Academic literature on the topic 'Diffraction'

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Journal articles on the topic "Diffraction"

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Kanasewich, Ernest R., and Suhas M. Phadke. "Imaging discontinuities on seismic sections." GEOPHYSICS 53, no. 3 (1988): 334–45. http://dx.doi.org/10.1190/1.1442467.

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In routine seismic processing, normal moveout (NMO) corrections are performed to enhance the reflected signals on common‐depth‐point or common‐midpoint stacked sections. However, when faults are present, reflection interference from the two blocks and the diffractions from their edges hinder fault location determination. Destruction of diffraction patterns by poststack migration further inhibits proper imaging of diffracting centers. This paper presents a new technique which helps in the interpretation of diffracting edges by concentrating the signal amplitudes from discontinuous diffracting p
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Khaidukov, V., E. Landa, and T. J. Moser. "Diffraction imaging by focusing‐defocusing: An outlook on seismic superresolution." GEOPHYSICS 69, no. 6 (2004): 1478–90. http://dx.doi.org/10.1190/1.1836821.

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Diffractions always need more advertising. It is true that conventional seismic processing and migration are usually successful in using specular reflections to estimate subsurface velocities and reconstruct the geometry and strength of continuous and pronounced reflectors. However, correct identification of geological discontinuities, such as faults, pinch‐outs, and small‐size scattering objects, is one of the main objectives of seismic interpretation. The seismic response from these structural elements is encoded in diffractions, and diffractions are essentially lost during the conventional
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Grasmueck, Mark, Tijmen Jan Moser, Michael A. Pelissier, Jan Pajchel, and Kenri Pomar. "Diffraction signatures of fracture intersections." Interpretation 3, no. 1 (2015): SF55—SF68. http://dx.doi.org/10.1190/int-2014-0086.1.

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Fractured rock causes diffractions, which are often discarded as noise in ground-penetrating radar (GPR) and seismic data. Most fractures are too thin, too steep, and their displacement is too small to be imaged by reflections, and diffractions are the only detectable signal. To decipher the information about fracture geometry and distribution contained in diffractions, we compare 3D synthetic ray-Born modeling with high-density 3D GPR data and outcrop observations from the Cassis Quarry in Southern France. Our results reveal how the intersection between two fractures is the basic geologic ele
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Xingchen Pan, Xingchen Pan, Suhas P. Veetil Suhas P. Veetil, Cheng Liu Cheng Liu, Qiang Lin Qiang Lin, and Jianqiang Zhu Jianqiang Zhu. "High-contrast imaging for weakly diffracting specimens in coherent diffraction imaging." Chinese Optics Letters 11, no. 2 (2013): 021103–21105. http://dx.doi.org/10.3788/col201311.021103.

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Ruoqiu Wang, Ruoqiu Wang, Zhiyu Zhang Zhiyu Zhang, Chengli Guo Chengli Guo, Donglin Xue Donglin Xue, and and Xuejun Zhang and Xuejun Zhang. "Effects of fabrication errors on diffraction efficiency for a diffractive membrane." Chinese Optics Letters 14, no. 12 (2016): 120501–6. http://dx.doi.org/10.3788/col201614.120501.

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Barad, Karen. "Diffracting Diffraction: Cutting Together-Apart." Parallax 20, no. 3 (2014): 168–87. http://dx.doi.org/10.1080/13534645.2014.927623.

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Dell, Sergius, Anna Pronevich, Boris Kashtan, and Dirk Gajewski. "Diffraction traveltime approximation for general anisotropic media." GEOPHYSICS 78, no. 5 (2013): WC15—WC23. http://dx.doi.org/10.1190/geo2012-0346.1.

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Diffractions play an important role in seismic processing because they can be used for high-resolution imaging and the analysis of subsurface properties like the velocity distribution. Until now, however, only isotropic media have been considered in diffraction imaging. We have developed a method wherein we derive an approximation for the diffraction response for a general 2D anisotropic medium. Our traveltime expression is formulated as a double-square-root equation that allows us to accurately and reliably describe diffraction traveltimes. The diffraction response depends on the ray velocity
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Kim, Sooyoon, Soon Jee Seol, Joongmoo Byun, and Seokmin Oh. "Extraction of diffractions from seismic data using convolutional U-net and transfer learning." GEOPHYSICS 87, no. 2 (2022): V117—V129. http://dx.doi.org/10.1190/geo2020-0847.1.

