Seismic diffraction tomography technique using very fast simulated annealing method for delineating small subsurface features

Mahapatra, Mahasweta; Mahapatra, Samiran

doi:10.1016/j.jappgeo.2008.10.004

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…However, one can consider any number of terms to arbitrarily increase the accuracy of DT in estimating the scatterer RI distribution. [ 29 ] A variety of other alternative approaches can also go beyond the Born and Rytov approximations, based on, for example, acquiring tomograms at multiple depths, [ 30 ] the method of very fast simulated annealing, [ 31 ] a combination of advanced forward and inverse problem solvers, [ 32 ] deep learning, [ 33 ] and other nonlinear inversion techniques. [ 34,35 ] In this way, it is possible to overcome the restrictions of the first‐order Born and Rytov approximations and precisely obtain the index profile of strong scatterers and multiple scattering objects via DT.…”

Section: Resultsmentioning

confidence: 99%

Imaging Cloaked Objects: Diffraction Tomography of Realistic Invisibility Devices

Díaz‐Fernández

Martí

García-Meca³

2022

Laser & Photonics Reviews

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Invisibility cloaks have become one of the most outstanding developments among the wide range of applications in the field of metamaterials. So far, most efforts in invisibility science have been devoted to achieving practically realizable cloak designs and to improving the effectiveness of these devices in reducing their scattering cross-section (SCS), a scalar quantity accounting for the total electromagnetic energy scattered by an object. However, little attention has been paid to the opposite side of the technology: the development of more efficient techniques for the detection of invisibility devices. For instance, the SCS ignores the phase change introduced by the cloak, as well as the angular dependence of the incident and scattered waves. Here, a different path is proposed, which takes advantage of the smarter way in which diffraction tomography processes all this overlooked information to improve the efficiency in unveiling the presence of invisibility devices. This approach not only results in a considerable sensitivity enhancement in the detection of different kinds of cloaks based on both scattering cancellation and transformation optics, but also enables us to obtain images depicting the approximate shape and size of the cloak. The proposed method can be extended to the detection of sound cloaks.

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Section: Resultsmentioning

confidence: 99%

Imaging Cloaked Objects: Diffraction Tomography of Realistic Invisibility Devices

Díaz‐Fernández

Martí

García-Meca³

2022

Laser & Photonics Reviews

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“…In the case where seismic re ectors are not evident such as in the zone of basement or salt/mud diapirs, seismic re ection travel time tomography might hit troubles. Therefore, a di erent approach must be considered, such as "common focus point (CFP) tomography" [7] or di raction-based tomography [8].…”

Section: Discussionmentioning

confidence: 99%

Some results of seismic travel-time reflection tomography study

Phạm¹,

Đoàn²,

Tạ³

et al. 2021

PVJ

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Velocity model is essential for seismic data processing as it plays an important role in migration processes as well as time depth conversion. There are several techniques to reach that goal, among which tomographic inversion is an efficient one. As an upgrade version of handpicked velocity analysis, the tomography technique is based on the reflection ray tracing and conjugate gradient method to estimate an optimum velocity model and can create an initial high quality model for other intensive imaging and modelling module such as reverse-time migration (RTM) and full-waveform inversion (FWI). For the mentioned benefit, we develop a seismic travel-time reflection tomography (SeisT) module to study the accuracy of the approach along with building the technical capability in seismic processing. The accuracy of the module has been tested by both synthetic and real seismic field data; the efficiency and the accuracy of the model have been proven in terms of development method as well as field data application.

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Probabilistic Inverse Theory

Dębski¹

2010

Advances in Geophysics

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Seismic diffraction tomography technique using very fast simulated annealing method for delineating small subsurface features

Cited by 3 publications

References 22 publications

Imaging Cloaked Objects: Diffraction Tomography of Realistic Invisibility Devices

Imaging Cloaked Objects: Diffraction Tomography of Realistic Invisibility Devices

Some results of seismic travel-time reflection tomography study

Probabilistic Inverse Theory

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