Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"digital holography"”.
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Digital Holography and Optical Contouring
Digital holography is a technique for the recording of holograms via CCD/CMOS devices and enables their subsequent numerical reconstruction within computers, thus avoiding the photographic processes that are used in optical holography. This thesis investigates the various techniques which have been …
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Three-Dimensional Microscopy by Laser Scanning and Multi-Wavelength Digital Holography
… based on the simultaneous dual-wavelength digital holography, allows for higher axial range at which the unambiguous phase imaging can be performed. The technique is capable of nanometer axial resolution. The noise level, which increases as a result of using two wavelengths, is then reduced …
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Digital holography for exploring instabilities and breakup of liquid jets in supersonic crossflows
… in JICFs for the first time using digital in-line holography techniques. Experiments are conducted in a heated Mach 1.71 crossflow with a transitional regime liquid jet (slenderness ratio L/D of 19) with a diameter of 0.5 mm. High-speed and high-resolution digital in-line holography …
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Computational optical imaging: Applications in synthetic aperture imaging, phase retrieval, and digital holography
… is how to reconstruct phase and amplitude from a digital hologram. The typical method of applying a filter in the frequency domain is limited by finite filter size. Optimization approaches offer a solution to this problem. The work presented here spans three main aspects of phase imaging …
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Digital Hologram Image Processing
… the contributions we have made to the field of digital hologram image processing. In particular, we will deal with the processing of numerical reconstructions of real-world three-dimensional macroscopic objects recorded by in-line digital holography. Our selection of in-line digital holography …
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Improving reconstructions of digital holograms
Digital holography is a two step process of recording a hologram on an electronic sensor and reconstructing it numerically. This thesis makes a number of contri- butions to the second step of this process. These can be split into two distinct parts: A) speckle reduction in reconstructions of …
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Digital hologram recording systems: some performance improvements
… of this project is to develop methods based on digital holography for real time capture and display of 3D objects. This thesis forms a small subset of all the work done in this project. Much of the research work was aimed towards ful�lling our part of the requirements of the REAL3D project. The …
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Belęšė holografijos sistema žadinimo zondavimo eksperimentuose /
… advancement in this field was the development of holography by Dennis Gabor in 1948, which revolutionized three-dimensional imaging using coherent light sources. Despite its significance, traditional holography faced limitations due to cumbersome optical systems and analog data recording …
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Experimental transport of intensity diffraction tomography
… I compare I-DT with single-shot, Gabor-type digital holography (also integrating use of compressive sensing principles) and discuss improvements and extensions of the presented implementation of IDT.
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Dynamic holography in semiconductors and biomedical optics
… and remote imaging for big data applications. Holography is a natural approach to recording and displaying three-dimensional information because it uses phase-sensitive interferometry to record interference patterns when a reference beam encounters coherent light arriving from an object. The 3D …
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Biomedical applications of holographic microscopy
… potentially lower the computational burden of digital holography by replacing existing image reconstruction methods. We demonstrate the effectiveness of the algorithm by reconstructing biological samples and quantifying their structural similarity relative to spatial deconvolution methods. The …
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Investigation of Surface Displacements Induced in Loaded Cross-Ply Composite Laminates with Microcracking
… suggest that an optical technique such as digital holography could resolve, at a minimum, the data of [0/90/90/0], [0/90/90/90/90/0], and [0/0/90/90/90/90/0/0] laminates subjected to transverse loads of 1000 MPa.
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Modal Analysis of Millimetre-wave and Terahertz Imaging Systems
… Laguerre- Gaussian modes. The application of digital holography in the far-infra red band has the prospect of diffraction limited imaging systems without creating distortions and aberrations which is a common problem in conventional techniques using lenses and mirrors. The author presents …
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Compressible Hydrodynamics of Few Body Optical Vortices
… beams include a novel colinear phase-shifting digital holography technique using composite holograms that enables both amplitude and phase measurement of optical beams. Modal decompositions of experimentally generated fields show that our methods can yield vortex purities > 99.9% in the …
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Complex Field Analysis of Temporal and Spatial Techniques in Digital Holographic Interferometry
… concept 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 …
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Disordered insulator in an optical lattice
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-06-06T13:19:51Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Pasienski_Matthew.pdf: 17424692 bytes, checksum: bd55e794d41bd87dbf146fd3dd4617ce (MD5)
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Next Generation Phase-only LCOS Device with Ultra-low Phase Flicker for Holographic Applications
… one of the most promising optical engines for digital holographic applications. However, the system performance can be degraded by the instability of the phase levels, i.e., the so-called phase flicker. For instance, a large phase flicker means a low spatial information bandwidth for …
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Investigations of Horizontal-Parallax-Only Optical Scanning Holography (HPO-OSH) through MATLAB Simulations
… in this thesis are based on Optical Scanning Holography (OSH) aimed at acquiring HPO information electronically. The principles of OSH, a technique that allows the extraction of 3-D information by a 2-D optical scan of the object is first summarized. The HPO principles and simulation scenarios …
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Advances in Telecentric Digital Holographic Microscopy: From Theoretical Foundations to Biomedical Applications
… investigates the enhancements in telecentric digital holographic microscopy (TDHM), focusing on optimizing off-axis configurations for biomedical applications. Through a holistic approach combining hardware innovations and algorithmicadvancements, this work addresses fundamental limitations in …
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