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Diffraction images can be used for modeling reservoir heterogeneities at or below the seismic wavelength scale. However, the extraction of diffractions is challenging because their amplitude is weaker than that of overlapping reflections. Recently, deep-learning (DL) approaches have been used as a powerful tool for diffraction extraction. Most DL approaches use a classification algorithm that classifies pixels in the seismic data as diffraction, reflection, noise, or diffraction with reflection and takes whole values for the classified diffraction pixels. Thus, these DL methods cannot extract
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Bakhtiari Rad, Parsa, and Craig J. Hickey. "Seismic diffraction separation in the near surface: Detection of high-contrast voids in unconsolidated soils." GEOPHYSICS 86, no. 3 (2021): WA13—WA23. http://dx.doi.org/10.1190/geo2020-0366.1.

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Seismic diffractions carry the signature of near-surface high-contrast anomalies and need to be extracted from the data to complement the reflection processing and other geophysical techniques. Because diffractions are often masked by reflections, surface waves, and noise, careful diffraction separation is required as a first step for diffraction imaging. A multiparameter time-imaging method is used to separate near-surface diffractions. The implemented scheme makes use of the wavefront attributes that are reliable fully data-derived processing parameters. To mitigate the effect of strong nois
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Zhang, Jianfeng, and Jiangjie Zhang. "Diffraction imaging using shot and opening-angle gathers: A prestack time migration approach." GEOPHYSICS 79, no. 2 (2014): S23—S33. http://dx.doi.org/10.1190/geo2013-0016.1.

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We have developed a migration scheme that can image weak diffractions in time. This significantly contributes to conventional interpretation in detecting small-scale faults and heterogeneities. The proposed scheme images diffractions using the shot and opening-angle gathers generated by prestack time migration (PSTM). Here, the shot and opening-angle gather represents a 2D migrated gather in terms of shot locations and opening angles between the incident- and scattered-rays. We muted the Fresnel zones related to reflections, corrected phases of diffractions, and enhanced diffractions in the mi
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Dissertations / Theses on the topic "Diffraction"

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Hamam, Habib. "De la diffraction a la synthese des elements diffractifs." Rennes 1, 1995. http://www.theses.fr/1995REN10109.

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Parmi les facteurs les plus remarquables qui ont suscite l'interet pour les elements optiques diffractifs, on enumere deux facteurs. La technologie actuelle a vecu recemment un progres important qui a touche notamment la mise en uvre d'elements optiques ayant des hautes resolutions et des structures complexes. En outre apres l'apparition du laser, l'holographie synthetique a connu un essor remarquable qui s'est traduit notamment par des techniques de synthese des hologrammes generes par ordinateur operant en regime paraxial. Nous avons choisi de nous situer dans la continuite de ces trois dern
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White, Thomas Ashley. "Structure solution using precession electron diffraction and diffraction tomography." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611748.

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DeSandre, Lewis Francis. "Extinction theorem analysis of diffraction anomalies in overcoated-gratings." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184853.

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A rigorous analysis based upon the extinction theorem is presented to study anomalous resonance effects from single- and multilayer-overcoated, low-efficiency diffraction gratings. Anomalously high diffraction efficiency at resonance results from the coupling of the incident beam into guided waves that can be propagated within the composite structure. Both the traditional characteristic matrix technique and a recursive or R-matrix propagation technique are presented. The R-matrix propagation algorithm was found to be stable numerically, and computational results agree favorably with both exper
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Persson, Roger. "Breaking the diffraction limit using conical diffraction in super resolution fluorescence microscopy : Breaking the diffraction limit using conical diffraction in super resolution fluorescence microscopy." Thesis, KTH, Tillämpad fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140725.

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Grant, Stephen D. "Conical diffraction photonics." Thesis, University of Dundee, 2016. https://discovery.dundee.ac.uk/en/studentTheses/c4c0c9b8-f54a-406b-b73f-a84bc07f456e.

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Recent interest in conical diffraction (CD) has led to a large increase in experimental and theoretical investigations over the last two decades, a marked change from the previous 160 quiet years in the field. Once dismissed as an optical curiosity, the phenomenon has emerged as a fascinating area with potential for a large number of practical applications many of which have been realised while others are still being discovered. In this thesis a number of aspects of the theory as recently described are experimentally investigated with a view to strengthening the current theoretical understandi
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Nishantha, Hewamarappulige Indunil. "Powder Diffraction Methods." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222116031.

