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Tesis sobre el tema "Digital holography"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 25 de julio de 2025

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1

Williams, Logan Andrew. "Digital Holography for Three Dimensional Tomographic and Topographic Measurements." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1398436841.

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2

Hjartarson, Örn. "Separation of lobes in Multispectral Digital Holography." Thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-64314.

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Through a holographic recording a property from the third dimension, the depth, is obtained in the form of a phase map of the incident light. One wavelength holography will have a unique phase for the depth range corresponding to the wavelength of the light and outside this range the real depth can not be resolved. By introducing more wavelengths to the measurement the unique phase combination of the waves will have a wider range and larger objects can be resolved. Up to six wavelengths can be simultaneous recorded by making them occupy different spatial frequencies. A set of spatial frequenci
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3

Tapsell, John Peter. "Direct-Write Digital Holography." Thesis, University of Sussex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487902.

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Chapter 1 gives a brief history of the field of holography along with an overview of this thesis. A more detailed description of holography is provided in Chapter 2 along with a discussion of digital holography. Chapter 3 examines the design of a one-step monochromatic hologram printer capable producing white-light viewable transmission holograms created with the aid of an LCOS display system and printed in a dot-matrix sequence. The lens system employed includes a microlens array and an afocal relay telescope which are both quantitatively examined in order to maximise the contrast, diffractio
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4

Lopez, Marcio André Prieto Aparicio. "Microscopia holográfica digital aplicada na análise de tecidos biológicos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-23032013-124944/.

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Este trabalho teve como objetivo a aplicação do Microscópio Holográfico Digital para análise de amostras biológicas, por meio de imagens de parâmetros físicos e informação quantitativa de uma amostra, gerados através de hologramas digitais, o que não ocorre na holografia clássica. O processamento e análise dos hologramas digitais foi efetuada por um programa escrito por meio do software MatLab, empregando o método de Dupla Propagação. São explicados outros métodos para tratamento de hologramas digitais, presentes no programa. O método de Dupla Propagação foi discutido, destacando suas vantagen
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5

Li, Yan. "Digital holography and optical contouring." Thesis, Liverpool John Moores University, 2009. http://researchonline.ljmu.ac.uk/4539/.

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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 developed for digital holography. It develops and successfully demonstrates a number of refinements and additions in order to enhance the performance of the method and extend its applicability. The thesis contributes to both the experimental and numerical analysis aspects of digital holography. Rega
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6

Mann, Christopher J. "Quantiative biological micrsocopy by digital holography." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001709.

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7

Mann, Christopher J. "Quantiative biological microsocopy by digital holography." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/2614.

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In this dissertation, improved techniques in digital holography, that have produced high-resolution, high-fidelity images, are discussed. In particular, the angular spectrum method of calculating holographic optical field is noted to have several advantages over the more commonly used Fresnel transformation or Huygens convolution method. It is observed that spurious noise and interference components can be tightly controlled through the analysis and filtering of the angular spectrum. In the angular spectrum method, the reconstruction distance does not have a lower limit, and the off-axis angle
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8

Dong, Hongpai. "Applications and developments of digital holography." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430382.

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Digital holography is a new technology emerged in 1994. Because of developments of Laser, personal computer, and CCD sensor, digital holography is finding a remarkably wide range for applications. The reconstruction algorithm is the corner stone of digital holography. It simulates and models the optical reconstruction process with numerical algorithms. A number of reconstruction algorithms have been developed for digital holography in recent years, for instance, the digital implementations of the Fresnel transform, the Fraunhofer transform, and Wavelet transform. We examined all above reconstr
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9

Khodadad, Davood. "Multiplexed Digital Holography incorporating Speckle Correlation." Doctoral thesis, Luleå University of Technology, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-55810.

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In manufacturing industry there is a high demand for on line quality control to minimize therisk of incorrectly produced objects. Conventional contact measurement methods are usuallyslow and invasive, meaning that they cannot be used for soft materials and for complexshapes without influencing the controlled parts. In contrast, interferometry and digitalholography in combination with computers become faster, more reliable and highly accurateas an alternative non-contact technique for industrial shape evaluation. For example in digitalholography, access to the complex wave field and the possibi
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10

Suck, Sarah Yasmine. "Digital heterodyne holography for plasmonic nanostructures." Paris 6, 2011. http://www.theses.fr/2011PA066681.

