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Proceedings Paper

Automatic heterodyning of fiber-optic speckle pattern interferometry
Author(s): Jesus D. R. Valera; David Harvey; Julian D. C. Jones
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Paper Abstract

The operational advantages of the complementary techniques of electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV) are combined for out-of-plane vibrational analysis. A cw laser was used in a fiberoptic system to generate time-averaged ESPI fringes. By mutual phase-locking of the ESPI and LDV signals, automatic heterodyning of the ESPI signal was achieved, together with compensation for unwanted nondeterministic out-of-plane whole body motion of the object under study. Automatic heterodyning extends the operating range of time-averaged ESPI systems to higher vibrational amplitudes, and reveals phase relationships in the object vibration. A practical demonstration of this new technique is described.

Paper Details

Date Published: 1 October 1991
PDF: 10 pages
Proc. SPIE 1508, Industrial Applications of Holographic and Speckle Measuring Techniques, (1 October 1991); doi: 10.1117/12.47102
Show Author Affiliations
Jesus D. R. Valera, Heriot-Watt Univ. (United Kingdom)
David Harvey, Heriot-Watt Univ. (United Kingdom)
Julian D. C. Jones, Heriot-Watt Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 1508:
Industrial Applications of Holographic and Speckle Measuring Techniques
Werner P. O. Jueptner, Editor(s)

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