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Showing 1 to 18 of 18 for “"holographic interferometry"”.
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Complex Field Analysis of Temporal and Spatial Techniques in Digital Holographic Interferometry
… of complex phasor method to process the digital holographic interference phase maps in complex field is proposed. Based on this concept, three temporal phase retrieval algorithms and one spatial retrieval approach are developed. Temporal complex phasor method is highly immune to noise and allows …
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Measurement of Change of Thickness for a Thin Plate by Holographic Interferometry
Made available in DSpace on 2014-12-12T00:25:58Z (GMT). No. of bitstreams: 1 7511859.pdf: 1624412 bytes, checksum: 881ef135a6213ff616cb24ce500bfa94 (MD5) Previous issue date: 1974
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Spatial Fringe Analysis Methods and their Application to Holographic Interferometry and Fringe Projection Techniques
… of displacement, strain and curvature in digital holographic interferometry and the measurement of 3D shape, temporal evolution of deformation and/or strain in fringe projection techniques.
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Use of Holographic Interferometry to Determine the Surface Displacement Components of a Deformed Body
Made available in DSpace on 2014-12-12T00:25:48Z (GMT). No. of bitstreams: 1 7212349.pdf: 1909131 bytes, checksum: 9a80f3bb2662eeaf36580cd655bf2949 (MD5) Previous issue date: 1971
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Holographic determination of mechanical properties and behaviour of materials
… and development of experimental procedures using holographic interferometry to determine different material properties such as: i) Modulus of Elasticity (E) ii) Poisson's ratio (v) (which included a study into the Modulus of Rigidity. (G)) iii) creep behaviour at room temperature. The Elastic …
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Aspects of holography
… areas of importance, namely: i) qualitative holographic nondestructive testing, as applicable to flaw detection, ii) quantitative holographic interferometry and iii) white-light transfer reflection holography, with particular emphasis on the multiplexing principle. The objects used to …
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A qualitative holographic study of hemipelvic and acetabular deformation caused by different hip prostheses
… The experimental method employed was real-time holographic interferometry, a stress analysis technique recently used in the biomechanical field, which permitted whole-field simultaneously inspection of deformation patterns. The holographic interferograms were interpreted in a qualitative rather …
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Design procedures for high temperature components using finite element methods
… sophisticated non-destructive testing technique, Holographic Interferometry, are employed to investigate flaws and failure modes. The technique developed enables the qualification and quantification of material properties and flaws for in situ components. The dominant failure mode for the kiln is …
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Design of a non-contact vibration measurement and analysis system for electronic board testing
… three optically based concepts were explored: holographic interferometry, area scaling, and displacement sensor grid. Through concept testing and analysis, the displacement sensor grid method was chosen for the design. The final system incorporates four laser displacement sensors with a …
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Dynamics of circular cylindrical shells in contact with fluid.
… applying the FE method (ANSYS) and carrying out holographic tests, it is found that the structural frequencies for n=l are most strongly influenced by the water level. For shells of equal radii, equal filling ratios and different other parameters, the liquid-related reduction in frequency for …
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An experimental and finite element analysis of the thermal deformation of an open sleeve piston
… diesel engine piston using finite elements and holographic interferometry. As a result of the complexity of the piston design and the unknown in-built stresses certain assumptions were necessary in the generation of the finite elements model. By using the holographic technique for direct …
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Moiré interferometry for out-of-plane displacement measurements
Moiré interferometry is a relatively new branch of photomechanics that utilizes a diffraction grating on the specimen to determine surface displacements. To date, it has been used primarily to determine in-plane displacements of the specimen surface. The objective of this work is to demonstrate …
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Probing ultra-subwavelength inhomogeneities embedded within dielectric targets using photonic nanojets
The use of optics to detect ultra-subwavelength features embedded within structures is a hot topic for a broad diversity of applications like spectroscopy, nanotechnology, microscopy, and optical data storage discs. Conventional objective lens based optical systems have a fundamental limit on the …
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Development of methodologies for the assessment of oral prostheses.
… system used for cyclic load testing. The use of Holographic Interferometry to assess the displacement levels was also investigated, but due to the limitations of the technique did not give any substantial additional support of the findings, however a description of the technique and results is …
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Improving the Three Dimensional, Structural Velocity Field Reconstruction Process with Computer Vision
… field, analytical techniques developed for holographic interferometry are extended and applied to SLDV velocity images. Specifically, the "absolute" and "relative" fringe-order methods are used to reconstruct the velocity field with the "best" set of bases. Full and partial least squares …
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Dynamic holography in semiconductors and biomedical optics
… information because it uses phase-sensitive interferometry to record interference patterns when a reference beam encounters coherent light arriving from an object. The 3D information is contained in the values of wave optics. Holography is a broad field that goes beyond recording and …
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DEVELOPMENT OF PHASE RETRIEVAL TECHNIQUES IN DISPLACEMENT AND DISPLACEMENT DERIVATIVES MEASUREMENT
… a single fringe pattern. In time-average speckle interferometry, novel amplitude varied refreshing reference frame technique is proposed to improve the contrast and visibility of a Bessel fringe pattern. A novel ensemble of hybrid genetic algorithm for two-dimensional phase unwrapping method, is …
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Three-Dimensional Microscopy by Laser Scanning and Multi-Wavelength Digital Holography
This dissertation presents techniques of three-dimensional microscopy. First, an economical method of microscopic image formation that employs a raster-scanning laser beam focused on a sample, while non-imaging detector receives the scattered light is presented. The images produced by this method …