Stroboscopic real-time holographic interferometry with photorefractive crystals applied to modal analysis

Marc P. Georges; Philippe C. Lemaire

doi:10.1117/12.281166

17 September 1997 Stroboscopic real-time holographic interferometry with photorefractive crystals applied to modal analysis

Marc P. Georges, Philippe C. Lemaire

Author Affiliations +

Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281166
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany

Abstract

A breadboard holographic interferometer that uses a photorefractive sillenite crystal under the anisotropic diffraction configuration is presented for application of quantitative vibration measurements. After the hologram of the object at the rest is recorded, a stroboscope is used to observe the stable pattern of the vibrating object and phase-shifting is introduced for quantitative measurements. It is shown that this system can measure modal displacements of objects of typically 25 X 25 cm² with high accuracy by using a continuous YAG laser emitting 490 mW at 532 nm. The error sources are investigated and particularly a systematic error arising from the stroboscopic process can be calculated and eliminated.

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Marc P. Georges and Philippe C. Lemaire "Stroboscopic real-time holographic interferometry with photorefractive crystals applied to modal analysis", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); https://doi.org/10.1117/12.281166

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