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Dans cette thèse, nous étudions les caractéristiques de diffusion de nanostructures plasmoniques tout en adaptant et améliorant l'holographie hétérodyne numérique, qui est une technique d'imagerie plein champ pour mesurer en trois dimensions le diagramme de rayonnement. En outre, nous avons effectué de nombreuses mesures spectroscopiques pour enregistrer les spectres de diffusion de nanoobjets uniques. Afin d'obtenir une compréhension plus profonde des caractéristiques du champ diffusé que nous mesurons, nous avons développé un modèle numérique basé sur la méthode des éléments finis. Ce modèle
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11

Talukdar, Sumanta. "Microstereolithography implemented via visible light digital holography." Thesis, University of Sussex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404209.

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The amalgamation of the technologies of Microfabrication and Rapid Prototyping and Manufacturing is a field that has witnessed a surge of research activity in recent years. This thesis demonstrates the development of a novel microfabrication system characterised by the use of Computer Generated Holograms (CGHs) as part of a StereoLithographic rapid prototyping system in cohesion with applied microfabrication techniques. CGHs are reconstructed using a laser diode operating at a visible wavelength (407nm) and subsequently implemented in the fabrication of a microstructure. The hologram encoding
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12

Claus, Daniel. "Resolution improvement methods applied to digital holography." Thesis, University of Warwick, 2010. http://wrap.warwick.ac.uk/47211/.

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This thesis discusses the creation, acquisition and processing of digital holograms. Several techniques to improve the optical resolution have been investigated and developed. The optical resolution of numerically reconstructed digital holograms is restricted by both the sampling frequency and the overall sensor-size of the digital camera chip used. This thesis explores the limitations on the optical resolution of the holograms obtained. A typical sensor-size and sampling frequency for digital holograms is 10 mm and 100 lp/mm, respectively, whereas holographic plates used for optical holograph
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13

Czarske, Jürgen W., Nektarios Koukourakis, Bob Fregin, Jörg König, and Lars Büttner. "Adaptive flow-field measurements using digital holography." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A35119.

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Variations of the optical detection path-length in image correlation based flow-field measurements result in strong errors in position allocation and thus lead to a strong enhancement of the measurement uncertainty of the velocity. In this contribution we use digital holography to measure the wavefront distortion induced by fluctuating phase boundary, employing spatially extended guide stars. The measured phase information is used to correct the influence of the phase boundary in the detection path employing a spatial light modulator. We analyze the potential of guide stars that are reflected
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14

Li, Peiyun. "Suppression of Moire Patterns in Digital Holography." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1449273439.

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15

Amer, Eynas. "Pulsed laser ablation studied using digital holography." Doctoral thesis, Luleå tekniska universitet, Strömningslära och experimentell mekanik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18194.

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Pulsed digital holographic interferometry has been used to study the plume and the shock wave generated in the laser ablation process on different targets under atmospheric air pressure. A pulsed Nd-YAG laser system (pulse duration 12 ns) has been used both for ablating the material (wavelength 1064 nm) and for measurement (wavelength 532 nm). Digital holograms were recorded for different time delays using collimated laser light passed through the volume along the target. Numerical data of the integrated refractive index field were calculated and presented as phase maps. The Radon inversion ha
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16

Amer, Mohamed Eynas. "Pulsed laser ablation studied using digital holography /." Luleå : Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/3315450.

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17

Parshall, Daniel. "Phase imaging digital holography for biological microscopy." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000285.

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18

Schockaert, Cédric. "Three dimensional object analysis and tracking by digital holography microscopy." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210718.

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Digital Holography Microscopy (DHM) is a new 3D measurement technique that exists since Charge Coupled Devices (or CCD cameras) allow to record numerically high resolution images. That opens a new door to the theory of holography discovered in 1949 by Gabor: the door that masked the world of digital hologram processing. A hologram is a usual image but that contains the complex amplitude of the light coded into intensities recorded by the camera. The complex amplitude of the light can be seen as the combination of the energy information (squared amplitude modulus) with the information of the pr
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19

Okman, Osman Erman. "Quantization Index Modulation Based Watermarking Using Digital Holography." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607506/index.pdf.

