Automatic heterodyning in fiber optic speckle pattern interferometry   using laser velocimetry

Jesus D. R. Valera; David Harvey; Julian D. C. Jones

doi:10.1117/12.58843

1 August 1992 Automatic heterodyning in fiber optic speckle pattern interferometry using laser velocimetry

Jesus D. R. Valera, David Harvey, Julian D. C. Jones

Author Affiliations +

Optical Engineering, Vol. 31, Issue 8, (August 1992). https://doi.org/10.1117/12.58843

Abstract

We combine the operational advantages ofthe complementary techniques of electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV) for out-of-plane vibrational analysis. A cw laser was used in a fiber optic 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 (i.e., without operator intervention) 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 the technique is described.

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Jesus D. R. Valera, David Harvey, and Julian D. C. Jones "Automatic heterodyning in fiber optic speckle pattern interferometry using laser velocimetry," Optical Engineering 31(8), (1 August 1992). https://doi.org/10.1117/12.58843

Published: 1 August 1992

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