Vacuum Speckle Interferometry For Long Term Monitoring Of In-Plane Strains At Defect Sites In Nuclear Pressure Tubes

David L. Mader; Reinhard E. Gnoyke

doi:10.1117/12.939772

10 September 1987 Vacuum Speckle Interferometry For Long Term Monitoring Of In-Plane Strains At Defect Sites In Nuclear Pressure Tubes

David L. Mader, Reinhard E. Gnoyke

Author Affiliations +

Proceedings Volume 0746, Industrial Laser Interferometry; (1987) https://doi.org/10.1117/12.939772
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

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.

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David L. Mader and Reinhard E. Gnoyke "Vacuum Speckle Interferometry For Long Term Monitoring Of In-Plane Strains At Defect Sites In Nuclear Pressure Tubes", Proc. SPIE 0746, Industrial Laser Interferometry, (10 September 1987); https://doi.org/10.1117/12.939772

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