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The multimedia watermarking techniques are evolved very quickly in the last years with the increase in the use of internet. The evolution of the internet makes the copyright issues very important and many different approaches are appeared to protect the digital content. On the other hand, holography is the method to store the 3-D information of an object but it is very applicable to use as a watermark because of the nature of the holographic data. The 3-D object can be reconstructed from the hologram even if the hologram is cropped or occluded. However, watermarking of an image with a hologram
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20

Pejchang, Darawan. "Measurement of nanoparticles by digital in-line holography." Rouen, 2015. http://www.theses.fr/2015ROUES052.

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Dans cette thèse, nous proposons une nouvelle méthode pour mesurer la taille et la forme de nanoparticules en utilisant l'holographie numérique dans l’axe en association un processus photo-thermique d’échauffement induit par laser. Une suspension de nanoparticules en très faible concentration et en milieu dilué dans une goutte d’eau, est chauffée par un laser impulsionnel. Une bulle de vapeur d’eau, stable, entourant la nanoparticule secondaire à l’échauffement est créée. La transposition de taille de l’échelle nanométrique à l’échelle micrométrique est alors obtenue. Ce processus photo-thermi
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21

El, Rhammad Anas. "Efficient compression for scalable transmission of digital holograms." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAT002.

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Contrairement à la stéréoscopie, l'holographie permet une visualisation 3D la plus naturelle et confortable possible. En revanche, les hologrammes numériques contiennent une grande quantité de données avec peu de corrélations. Dans la première partie de ce travail, nous avons introduit deux méthodes de compression des hologrammes numériques. Tout d'abord, nous avons décomposé l'hologramme en faisceaux lumineux en utilisant les ondelettes de Gabor. Pour des fins de compression, nous avons compacté l'expansion obtenue en utilisant l'algorithme du guillemotleft Matching Pursuitguillemotright. Ens
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22

Akin, Enver Turan. "Investigations of Horizontal-Parallax-Only Optical Scanning Holography (HPO-OSH) through MATLAB Simulations." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/32430.

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The concept of generating horizontal-parallax-only (HPO) holograms by computer simulations is investigated. The 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 are then discussed. In order to illustrate the ideas, holograms were created and reconstructed using MATLAB simulations. The holograms are simulated by convolving the Fresnel zone p
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23

Fernández, Meylí Valin. "Desenvolvimento da microscopia holográfica digital por reflexão para avaliação 3D de superfícies." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-04012018-105154/.

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Dentre dos procedimentos geradores de perfil óptico encontra-se a microscopia holográfica digital. Esta ferramenta interferométrica surgiu da ideia inicial proposta por D. Gabor sobre holografia, a qual permite mediante o registro da interferência de campos ópticos coerentes, guardar e extrair informações de imagens. A microscopia holográfica digital permite a análise de objetos com resoluções transversais semelhantes às obtidas por microscopia óptica, e ainda, possui a vantagem pela natureza da holografia de permitir realizar análises através do acesso a valores quantitativos de fase. Apresen
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24

El, Mallahi Ahmed. "Automated 3D object analysis by digital holographic microscopy." Doctoral thesis, Universite Libre de Bruxelles, 2013. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209489.

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The main objective of this thesis is the development of new processing techniques for digital holograms. The present work is part of the HoloFlow project that intends to integrate the DHM technology for the monitoring of water quality. Different tools for an automated analysis of digital holograms have been developed to detect, refocus and classify particles in continuous fluid flows. A detailed study of the refocusing criterion permits to determine its dependencies and to quantify its robustness. An automated detection procedure has been developed to determine automatically the 3D positions o
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25

Czarske, Jürgen W., Daniel Haufe, Nektarios Koukourakis, and Lars Büttner. "Perspectives of multimode fibers and digital holography for optogenetics." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A34836.

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Optogenetic approaches allow the activation or inhibition of genetically prescribed populations of neurons by light. In principle, optogenetics offers not only the ability to elucidate the functions of neural circuitry, but also new approaches to a treatment of neurodegenerative diseases and recovery of vision and auditory perception. Optogenetics already has revolutionized research in neuroscience. However, new methods for delivering light to three-dimensionally distributed structures e.g. in the brain are necessary. A major hurdle for focusing light through biological tissue is the occurring
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26

Abeywickrema, Haburugala Vithanage Ujitha A. "Applications of Induced Gratings in Nonlinear Media." University of Dayton / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1429985534.

