Detection of Shape and Depth of Defects in Aluminum Structures Using SQUIDS
- Christopher Newport University, Newport News, Virginia 23606 (United States)
- NASA Langley Research Center, Hampton, VA 23681 (United States)
- Lockheed Martin Space Operation, Hampton, VA 23681 (United States)
We have developed a low temperature SQUID measurement system for detection of defects deep under the surface of aluminum structures using eddy current techniques. The system uses an orthogonal planar inducer with two different excitation frequencies. We have also developed a data analysis software that enabled us to distinguish between round objects (fastener holes), straight defects (cracks) and cracks close to holes simulating cracks around fasteners in aluminum structures. We were able to detect defects that are 8mm below the surface. We have also measured the change in phase of the detected signal as a function of depth of the defect. This relationship can be used to determine the depth of hidden flaws. A similar system using High Temperature SQUID with better spatial resolution was also able to detect cracks close to fastener holes in layered aluminum sample.
- OSTI ID:
- 20655354
- Journal Information:
- AIP Conference Proceedings, Vol. 760, Issue 1; Conference: Conference on review of progress in quantitative nondestructive evaluation, Golden, CO (United States), 25-30 Jul 2004; Other Information: DOI: 10.1063/1.1916866; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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