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Tesi sul tema "Speckle"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Andersson, Angelica. "Combined speckle interferometry and speckle correlation for non-destructive testing." Licentiate thesis, Luleå tekniska universitet, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17020.

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When a sample is studied during loading in a tensile test machine, the sample is often exposed to rigid body motions during loading at the same time as it deforms due to tension. Therefore, the small deformation field is hard, or impossible, to measure when it is overlaid by a large motion. The large rigid body motions can be measured with methods like speckle correlation (also called digital speckle photography, DSP), but the results might be of too poor accuracy to resolve the deformation field. Interferometric methods on the other hand might measure the deformation field but the rigid body

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2

Grantham, Stephen Gary. "Digital speckle radiography." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619648.

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3

Alaimo, M. D. "Heterodyne speckle velocimetry." Doctoral thesis, Università degli Studi di Milano, 2007. http://hdl.handle.net/2434/61272.

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4

Huang, Jen-Rong. "Optoelectronic speckle shearing interferometry." Thesis, Cranfield University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309680.

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5

Atcha, Hashim. "Optoelectronic speckle pattern interferometry." Thesis, Cranfield University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282405.

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6

Evanschitzky, Peter. "Simulationsgestützte Oberflächendiagnostik mittels Speckle-Interferometrie." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965479129.

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7

An, Wei. "Industrial applications of speckle techniques." Doctoral thesis, KTH, Production Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3342.

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8

Syratt, Richard William. "Angular correlations of speckle patterns." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261820.

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9

Rodrigues, Silvestre. "Efeito estocastico em Speckle dinamico." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257030.

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Abstract (sommario):

Orientadores: Inacia Maria Dal Fabbro, Roberto Alves Braga Junior<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola<br>Made available in DSpace on 2018-08-09T03:56:10Z (GMT). No. of bitstreams: 1 Rodrigues_Silvestre_D.pdf: 5874424 bytes, checksum: f82d98473ad716d4bbdd08a46b90d886 (MD5) Previous issue date: 2007<br>Resumo: Este trabalho tem por objetivo contribuir para o desenvolvimento de uma metodologia de análise de vitalidade de tecidos vivos, por meio de um modelo estocástico destinado a interpretar e quantificar Padrão associadas ao fenômeno conhe

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10

Conrad, III Dallis G. "Speckle Statistics of Articulating Objects." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1320673424.

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11

Gebhardt, Mark William Dewdney. "Speckle reduction in SAR imagery." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/18786.

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Synthetic Aperture Radar (SAR) is a popular tool for airborne and space-borne remote sensing. Inherent to SAR imagery is a type of multiplicative noise known as speckle. There are a number of different approaches which may be taken in order to reduce the amount of speckle noise in SAR imagery. One of the approaches is termed post image formation processing and this is the main concern of this thesis. Background theory relevant to the speckle reduction problem is presented. The physical processes which lead to the formation of speckle are investigated in order to understand the nature of speckl

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12

Riechert, Falko. "Speckle reduction in projection systems." Karlsruhe Univ.-Verl. Karlsruhe, 2009. http://d-nb.info/997279346/04.

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13

Mosayebi, Mahshad. "Digital Laser Speckle Image Correlation." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2131.

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This thesis examines the feasibility of combining Digital Image Correlation (DIC) with laser speckle based methods to form a new hybrid deformation measurement method called Digital Laser Speckle Image Correlation (DilSIC). Consequently, this method does not require any sample preparation and allows for the measurement of displacement of micro structures in addition to large displacements. In this technique, a coherent 30mW-632nm laser beam is expanded with 40X lens and then illuminated on the target surface to produce a fine, homogenous laser speckle pattern. Images were captured before and a

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14

Purde, Andreas. "Speckle-Interferometrie zur Formvermessung unstetiger Oberflächen." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980540798.

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15

Riemenschneider, Markus. "Echtzeitvermessung dreidimensionaler Objekte mittels Speckle-Interferometrie." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973065346.

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16

Cristea, Anca. "Ultrasound tissue characterization using speckle statistics." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10329.

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L'objectif de la caractérisation des tissus par ultrasons ou ‘Quantitative Ultrasound (QUS)’ est de différencier les tissus pathologiques en associant les paramètres d’un modèle aux caractéristiques physiques du tissu. L'usage exclusif des ultrasons pour obtenir un diagnostic peut garantir que le patient ne subira pas une procédure invasive (e.g. une biopsie), utilisant des rayonnements ionisants (e.g. la tomographie) ou même inconfortable et coûteuse (e.g. IRM). Les méthodes de QUS extraient des informations sur la microstructure du tissu à partir du contenu spectral ou temporel des signaux u

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17

Li, Yikang. "Comparative study of speckle reduction approaches." Thesis, The George Washington University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1537954.

