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A Three-Dimensional Interferometric Vibrational Mode Display

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When the beam from a laser vibration interferometer is optically raster scanned over a vibrating surface, a phase-sensitive detector provides velocity information at any phase of the motion. These data are digitally processed and a hard copy print gives a three-dimensional isometric view of the complete vibrating surface of the test object frozen in time.

JAES Volume 29 Issue 5 pp. 314-319; May 1981
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