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Ihee, Hyotcherl Zewail Ahmed H. Zewail Ahmed H. "Ultrafast electron diffraction /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-04072008-112244.

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Patton, Forest S. "Coherent atom beam diffraction /." view abstract or download file of text, 2005. http://wwwlib.umi.com/cr/uoregon/fullcit?p3190537.

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Thesis (Ph. D.)--University of Oregon, 2005.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 81-83). Also available for download via the World Wide Web; free to University of Oregon users.
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Edwards, Philip John. "Diffraction theory and radiometry." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408858.

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Walsh, Sheridan John T. P. "Diffraction by volume gratings." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303660.

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Books on the topic "Diffraction"

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Taylor, Charles Alfred. Diffraction. Hilger, 1987.

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Beeston, B. E. P. Electron diffraction and optical diffraction techniques. North-Holland, 1986.

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Roy, Markham, and Horne Robert W, eds. Electron diffraction and optical diffraction techniques. North-Holland Pub. Co., 1990.

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Dinnebier, R. E., and S. J. L. Billinge, eds. Powder Diffraction. Royal Society of Chemistry, 2008. http://dx.doi.org/10.1039/9781847558237.

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Cowley, J. M. Diffraction physics. 3rd ed. Elsevier Science B.V., 1995.

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Khidirov, Irisali. Neutron Diffraction. Intech, 2012.

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Izyumov, Yurii A., and Ruslan P. Ozerov. Magnetic Neutron Diffraction. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4684-0712-9.

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Schwartz, Lyle H., and Jerome B. Cohen. Diffraction from Materials. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-82927-7.

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Mittemeijer, Eric J., and Udo Welzel, eds. Modern Diffraction Methods. Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527649884.

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Suryanarayana, C., and M. Grant Norton. X-Ray Diffraction. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4899-0148-4.

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Book chapters on the topic "Diffraction"

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Stöhr, Joachim. "Classical Diffraction and Diffractive Imaging." In Springer Tracts in Modern Physics. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-20744-0_8.

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Michette, Alan G. "Diffractive Optics I Diffraction Gratings." In Optical Systems for Soft X Rays. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2223-8_6.

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Möser, Michael. "Diffraction." In Engineering Acoustics. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05391-1_10.

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Beynon, J. "Diffraction." In Work Out Waves and Optics. Macmillan Education UK, 1988. http://dx.doi.org/10.1007/978-1-349-10165-8_4.

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Gooch, Jan W. "Diffraction." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3650.

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Möller, Karl D., and Claude Bélorgoet. "Diffraction." In Cours d’optique. Springer Paris, 2007. http://dx.doi.org/10.1007/978-2-287-48620-3_3.

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Mickelson, Alan Rolf. "Diffraction." In Physical Optics. Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3530-0_7.

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Lüders, Klaus, and Robert Otto Pohl. "Diffraction." In Pohl's Introduction to Physics. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-50269-4_21.

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Rouan, Daniel. "Diffraction." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_431.

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Rouan, Daniel. "Diffraction." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_431.

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Conference papers on the topic "Diffraction"

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MAŁECKI, A. R., and M. PALLOTTA. "DIFFRACTION WITHOUT MULTIPLE DIFFRACTIVE DIPS." In Proceedings of the XXXII International Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704962_0039.

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Buralli, Dale A., and G. Michael Morris. "Performance of diffractive lenses with nonunity diffraction efficiency." In OSA Annual Meeting. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.tuj2.

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The unique optical properties of diffractive optical elements make them attractive candidates for a wide variety of applications. Unlike conventional optical elements, however, diffractive optics can simultaneously produce more than one image, resulting from the various diffracted orders. Rigorous electromagnetic grating diffraction theory shows that, in general, the diffraction efficiency can be a function of pupil position and field angle. If the diffractive lens is not 100% efficient in diffracting the incident light into the desired diffracted order, the resulting image can be degraded by
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Bräuer, Ralf, and Olof Bryngdahl. "Diffractive elements with large diffraction angles." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cmn3.

