Shearography is a laser interferometric method developed originally for full field observation of surface strains of components. Since flaws usually induce strain concentrations around them, shearography can be employed to detect the flaws. Conventional shearography involves exposing high resolution films before and after the components are loaded. The exposed films are developed and then viewed via a high-pass filtering optical setup. Though the images obtained are good, this method is time-consuming. With the advent of high-speed computers, associated sophisticated imaging hardware and software, the Digital Speckle Shearing Interferometry (DSSI) method which employs a CCD (charged-coupled device) camera and computer image processing to produce the interferometric fringe patterns has been developed. In contrast with the conventional shearography, the electronic version does not require any film and is faster. The techniques are used to detect and characterise (a) flaws simulating delaminations in composites and (b) thinning in pipes.
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ASME 1997 Turbo Asia Conference
September 30–October 2, 1997
Singapore
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7867-5
PROCEEDINGS PAPER
Flaw Detection and Characterization Using Shearography
Siew-Lok Toh,
Siew-Lok Toh
National University of Singapore, Singapore
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Fook-Siong Chau
Fook-Siong Chau
National University of Singapore, Singapore
Search for other works by this author on:
Siew-Lok Toh
National University of Singapore, Singapore
Fook-Siong Chau
National University of Singapore, Singapore
Paper No:
97-AA-063, V001T13A039; 6 pages
Published Online:
December 30, 2014
Citation
Toh, S, & Chau, F. "Flaw Detection and Characterization Using Shearography." Proceedings of the ASME 1997 Turbo Asia Conference. ASME 1997 Turbo Asia Conference. Singapore. September 30–October 2, 1997. V001T13A039. ASME. https://doi.org/10.1115/97-AA-063
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