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<p> The speckle reduction is an important problem in coherent imaging, such as synthetic aperture radar or ultrasound imagery. There are several well-known speckle filters for reducing speckle in coherent images. However, different speckle filters will have their own advantages and disadvantages. The performance of speckle filter depends strongly on the speckle and scene models that are used as the basis for filter development. In this thesis, we will compare four different approaches, Lee filter, Kuan filter, Frost filter and Improved Sigma filter for speckle reduction. This thesis will furth

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18

Balboa, I. "Low coherence fibre optic speckle interferometry." Thesis, Cranfield University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341038.

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19

Ugarte, La Torre Diego Renato. "Implementation of a speckle-based spectrometer." Master's thesis, Pontificia Universidad Católica del Perú, 2016. http://tesis.pucp.edu.pe/repositorio/handle/123456789/7088.

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Existen diversos métodos para medir la longitud de onda de la luz. Uno de estos métodos está basado en la relación que existe entre la longitud de onda y los patrones de moteado. La implementación de este método consiste en hacer ingresar luz con un ancho espectral peque˜no sobre un extremo de una fibra óptica multimodal, para generar patrones de moteado a la salida de la fibra óptica. Estos patrones de moteado se relacionan con las longitudes de onda que contiene la luz que ingresa a la fibra óptica. En el presente trabajo se propone una nueva implementación que consiste en usar una pantalla

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20

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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Abstract (sommario):

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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21

Jin, Song. "Bispectral reconstruction of speckle-degraded images /." Online version of thesis, 1992. http://hdl.handle.net/1850/11230.

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22

CREATH, KATHERINE. "DIGITAL SPECKLE-PATTERN INTERFEROMETRY (OPTICAL TESTING)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188115.

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A digital speckle-pattern interferometer was built utilizing a 100 x 100 element Reticon diode array interfaced to an HP-9836C desk-top computer. A single-mode optical fiber mounted in the center of the system's aperture stop creates a spherical-wave reference beam. Secondary interference fringes are calculated inside the computer by subtracting speckle patterns before and after a deformation, and squaring this difference. This technique has been shown superior to that of taking the absolute value of the difference. The traditional vibrational observation technique of low-pass filtering a sing

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23

Newberry, Shawn. "Laser Speckle Patterns with Digital Image Correlation." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/theses/2885.

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Digital Laser Speckle Image Correlation (DiLSIC) is a technique that utilizes a laser generated speckle pattern with Digital Image Correlation (DIC). This technology eliminates the need to apply an artifact speckle pattern to the surface of the material of interest, and produces a finer speckle pattern resulting in a more sensitive analysis. This investigation explores the parameters effecting laser speckle patterns for DIC and studies DiLSIC as a tool to measure surface strain and detect subsurface defects on pressure vessels. In this study a 632.8 nm 30 mW neon-helium laser generated the spe

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24

Welde, Kristine. "Investigation of methods for speckle contrast reduction." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10045.

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<p>Speckle arises when coherent light is reflected from a rough screen and observed by an intensity detector with a finite aperture. Because speckle causes serious image degradation when lasers are used as light sources in e.g. projectors, methods for reducing the speckle contrast need to be developed. Different speckle contrast reduction methods are investigated in this thesis, such as a rotating diffuser and a sinusoidal rotating grating. In addition, speckle simulations with the optical system design software ZEMAX has been explored. A setup consisting of a 4-f imaging system with a rotati

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25

Narges, Afsham. "Speckle tracking for 3D freehand ultrasound reconstruction." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50851.

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The idea of full six degree-of-freedom tracking of ultrasound images solely based on speckle information has been a long term research goal. It would eliminate the need for any additional tracking hardware and reduces cost and complexity of ultrasound imaging system, while providing the benefits of three-dimensional imaging. Despite its significant promise, speckle tracking has proven challenging due to several reasons including the dependency on a rare kind of speckle pattern in real tissue, underestimation in the presence of coherency or specular reflection, ultrasound beam profile spatial v

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26

Shih, YiChang. "Laser speckle photography for surface tampering detection." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/75686.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 59-61).<br>It is often desirable to detect whether a surface has been touched, even when the changes made to that surface are too subtle to see in a pair of before and after images. To address this challenge, we introduce a new imaging technique that combines computational photography and laser speckle imaging. Without requiring controlled laboratory conditions, our method is able to detect surface

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27

Binder, Bradley Thomas 1960. "Laser radar tomography--the effects of speckle." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/34312.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.<br>Vita.<br>Includes bibliographical references (leaves 165-169).<br>by Bradley Thomas Binder.<br>Ph.D.