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27

Khmaladze, Alexander. "Three-dimensional microscopy by laser scanning and multi-wavelength digital holography." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002638.

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28

Kaczorowski, Andrzej. "Adaptive aberration correction for holographic projectors." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/270322.

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This work builds up on the greatest minds of Cambridge Holography: Adrian Cable, Edward Buckley, Jonathan Freeman, and Christoph Bay. Cable and Buckley, developed an OSPR algorithm which was the first to provide high-quality real-time hologram generation using general-purpose hardware while Freeman designed a method to correct arbitrary aberrations. As ingenious as the method was, the calculations were extensively lengthy. Addressing this issue, a variant of OSPR suited for correcting spatially-varying aberration is presented. The algorithm combines the approaches of Cable, Buckley and Freeman
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29

Khodadad, Davood. "Combined Digital Holography and Speckle Correlation for Rapid Shape Evaluation." Licentiate thesis, Luleå University of Technology, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-55813.

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In manufacturing industry there is a high demand for on line quality control to minimize the risk of incorrectly produced objects. Conventional contact measurement methods are usually slow and invasive, meaning that they cannot be used for soft materials and for complex shapes without influencing thecontrolled parts. In contrast, interferometry and digital holography in combination with computers become faster, more reliable and highly accurate as an alternative non-contact technique for industrial shape evaluation. In digital holography, access to the complex wave field and the possibility to
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30

Potcoava, Mariana Camelia. "Digital holography applications in ophthalmology, biometry, and optical trapping characterization." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0003037.

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31

Liu, Haipeng. "Evaluation of Digital Holographic Reconstruction Techniques for Use in One-shot Multi-angle Holographic Tomography." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406912572.

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32

Fung, Jerome. "Measuring the 3D Dynamics of Multiple Colloidal Particles with Digital Holographic Microscopy." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11200.

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We discuss digital holographic microscopy (DHM), a 3D imaging technique capable of measuring the positions of micron-sized colloidal particles with nanometer precision and sub-millisecond temporal resolution. We use exact electromagnetic scattering solutions to model holograms of multiple colloidal spheres. While the Lorenz-Mie solution for scattering by isolated spheres has previously been used to model digital holograms, we apply for the first time an exact multisphere superposition scattering model that is capable of modeling holograms from spheres that are sufficiently close together to ex
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33

Wichitwong, Wisuttida. "Application of digital holography for metrology of inclusions in a droplet." Thesis, Rouen, INSA, 2015. http://www.theses.fr/2015ISAM0007/document.

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Dans cette thèse, l'holographie numérique dans l'axe (DIH) est la principale méthode optique utilisée pour analyser des inclusions dans une gouttelette. L'holographie numérique dans l'axe est utilisée pour caractériser des inclusions du point de vue de leur taille, leur position 3D et leur trajectoire à l'intérieur de la gouttelette. Comme les particules sont situées à l'intérieur d'une gouttelette, le front d'onde incident sur l'inclusion est modifié avant qu'il l'illumine. Le défi de ce travail est double : premièrement de prendre en compte la forme de la gouttelette dans le modèle d'hologra
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34

Rivet, Julie. "Non-iterative methods for image improvement in digital holography of the retina." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS246.

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Avec l’augmentation du nombre de personnes souffrant de déficience visuelle modérée à sévère, la surveillance et le traitement des troubles de la vision sont devenus des enjeux majeurs de la médecine actuelle. Au centre hospitalier national d’ophtalmologie des Quinze-Vingts à Paris, deux bancs optiques ont été installés ces dernières années pour développer deux techniques d'holographie numérique en temps-réel pour l’imagerie de la rétine : la tomographie holographique par cohérence optique (OCT holographique) plein champ et l'holographie laser Doppler. La première reconstitue des images en tro
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35

Thiesing, Benjamin P. "High temperature measurements of surface changes in metal alloys using digital holography." Thesis, Northern Arizona University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1537812.

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<p> Digital Holography (DH) is an emerging tool for use in the structural investigation of temperature dependent material processes. DH is able to reveal deformations and topological details at ultrahigh sensitivity (a few tens of nanometers) for particular details such as point-like objects and interfacial structures, allowing for the investigation of a range of processes. However, while DH is able to provide high precision data, the height measurement range is limited by the probe wavelength. Therefore a 'synthetic' wavelength created from the superposition of two or more individual waveleng
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36

Dobrev, Ivo Tsvetanov. "Full-field vibrometry by high-speed digital holography for middle-ear mechanics." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-dissertations/328.

