Open AccessJournal Article
Real-time metrology with bso crystals
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TLDR
In this paper, double-exposure techniques and time average exposure were presented for real-time deformation displacement and vibration analysis and for contour line holography using a two-wavelengths method.Abstract:
Electro-optical crystals are used for real-time holography, optical data storage, optical information processing and more recently for speckle applications. Many ferro-electric materials were investigated, the Bi12 SiO20 (BSO), a cubic, para-electric and electro-optic material was found to be very useful for real-time holographic interferometry and speckle applications. For the application of the BSO in real-time metrology, the crystals is usually biased with a transverse electric field in the 110 or 100 crystallographic direction. Illuminating the crystal with spatially structured information in the 110 direction as a result of a hologram or speckle pattern, a space charge field is built up, leading to a refractive index variation in the crystal. Double-exposure techniques and time average exposure will be presented for real-time deformation displacement and vibration analysis and for contour line holography using a two-wavelengths method. Young's fringes of double-exposed, or in the time-average recorde...read more
Citations
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Applications of photorefractive crystals
TL;DR: In this paper, the authors present different suggestions for applications of photorefractive crystals and SLMs for holographic interferometry and 2D image processing, based on various phase-conjugate geometries.
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Optical methods for precision measurements: An invited paper
TL;DR: The use of a laser, solid-state detector arrays and powerful small computers leads to a very efficient fringe analysis in holography as well as in Moiré and speckle techniques as discussed by the authors.
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Phase-shifting real-time holographic interferometry that uses bismuth silicon oxide crystals
Marc Georges,Philippe Lemaire +1 more
TL;DR: It is shown that quantitative measurements are possible for low-intensity object beams (8 µW/cm(2)) and a large observed area and the temporal interferogram erasure is studied and is found weakly perturbative for the measured phase.
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Quantum holography and neurocomputer architectures
TL;DR: A novel identity is established for the matching polynomials of complete bichromatic graphs which implement the intrinsic connections between neurons of local networks located in neural layers.
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From speckle pattern photography to digital holographic interferometry [Invited]
TL;DR: The development of Speckle photography to speckle interferometry and digital holographic interferometer is described and a useful tool for displacement and deformation as well as vibration and stress analysis is described.
References
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Journal ArticleDOI
Interferometric Vibration Analysis by Wavefront Reconstruction
Robert L Powell,Karl A. Stetson +1 more
TL;DR: In this paper, a study of the Leith-Upatnieks hologram for the time average of the coherent wavefronts scattered from a vibrating object is reported, and the image reconstructed by the hologram is found to contain a system of interference fringes which map contours of constant vibration amplitude, thus providing a method of analyzing the vibration of objects with arbitrary surfaces.
Journal ArticleDOI
Multiple-Wavelength and Multiple-Source Holography Applied to Contour Generation*
TL;DR: In this article, two methods for obtaining three-dimensional holographic images containing superimposed constant-range contours for accurate cross-section tracing or contour mapping are described, and the positions of the reference sources may be optimized so that contours will appear over a maximum object angle.
Journal Article
Multiple-wavelength and multiple-source holography applied to contour generation
TL;DR: In this article, two methods for obtaining three-dimensional holographic images containing superimposed constant-range contours for accurate cross-section tracing or contour mapping are described, and the positions of the reference sources may be optimized so that contours will appear over a maximum object angle.
Journal ArticleDOI
Applications of photorefractive crystals
TL;DR: In this paper, the authors present different suggestions for applications of photorefractive crystals and SLMs for holographic interferometry and 2D image processing, based on various phase-conjugate geometries.