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28

Shilpiekandula, Vijay 1979. "A laser speckle based position sensing technique." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/27131.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (p. 129-131).<br>This thesis presents the design and development of a novel laser-speckle-based position sensing technique. In our prototype implementation, a He-Ne laser beam is directed at the surface of an air-bearing spindle. An imaging system is set up to capture speckle patterns scattered from the spindle surface. These patterns are highly correlated over small angular displacements of the spindle. We use correlation-based image-processing algorithms to meas

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29

Torres-Munoz, Keshia Nicole. "Regulation of Mitosis by Nuclear Speckle Proteins." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1341028309.

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30

Scheffold, Frank. "Speckle-Korrelationen und universelle Leitwertfluktuationen von Licht /." Konstanz : Hartung-Gorre, 1998. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB7215611.

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31

Porter, Matthew Stanton. "Soft x-ray speckle from rough surfaces /." view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/fullcit?p9957568.

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Thesis (Ph. D.)--University of Oregon, 2000.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 100-104). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9957568.

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32

Lin, Haibo Yu Ping. "Speckle mechanism in holographic optical coherence imaging." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6184.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 15, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Ping Yu. Vita. Includes bibliographical references.

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33

Mesquita, da Costa Kassiana. "Filtragem interagente de imagens com ruído speckle." Universidade Federal de Pernambuco, 2004. https://repositorio.ufpe.br/handle/123456789/2593.

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Made available in DSpace on 2014-06-12T15:59:32Z (GMT). No. of bitstreams: 2 arquivo5160_1.pdf: 4852221 bytes, checksum: 00af0b636289f3973abc1f5ce9bce923 (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2004<br>O ru´ıdo speckle aparece em imagens com iluminac¸ ao coerente, tais como, sonar, laser, ultra-sonografia e radar de abertura sint´etica (Synthentic Aperture Radar SAR). Existem diversas t´ecnicas para reduc¸ ao de ru´ıdo speckle. Este trabalho propoem uma metodologia que permite a utilizac¸ ao destas t´ecnicas a fi

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34

Saif, Babak Nasser. "Simultaneous phase shifted digital speckle pattern interferometry." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280499.

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The James Webb Space Telescope (JWST) is an anastigmatic, segmented cryogenic telescope. The stability of the primary mirror back-plane is a major concern in co-phasing the telescope and in the longer term stability of its image quality. The back-plane is a 6.6 meter structure constructed of carbon fiber, and is therefore a "diffuse" object, an object with surface roughness larger than the wavelength of the light. For this reason classical interferometeric measurements will not work. The objective is to design and characterize a Simultaneous phase shifted Digital Speckle Pattern Interferometer

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35

Pascucci, Marco. "Super-resolution microscopy by saturated speckle illumination." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCB100.

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36

LIETZAU, KAI-HENNING. "Electronic speckle pattern interferometry for cancer research." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2015. http://hdl.handle.net/2108/202465.

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The determination of mechanical properties is a topic of on-going research and has over the years provided new insights regarding complex biochemical processes such as the cell cycle, the progression of diseases and even influenced new forms of therapeutically treatment. However, this field of biomechanical research strongly depends on the analysis of biological samples and their mechanical behavior under stress. In order to achieve reliable results, a high resolution measurement technology and a gentle stimulation method are needed to examine the samples as close as possible to their or

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37

Johansson, Louise. "Analysis of cartilage surfaces using laser speckle imaging." Thesis, Linköping University, Department of Biomedical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5830.

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<p>An arthroscope is a diagnostic instrument for visualisation of the interior of a joint. By adding a laser to an arthroscope and feeding the images to a computer, one gets an method to measure the structure of the cartilage covering the joint. This gives an added diagnostic value. The laser will create laser speckles and this report covers the basic theories behind this. The anatomy of the joints, the properties of cartilage and the background on the disease arthritis are also covered, as well as the field of surface topography and image processing.</p><p>Experiments were performed on three

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38

Catheline, Stefan. "INTERFEROMETRIE-SPECKLE ULTRASONORE : APPLICATION A LA MESURE D'ELASTICITE." Phd thesis, Université Paris-Diderot - Paris VII, 1998. http://tel.archives-ouvertes.fr/tel-00378129.

