Three-dimensional and real-time two-dimensional topological imaging using parallel computing

Bachmann, Etienne; Jacob, Xavier; Rodríguez, Samuel; Gibiat, Vincent

doi:10.1121/1.4933696

Cited by 10 publications

(3 citation statements)

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“…[2]. This method is also related to those arising from topological derivative-based methods, as described in [26,4,14]. This also allows us to construct a method imaging the unknown scatterers in the medium.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Time reversal for obstacle location in elastodynamics from acoustic recording

Assous

Lin

2019

Comptes Rendus. Mécanique

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The aim of this paper is to study the feasibility of time-reversal methods in a non homogeneous elastic medium, from data recorded in an acoustic medium. We aim to determine, from partial aperture boundary measurements, the presence and some physical properties of elastic unknown "inclusions", i.e. not observable solid objects, located in the elastic medium. We first derive a variational formulation of the acousto-elastic problem, from which one constructs a time-dependent finite element method to solve the forward, and then, the time reversed problem. Several criteria, derived from the reverse time migration framework, are then proposed to construct images of the inclusions, and to determine their locations. The dependence/sensitivity of the approach to several parameters (aperture, number of sources, etc.) is also investigated. In particular, it is shown that one can differentiate between a benign and malignant close inclusions. This technique is fairly insensitive to noise in the data.

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Section: Numerical Resultsmentioning

confidence: 99%

“…together with TR initial conditions and TR absorbing boundary conditions on Γ f , analogous to (2) and (3) or (4). In that case, there is no external source f .…”

Section: Time Reversal For Acousto-elastodynamics Equationsmentioning

confidence: 99%

Time reversal for obstacle location in elastodynamics from acoustic recording

Assous

Lin

2019

Comptes Rendus. Mécanique

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“…There are many NDT methods that can detect the boundaries of defects inside the object by measuring reflected ultrasonic waves. One example is "topological imaging" [1,5]. Synthetic Aperture Focusing Technique (SAFT) [3,10] is also widely used.…”

Section: Introductionmentioning

confidence: 99%

Supercomputer Simulations of Nondestructive Tomographic Imaging with Rotating Transducers

Romanov

2018

JSFI

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A method of nondestructive ultrasound tomographic imaging employing a rotating transducer system is proposed. The rotating transducer system increases the number of emitters and detectors in a tomographic scheme by several times and makes it possible to neutralize image artifacts resulting from incomplete-data tomography. The inverse problem of tomographic reconstructing the velocity structure inside the inspected object is considered as a nonlinear coefficient inverse problem for a scalar wave equation. Scalable iterative algorithms for reconstructing the longitudinal wave velocity inside the object are discussed. The methods are based on the explicit representation for the gradient of the residual functional. The algorithms employ parallelizing the computations over emitter positions. Numerical simulations performed on the "Lomonosov-2" supercomputer showed that the tomographic methods developed can not only detect boundaries of defects, but also determine the wave velocity distribution inside the defects with high accuracy provided that both reflected and transmitted waves are registered.

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