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Quantitative evaluation of speckle correlation fringes from a flat rotating specimen

This paper describes a system based upon electronic speckle pattern interferometry (ESPI) for the measurement of in-plane radial strains on rotating specimens. Repeatable fringe patterns are obtained over a wide range of rotational speeds, and analyzed using the Fourier transform method. Radial strain data, extracted from the unwrapped phase fields, is compared with an established theory, and demonstrates a good agreement.