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Ultrasonic wave measurement by differential interferometry

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Abstract

The theory and performance of a two beam differential interferometer for measurement of both surface and bulk waves are described. The system is insensitive to small errors (<1 mm) in focus or in specimen flatness. Both amplitude and phase measurements are demonstrated. The system has been absolutely calibrated and can detect 6 × 10−4 Å surface wave displacements on glass.

© 1977 Optical Society of America

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