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Proceedings Paper

Vacuum Speckle Interferometry For Long Term Monitoring Of In-Plane Strains At Defect Sites In Nuclear Pressure Tubes
Author(s): David L. Mader; Reinhard E. Gnoyke
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Paper Abstract

Vacuum speckle interferometry can be used for long term monitoring of local deformation and strain in the vicinity of hydride blisters as they evolve on the surface of hot samples of zirconium pressure tubes used in nuclear reactors. A video camera and frame grabber were used to provide computer access to the speckle pattern for fringe pattern extraction, image processing, and data analysis. Evidence was seen for strain around the blister during thermal expansion, and for change of strain with time when heated. Decorrelation could be seen at the blister edge as it dissolved at 340 C.

Paper Details

Date Published: 10 September 1987
PDF: 8 pages
Proc. SPIE 0746, Industrial Laser Interferometry, (10 September 1987); doi: 10.1117/12.939772
Show Author Affiliations
David L. Mader, Ontario Hydro (Canada)
Reinhard E. Gnoyke, Ontario Hydro (Canada)

Published in SPIE Proceedings Vol. 0746:
Industrial Laser Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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