20 March 1997 Phase-shifting dynamic holographic interferometry using BSO photorefractive crystals
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Proceedings Volume 2921, International Conference on Experimental Mechanics: Advances and Applications; (1997) https://doi.org/10.1117/12.269808
Event: International Conference on Experimental Mechanics: Advances and Applications, 1996, Singapore, Singapore
Abstract
Holographic interferometry of phase objects as well as diffusely scattering opaque specimens is achieved in quasi real-time using two-wave mixing in photorefractive Bi12SiO20 (BSO) crystals. In the case of diffusely scattering specimens, phase shifting holographic interferometry of a vibrating plate specimen is done by recording at least 3 double pulse holograms with different phase shifts of the reference beam. The good signal-to-noise ratio and resolution of the resulting holographic interferograms enable phase measurement of complex vibration modes. Quasi-heterodyne interferometry is also demonstrated for phase objects under non-recurring loading. A double exposure hologram with two separate reference beams at different incident angles for the two exposures is recorded in a BSO crystal. The two recorded object states are subsequently reconstructed by the reference beams at any desired phase by simply introducing a relative phase shift between the two readout reference beams. Because of the speed of the photorefractive effect and the lack of need for post processing, such a recording material allows image acquisition comparable in temporal resolution to electronic speckle techniques with the image quality of classical holography.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bruno F. Pouet, Bruno F. Pouet, Sridhar Krishnaswamy, Sridhar Krishnaswamy, } "Phase-shifting dynamic holographic interferometry using BSO photorefractive crystals", Proc. SPIE 2921, International Conference on Experimental Mechanics: Advances and Applications, (20 March 1997); doi: 10.1117/12.269808; https://doi.org/10.1117/12.269808
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