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L'objectif de ce travail est de réaliser un outil de mesure de l'élasticité des milieux biologiques. L'idée est d'employer les ultrasons pour détecter des ondes de cisaillement générées par un « coup » acoustique de basse fréquence (10-500 Hz) au moyen d'un piston. Cette onde contient des informations sur la nature viscoélastique du solide dans lequel elle se propage. Si les ultrasons dans les milieux biologiques sont bien maîtrisés, ce n'est pas le cas des ondes de cisaillements. Par conséquent la réalisation de cet outil nécessite une meilleure compréhension des ondes de basse fréquence. Dan

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39

Cheng, Yan Don. "Underwater acoustic imaging image reconstruction using speckle interferometry." Ohio : Ohio University, 1994. http://www.ohiolink.edu/etd/view.cgi?ohiou1176841747.

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40

Mo, Ning. "Mechanical characterisation of bone with laser speckle photography." Thesis, Queen Mary, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339170.

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41

Martin, Peter. "Uncertainty due to speckle noise in laser vibrometry." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7139.

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This thesis presents fundamental research in the field of laser vibrometry for the application to vibration measurements. A key concern for laser vibrometry is the effect of laser speckle which appears when a coherent laser beam scatters from an optically rough surface. The laser vibrometer is sensitive to changes in laser speckle which result from surface motions not in the direction of the incident beam. This adds speckle noise to the vibrometer output which can be indistinguishable from the genuine surface vibrations. This has been termed ‘pseudo-vibration' and requires careful data interpr

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42

Riemenschneider, Markus [Verfasser]. "Echtzeitvermessung dreidimensionaler Objekte mittels Speckle-Interferometrie / Markus Riemenschneider." Aachen : Shaker, 2006. http://d-nb.info/1186582251/34.

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43

Bertthelon, Xavier. "Speckle imaging and image processingapplied to life sciences." Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-161746.

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44

Rothberg, Steven Joseph. "Laser speckle studies for vibration and torque measurement." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241481.

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45

Standley, C. "Hardwired data processing applied to stellar Speckle interferometry." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46649.

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46

Borbely, Luiz Alberto. "Medida de rugosidade por correlação angular de speckle." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-14052014-160405/.

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Esse trabalho apresenta o método de correlação angular de speckle. Esse método foi melhorado para ser aplicado na medição de rugosidade na faixa de 30 m a 0,1 m. Um programa de computador foi desenvolvido para processar imagens e calcular a correlação angular, e novas fórmulas matemáticas foram deduzidas.<br>This work presents the speckle pattem angular correlation method. This method was improving to be applicable in the roughness measuring in the range of 0,1 m to 30 m. A software was developed to process image and to calculate the angular correlation, and new mathemat

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47

Wan, Abdullah Wan Saffiey. "Analysis of error functions in speckle shearing interferometry." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/33652.

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Electronic Speckle Pattern Shearing Interferometry (ESPSI) or shearography has successfully been used in NDT for slope (δw/δx and/or δw/δy) measurement while strain measurement (δu/δx, δv/δy, δu/δy and δv/δx) is still under investigation This method is well accepted in industrial applications especially in the aerospace industry. Demand of this method is increasing due to complexity of the test materials and objects. ESPSI has successfully performed in NOT only for qualitative measurement whilst quantitative measurement is the current aim of many manufacturers. Industrial use of such equipment

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48

Catheline, Stefan. "Interférométrie Speckle ultrasonore : application à la mesure d'élasticité." Paris 7, 1998. http://www.theses.fr/1998PA077193.

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49

Galushko, K. S. "Characteristics of «polychromatic speckle fields» and temporal coherence." Thesis, БДМУ, 2021. http://dspace.bsmu.edu.ua:8080/xmlui/handle/123456789/18845.

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50

Song, Lipei. "Endoscopic laser speckle contrast analysis for tissue perfusion." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/10923.

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Abstract (sommario):

Laser speckle contrast analysis (LASCA), as a method of measuring blood flow speed and tissue perfusion, is a full field imaging technique requiring simple configurations and data processing, which is important for the application in real time in vivo. But LASCA is sensitive to changes in environmental factors. The application in vivo is also limited to superficial detection due to the limitation of the light penetration depth. Therefore this thesis aims to develop an endoscopic LASCA system to extend the access to internal detection and explore the relationship between the contrast and experi

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