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Diffractive elements such as digital holograms1 and Dammann gratings2 can be used to generate an array of diffraction orders with specified intensity. The part of the diffraction pattern that contains these orders is called the signal window. The elements are designed using scalar diffraction theory; i.e., geometrical optics is used to predict the transmitted or reflected wave-front, and the wave propagation outside the element is calculated by paraxial approximations. For scalar diffraction theory to be valid the features of the element must be large compared to the wavelength. Correspondingl
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Moharam, M. G., and S. Dunn. "Grating diffraction analysis: Maxwell’s or Kirchhoff diffraction integrals." In Diffractive Optics and Micro-Optics. Optica Publishing Group, 1998. http://dx.doi.org/10.1364/domo.1998.dma.1.

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Scalar diffraction theory is widely used to design and analyze diffractive optical elements. This approach has been the approach of choice for it is easy to use, lacks computation strain, and more importantly, offer some direct approach for the design of diffractive elements. The validity and, therefore, the usability of the scalar diffraction approaches are based on the assumption that the smallest feature in the diffractive element is much greater than the wavelength of incident light. However, recent advances in the fabrication techniques have resulted in producing diffractive optical eleme
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BONATO, A. "DIFFRACTION AND DIFFRACTIVE FINAL STATES AT HERA." In Proceedings of the 22nd Lake Louise Winter Institute. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812776105_0012.

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Shan, Mao. "Tolerance analysis on diffraction efficiency and polychromatic integral diffraction efficiency for harmonic diffractive optics." In International Symposium on Optoelectronic Technology and Application 2016, edited by Sen Han and JiuBin Tan. SPIE, 2016. http://dx.doi.org/10.1117/12.2245583.

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Kazemeini, S. Hesam. "Diffraction amplitude analysis for detecting diffractor width." In SEG Technical Program Expanded Abstracts 2010. Society of Exploration Geophysicists, 2010. http://dx.doi.org/10.1190/1.3513113.

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Orava, Risto, Marcella Capua, Roberto Fiore, et al. "Diffractive Measurements at the LHC: Elastic and Inelastic Soft Diffraction." In DIFFRACTION 2010: INTERNATIONAL WORKSHOP ON DIFFRACTION IN HIGH ENERGY PHYSICS. AIP, 2011. http://dx.doi.org/10.1063/1.3601397.

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Moharam, M. G., and D. A. Pommet. "Diffraction of Gaussian beams by binary diffractive elements." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.mcc3.

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Multi-level binary diffrac­tive optical elements are of increasing importance in an expanding variety of engineering applications. Virtually all previous work on the analysis and design of binary diffractive elements has been for diffraction of infinite plane waves rather than the practical case of finite bounded-profile beams. Only diffraction of Gaussian beams by thick holographic gratings has been previously investigated. In this work the diffraction of finite beams by multi-level binary gratings is analyzed in detail by using the rigorous coupled-wave approach. The analysis applies to any
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"Preface: Diffraction 2014." In DIFFRACTION 2014: International Workshop on Diffraction in High-Energy Physics. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4915957.

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Reports on the topic "Diffraction"

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Choi, Junoh, Alvaro Cruz-Cabrera, and Anthony Tanbakuchi. Spectral diffraction efficiency characterization of broadband diffractive optical elements. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1095948.

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Erteza, I. A. Diffraction efficiency analysis for multi-level diffractive optical elements. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/164461.

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Copley, John R. D. Neutron powder diffraction. National Institute of Standards and Technology, 1998. http://dx.doi.org/10.6028/nist.ir.6204.

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Busing, W. (Diffraction and crystallography). Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/7024087.

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Lehman, S., and S. Norton. Radial Reflection Diffraction Tomography. Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/15009729.

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Schabel, Matthias C., Dilip G. Roy, and Altaf Khan. Transurethral Ultrasound Diffraction Tomography. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada446902.

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Schabel, Matthias C., Dilip G. Roy, and Altaf Khan. Transurethral Ultrasound Diffraction Tomography. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada453339.

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Kotula, Paul G. Advanced electron diffraction diagnostics. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1563075.

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Batcheller, Thomas Aquinas, Gary Michael Huestis, and Steven Michael Bolton. Remote Laser Diffraction PSD Analyzer. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/911470.

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Lehman, S. K., and S. J. Norton. Radial Reflection Diffraction Tomography Notes. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/15013570.

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