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 ATA, with frequency-domain signal subspace methodology like multiple signal classification. We illustrate the theory with numerical simulations for ultrasound. WitrynaBroadband time reversal communications. Application: imaging in random media . Imaging of phase objects. Long-exposure imaging. Short-exposure imaging. …
Imaging and time reversal in random media
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http://users.tem.uoc.gr/~tsogka/papers/BPTB02.pdf WitrynaBecause of the time reversibilityof the wave equation we have (difiraction limited) refocusing of the time reversed signal at the source, in any non attenuating medium. …
Witryna17 sty 2002 · The phenomenon of super-resolution in time-reversal acoustics is analyzed theoretically and with numerical simulations. A signal that is recorded and then retransmitted by an array of transducers, propagates back though the medium, and refocuses approximately on the source that emitted it. In a homogeneous medium, the … Witryna30 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 …
WitrynaWe 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 … Witryna5 lut 2002 · OSTI.GOV. Conference: Statistical Stability and Time-Reversal Imgaing in Random MediaStatistical Stability and Time-Reversal Imgaing in Random Media
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 …
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 … how do they do a stress testWitryna22 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 … how much should you pay an executorWitrynaPublisher's summary. Wave propagation in random media is an interdisciplinary field that has emerged from the need in physics and engineering to model and analyze wave energy transport in complex environments. This book gives a systematic and self-contained presentation of wave propagation in randomly layered media using the … how much should you pay an editorWitrynay the resolution of time reversal and imaging. Since they occur in random media, the resolution theory is augmented with the important concept of statistical stability. It refers to robustness of the processes with respect to di erent realizations of the random medium. Description. Time reversal is a physical experiment that uses special arrays ... how do they do a tonsillectomyWitrynaIn this paper we report on an experiment in which we show that the focusing property of time reversal holds when the scattering medium in the time-reversed phase … how much should you pay for broadbandhow much should you pay a pet sitter per dayWitrynaThis 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 … how do they do a vq scan