Evaluation of Subsurface Defects in Fiber Glass Composite Plate using Lock-in Technique
- Authors
- Kim, Ghiseok; Hong, Soonsung; Kim, Geon Hee; Jhang, Kyung-Young
- Issue Date
- Apr-2012
- Publisher
- KOREAN SOC PRECISION ENG
- Keywords
- Digital Shearography; Lock-in Thermography; Lock-in Shearography; Composite plate; NDE technique
- Citation
- INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v.13, no.4, pp.465 - 470
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
- Volume
- 13
- Number
- 4
- Start Page
- 465
- End Page
- 470
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/165930
- DOI
- 10.1007/s12541-012-0061-z
- ISSN
- 2234-7593
- 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.
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