17 July 1996 Actively phase-compensated portable fiber optic electronic speckle pattern interferometer (ESPI) for long-term in-situ measurements
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Abstract
The design and performance of an actively phase-compensated fiber-optic speckle pattern interferometer (ESPI) is presented. Due to its portability, illuminating beam flexibility and lightweight design it provides an alternative to standard bulk-optics FSPI systems for many applications. Phase stabilization allows for long-term measurements up to several days. In addition, the provided phase stepping uses the four-step algorithm, is self calibrating, and can be performed at quasi video rate. The use of all highly birefringent fiber-optics components ensures linearly polarized light for the illuminating beams under all operating conditions.
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Alexander Brozeit, Alexander Brozeit, Klaus D. Hinsch, Klaus D. Hinsch, } "Actively phase-compensated portable fiber optic electronic speckle pattern interferometer (ESPI) for long-term in-situ measurements", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); doi: 10.1117/12.276300; https://doi.org/10.1117/12.276300
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