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"Hearing loss affects approximately 1 in 10 people in the world and this percentage is increasing every year. Some of the most common causes of hearing loss are disorders of the middle-ear. Early detection and diagnosis of hearing loss as well as research to understand the hearing processes depend on medical and research tools for quantification of hearing capabilities and the function of the middle-ear in the complex acousto-mechanical transformation of environmental sounds into vibrations of the middle-ear, particular of the human tympanic membrane (TM or eardrum). Current ear exams assess
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37

Öhman, Johan. "3D localization in digital holography from scattered light from micrometer-sized particles." Licentiate thesis, Luleå tekniska universitet, Strömningslära och experimentell mekanik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68374.

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When a particle is illuminated by a beam of light it will scatter and redistribute the light in all directions. How it scatters depends on the size, shape and refractive index of the particle. Additionally, it depends on the wavelength and polarization of the illuminating beam. The direction and distance to the observer relative the particle also needs to be considered.  A digital holographic imaging system is used to collect parts of the scattered light from micrometer-sized particles. By utilizing digital holography a three-dimensional reconstruction of the imaged scene is possible. Traditio
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38

Flewellen, James Lewis. "Digital holographic microscopy for three-dimensional studies of bacteria." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:94ff344b-51ec-41c5-a5f8-c579e16dccd7.

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Holography has the ability to render three-dimensional information of a recorded scene by capturing both the amplitude and phase of light incident on the recording medium. The application of digital camera technology and high-speed computing means digital holograms can be analysed numerically and novel applications can be found for this technology. This thesis explores the potential for both inline and off-axis digital holographic microscopy to study the three-dimensional swimming behaviour of bacteria. A high-magnification (225x) digital holographic microscope was designed and constructed wit
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39

Burns, Nicholas. "Automated analysis system for the study of digital inline holograms of aquatic particles." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=166951.

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The work embodied in this thesis describes software techniques developed to analyse digital inline holograms of suspended particle fields, particularly in aquatic environ- ments. The primary motivation behind this work has been development of tech- niques to extract useable information from individual holograms within holovideos, producing focused silhouettes of recorded plankton and other particulates with min- imal user intervention. Two automated focusing algorithms are developed and presented in this work, both of which obtain comparable results for holograms of sparse plankton populations
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40

Naidoo, Thegaran. "Digital holographic microscopy with automated detection of red blood cells." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/61032.

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The digital in-line holographic configuration is motivated by the goal of developing a portable, cost effective sensor system for pre-screening patient blood samples. The theory of holography is explained from the foundational concepts in scalar diffraction theory all the way through to the implementation of reconstruction algorithms. Methods for the enhancement of holographic reconstructions are described. The algorithms that perform an automated count of the reconstructed objects are described and demonstrated. Simulated and experimental results are provided. Together, the lens-free holograp
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41

Hattay, Jamel. "Wavelet-based lifting structures and blind source separation : applications to digital in-line holography." Rouen, 2016. http://www.theses.fr/2016ROUES016.

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Ce projet de thèse expose des méthodes de traitement, dans le domaine des ondelettes, pour résoudre certains problèmes liés à la mise en oeuvre de l’holographie numérique dans l’axe. Ce developpement utilise des outils de la théorie de l’information et des divers moyens de traitement du signal tels que la séparation aveugle de sources (SAS). Cette technique est exploitée, ici, pour améliorer l’efficacité de l’holographie numérique, tels que la suppression de l’image jumelle, l’estimation de l’indice de réfraction, le codage et la transmission temps réel des hologrammes. Tout d’abord, nous donn
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42

Downham, Alexander David. "True 3D Digital Holographic Tomography for Virtual Reality Applications." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1513204001924421.

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43

Antier-Murgey, Marie. "Mesure interférométrique de phase et application à la combinaison cohérente d’un grand nombre de fibres amplificatrices." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112334/document.

