Photoacoustic phase signatures of closed cracks
- 1 February 1982
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 53 (2), 1258-1260
- https://doi.org/10.1063/1.330544
Abstract
The photoacoustic phase signatures of closed cracks are calculated and compared with experimental observations. The differential signals from near subsurface lateral cracks are advanced in phase by 45° with respect to the background signal, in contrast to the 45° lag in phase observed for a near lower surface step.Keywords
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