Results 11 to 20 of about 223,933 (277)

Diffuse field full matrix capture for near surface ultrasonic imaging [PDF]

Ultrasonics, 2018
This article reports a technique for near-surface ultrasonic array imaging. Information equivalent to an undelayed full matrix of inter-element responses is produced through cross-correlation of a later time diffuse full matrix. This reconstructed full matrix lacks the nonlinear effects of early time saturation present in a directly acquired response ...
Potter, J. N., Wilcox, P. D., Croxford, A. J.   +2 more
openaire   +4 more sources

Generalized Reich-Moore R-matrix approximation

EPJ Web of Conferences, 2017
A conventional Reich-Moore approximation (RMA) of R-matrix is generalized into a manifestly unitary form by introducing a set of resonant capture channels treated explicitly in a generalized, reduced R-matrix.
Arbanas Goran, Sobes Vladimir, Holcomb Andrew, Ducru Pablo, Pigni Marco, Wiarda Dorothea   +5 more
doaj   +3 more sources

Laser induced ultrasonic phased array using full matrix capture data acquisition and total focusing method [PDF]

Optics Express, 2016
Laser ultrasonics is a technique where lasers are employed to generate and detect ultrasound. A data collection method (full matrix capture) and a post processing imaging algorithm, the total focusing method, both developed for ultrasonic arrays, are modified and used in order to enhance the capabilities of laser ultrasonics for nondestructive testing ...
Stratoudaki, Theodosia, Clark, Matt, Wilcox, Paul D.   +2 more
openaire   +7 more sources

Full matrix capture and the total focusing imaging algorithm using laser induced ultrasonic phased arrays [PDF]

AIP Conference Proceedings, 2017
Laser ultrasonics is a technique where lasers are used for the generation and detection of ultrasound instead of conventional piezoelectric transducers. The technique is broadband, non-contact, and couplant free, suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments.
Stratoudaki, Theodosia, Clark, Matt, Wilcox, Paul D.   +2 more
openaire   +6 more sources

Hybrid solvers for reactor modelling: matrix-based and matrix-free approaches on voxel-dominated meshes [PDF]

Frontiers in Nuclear Engineering
Simulating neutronics and thermal hydraulics within nuclear reactor cores is computationally intensive, not only because of the complexity of the governing equations but also because of the intricate geometries involved.
Liang Yang, Liang Yang, Jianhui Yang, Jakov Popov, Andrew G. Buchan   +4 more
doaj   +2 more sources

Adapting the full matrix capture and the Total Focusing Method to laser ultrasonics for remote non destructive testing [PDF]

2017 IEEE International Ultrasonics Symposium (IUS), 2017
Laser Induced Phased Arrays (LIPAs) use post processing to focus and steer the laser generated and detected ultrasonic beam, synthesizing a phased array. The technique is broadband, non-contact, and couplant free, making LIPAs suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments.
Stratoudaki, Theodosia, Clark, Matt, Wilcox, Paul D.   +2 more
openaire   +4 more sources

Improvements to ultrasonic imaging with post-processing of full matrix capture data

, 2022
Ce mémoire présente les comparaisons entre les différentes méthodes de reconstruction "Total Focusing Method" (TFM) et des différents algorithmes modifiés qui utilisent les données obtenues avec la "Full Matrix Capture" (FMC) dans le but d'améliorer certains points clés présents dans les méthodes d'imageries, tel que les problèmes de reconstructions en
Deschênes Labrie, Patrick
openaire   +2 more sources

Modeling and Imaging of Ultrasonic Array Inspection of Side Drilled Holes in Layered Anisotropic Media

Sensors, 2021
There has been an increase in the use of ultrasonic arrays for the detection of defects in composite structures used in the aerospace industry. The response of a defect embedded in such a medium is influenced by the inherent anisotropy of the bounding ...
Chirag Anand, Roger M. Groves, Rinze Benedictus   +2 more
doaj   +1 more source

Subsampling Approaches for Compressed Sensing with Ultrasound Arrays in Non-Destructive Testing

Sensors, 2020
Full Matrix Capture is a multi-channel data acquisition method which enables flexible, high resolution imaging using ultrasound arrays. However, the measurement time and data volume are increased considerably.
Eduardo Pérez, Jan Kirchhof, Fabian Krieg, Florian Römer   +3 more
doaj   +1 more source

Suppressing artifacts in the total focusing method using the directivity of laser ultrasound

Photoacoustics, 2023
Based on a synthesized laser ultrasonic array, full matrix capture can be used to acquire data, which can then be post-processed using the total focusing method.
Huabin He, Kaihua Sun, Chaoming Sun, Jianguo He, Enfu Liang, Qian Liu   +5 more
doaj   +1 more source