composite plate were evaluated by digital shearography and lock-in shearography NDE techniques to compare their detection capacity. The experimental results confirmed that lock-in method's efficiency on subsurface defects detection in composite plate specimen.
- URI
- https://link.springer.com/article/10.1007%2Fs12541-012-0061-zhttp://hdl.handle.net/20.500.11754/49041
- ISSN
- 2234-7593
- DOI
- 10.1007/s12541-012-0061-z
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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