Holographic interferometry using photorefractive crystals: recent advances and applications

Marc P. Georges; Philippe C. Lemaire

doi:10.1117/12.250732

18 September 1996 Holographic interferometry using photorefractive crystals: recent advances and applications

Marc P. Georges, Philippe C. Lemaire

Proceedings Volume 2782, Optical Inspection and Micromeasurements; (1996) https://doi.org/10.1117/12.250732
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

We present a real-time holographic interferometer using sillenite crystals for measurement of deformations of large diffusive objects. Two kinds of optical heads have been investigated: a first system with a frontal crystal followed by a CCD camera with a short focal length objective, and a second system with imaging objective in front of the crystal, collecting light and imaging the object in its vicinity, the final image being observed with a second relay imagery. Both systems are compared with respect to their temporal behavior and quality of interferograms. This interferometer is connected with quantitative phase- measurement systems. First, phase-shifting (PS) can be performed by translating a mirror in the reference beam, enabling acquisition of several interferograms subsequently processed leading to the object phase deformation. Nevertheless this requires stability of the object during the shifting process. Second, Fourier transform (FT) processing can be used on a single interferogram. This interferometer has been successively used in different applications: detection of defects in weakly disturbed structures using PS and monitoring of thermal deformation of an object with FT.

Citation Download Citation

Marc P. Georges and Philippe C. Lemaire "Holographic interferometry using photorefractive crystals: recent advances and applications", Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); https://doi.org/10.1117/12.250732

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