Imaging and time reversal in random media
WitrynaThis is a new approach to array imaging that is motivated by time reversal in random media, analysed in detail previously. It combines features from seismic imaging, like … http://www-personal.umich.edu/%7Eborcea/Publications/ip2503.pdf
Imaging and time reversal in random media
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Witryna27 wrz 2002 · J. F. Clouetand J.-P. Fouque, “ A time reversal method for an acoustical pulse propagating in randomly layered media,” Wave Motion 25, 361– 368 (1997). Google Scholar Crossref; 33. K. Solnaand G. Papanicolaou, “ Ray theory for a locally layered random medium,” Waves Random Media 10, 151– 198 (2000). Google … WitrynaImaging and time reversal in random media 1249 1.3. Imagingstrategies Any reflection-based imaging method involves some form of back-propagation into the medium, or time reversal,ofthe fields measured on the array. This is because the back-propagated fields tend to focus on sharp reflectors in the medium. Inphysical time …
WitrynaThis is a new approach to array imaging that is motivated by time reversal in random media, analysed in detail previously. It combines features from seismic imaging, like ATA, with frequency-domain signal subspace methodology like multiple signal classification. We illustrate the theory with numerical simulations for ultrasound. WitrynaFigure 2: The matched field estimator in deterministic media (left figure, equation (4.3)) and in random media (right figure, equation (4.6)), for an effective aperture ae = 2a. - "A resolution study for imaging and time reversal in random media"
Witryna22 lut 2003 · This is a new approach to array imaging that is motivated by time reversal in random media, analyzed in detail previously. It combines features from seismic … http://users.tem.uoc.gr/~tsogka/papers/BPTB02.pdf
Witryna1 lis 2007 · 1. Introduction [2] Time reversal has attracted considerable attention in recent years, particularly because of its potential for communication and imaging through a complex environment. When a wave is emitted by a point source and is received by an array of receivers, and time-reversed and back-propagated in the same medium, the …
WitrynaSince statistical stability is not characteristic of the frequency domain, a transform back to the time domain after first diagonalizing the array data in the frequency domain takes optimum advantage of both the time-domain stability and the frequency-domain orthogonality of the relevant eigenfunctions. Download conference paper PDF. dating app whatsapp scambjs.com wholesale locationsWitryna1 mar 2024 · They show that, contrary to long-held beliefs, multiple scattering in random media and multi-pathing in waveguides and cavities enhances spatial resolution in … dating a pro boxerWitryna30 cze 2007 · The enhanced spatial focusing and time compression of signals in time reversal in random media have many diverse applications in detection and in focused energy delivery on small targets as, for example, in the - struction of kidney stones. Enhanced spatial focusing is also useful in sonar and wireless communications for … bjs.com wholesale seabrook nhWitrynaThis paper presents several imaging techniques for objects in the presence of random media. Time-reversal MUSIC (multiple signal classification) imaging has excellent resolution when multiple scattering is small or moderate. Modified beamformer imaging has moderately high resolution even at large multiple scattering. dating app wrong number scamWitrynaWe give a self-contained presentation of coherent array imaging in random media, which are mathematical models of media with uncertain small-scale features (inhomogeneities). ... But the two are not the same at all in cluttered media. Time reversal works better in clutter [6, 19, 27] because scattering by the inhomogeneities … bjs cooler bagWitryna1 lis 2001 · Request PDF Imaging and time reversal in random media Time reversal in random media can result in refocusing on the source with a resolution that is better … bjs.com wholesale webster ny