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Les propriétés intrinsèques des fibres amplificatrices telles que leur robustesse, leur efficacité, leur qualité de faisceau ou encore leur compacité ou leur bonne gestion thermique, en font un candidat idéal pour le développement de sources lasers de haute puissance, capables de rivaliser aujourd’hui avec les lasers solides. Les applications de ces sources avec de fortes puissances sont nombreuses : l’industrie (usinage, marquage), la défense (télémétrie, imagerie), la physique des particules. Dans ce dernier cas, des sources ultra-brèves et ultra-intenses permettent d’envisager de nouvelles
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44

Brito, Isis Vasconcelos de. "Técnicas de microscopia holográfica digital aplicadas à análise de sistemas biológicos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-11012016-131143/.

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A Microscopia Holográfica Digital (MHD) é uma poderosa ferramenta para análise não destrutiva de superfícies e caracterização morfológica e estrutural de materiais. Várias técnicas microscópicas têm sido utilizadas com esses objetivos, mas, em todas elas, a visualização de campo completo não é permitida em uma única aquisição da informação do sistema analisado, além disso, a necessidade de uso de corantes, o processo de varredura, entre outros fatores, dificulta a aquisição das imagens. A Microscopia Holográfica Digital permite contornar essas dificuldades através de um método simples e rápido
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45

Welsh, Thomas V. "Quantitative Analysis of 3D Images Formed Using Range Compressed Holography." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1512317926568769.

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46

Philipp, Katrin, Florian Lemke, Matthias C. Wapler, Ulrike Wallrabe, Nektarios Koukourakis, and Jürgen W. Czarske. "Spherical aberration correction of adaptive lenses." SPIE, 2017. https://tud.qucosa.de/id/qucosa%3A34878.

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Deformable mirrors are the standard adaptive optical elements for aberration correction in confocal microscopy. Their usage leads to increased contrast and resolution. However, these improvements are achieved at the cost of bulky optical setups. Since spherical aberrations are the dominating aberrations in confocal microscopy, it is not required to employ all degrees of freedom commonly offered by deformable mirrors. In this contribution, we present an alternative approach for aberration correction in confocal microscopy based on a novel adaptive lens with two degrees of freedom. These lenses
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47

McReynolds, Naomi. "Advanced multimodal methods in biomedicine : Raman spectroscopy and digital holographic microscopy." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12129.

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Moving towards label-free technologies is essential for many clinical and research applications. Raman spectroscopy is a powerful tool in the field of biomedicine for label-free cell characterisation and disease diagnosis, owing to its high chemical specificity. However, Raman scattering is a relatively weak process and can require long acquisition times, thus hampering its integration to clinical technologies. Multimodal analysis is currently pushing the boundaries in biomedicine, obtaining more information than would be possible using a single mode and overcoming any limitations specific to
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48

Grosse, Doris [Verfasser], Martin [Gutachter] Hofmann, and Thomas [Gutachter] Mussenbrock. "Topographic measurements using digital holographic microscopy combined with photorefractive single-shot holography / Doris Grosse ; Gutachter: Martin Hofmann, Thomas Mussenbrock ; Fakultät für Elektrotechnik und Informationstechnik." Bochum : Ruhr-Universität Bochum, 2014. http://d-nb.info/1214440932/34.

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49

Monnom, Olivier. "Méthodes algorithmiques de traitement d'images en holographie digitale." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210840.

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Le présent travail traite de problèmes particuliers en traitement de signal soulevés par l'holographie digitale. Le premier chapitre présente l'holographie et l'holographie digitale. Le deuxième chapitre aborde le problème des artéfacts apparaissant sur le bord des hologrammes lorsque ceux-ci sont propagés numériquement. Le troisième chapitre propose une méthode automatique pour éliminer la phase de fond d'un hologramme. Le quatrième chapitre montre comment améliorer la visibilité des hologrammes en supprimant les objets diffractants. Le cinquième chapitre expose un logiciel d'aide à l'analyse
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50

Kirchmann, Carl Christian, Elin Lundin, and Jakob Andrén. "A Study of Digital In-Line Holographic Microscopy for Malaria Detection." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229840.

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The main purpose of the project was to create an initial lab set-up for a dig-ital in-line holographic microscope and a reconstruction algorithm. Different parameters including: light source, pin-hole size and distances pinhole-object and object-camera had to be optimized. The lab set-up is to be developed further by a master student at the University of Nairobi and then be used for malaria detection in blood samples. To acquire good enough resolution for malaria detection it has been found necessary to purchase a gray scale camera with smaller pixel size. Two dierent approaches, in this repor
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