Calculation of Wideband Ultrasonic Fields Radiated by Water-Coupled Transducers into Anisotropic Media

Gengembre, Nicolas; Calmon, Pierre

doi:10.1007/978-1-4615-5339-7_116

Cited by 7 publications

(6 citation statements)

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“…Arbitrary transducer surface may be considered as well, including multiple-element transducers. The piece material may be isotropic or anisotropic (the extension to this latter case is presented in details in this review [6]). Predictions successfully compare with experimental measurements for isotropic materials [3].…”

Section: Champ-sons Model Of Ultrasonic Field Predictionmentioning

confidence: 99%

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New Developments in Ultrasonic NDT Modeling in CIVA

Calmon

Raillon

Paradis

1998

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Champ-sons Model Of Ultrasonic Field Predictionmentioning

confidence: 99%

“…The model Champ-Sons has been extended to the case of anisotropic solids [6]. Various tools have been developed for helping transducer design based upon the full capabilities of the Champ-Sons model or using routines of the model for specific developments.…”

Section: Introductionmentioning

confidence: 99%

New Developments in Ultrasonic NDT Modeling in CIVA

Calmon

Raillon

Paradis

1998

Review of Progress in Quantitative Nondestructive Evaluation

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“…developed by Gengembre and Lhemery. allows to model any geometry and material (including anisotropic [10] and heterogeneous) specimen.…”

Section: Application To Various Interface Geometrymentioning

confidence: 99%

Application of Ultrasonic Beam Modeling to Phased Array Testing of Complex Geometry Components

Roy

Mahaut

Serre

1999

Review of Progress in Quantitative Nondestructive Evaluation

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INTRODUCflONFor several years, the French Atomic Energy Commission (CEA) has developed phased array techniques to improve defect characterization and adaptability to various inspection configurations [1]. Such techniques allow to steer and focus the ultrasonic beam radiated by a transducer split into a set of individually addressed elements, using amplitude and delay laws. For most conventional systems, those delay laws are extracted from geometric ultrasonic paths between each element of the array and a geometric focusing point, or experimentally deduced for a detected defect. Geometric delay laws are usually applied to perform beam-forming abilities [2] for simple geometry components (e.g. beamsteering over a plane specimen), whereas experimental delays can be supplied to the array at transmission and reception to optimally adapt the ultrasonic beam to the detected defect, in a so-called self-focusing process [3,4]. This method, relevant for complex material or geometry leading to phase distortion or complex paths that cannot be predicted by simple geometrical calculations, obviously requires the existence of a reflector and the ultrasonic beam radiated by the experimental delay law cannot be known. Therefore this technique is used to improve defect detection (optimal sensibility) rather than defect characterization. To assess complex geometry components inspection with an adaptive system, the CEA has developed new modeling devoted to predict the ultrasonic field radiated by arbitrary transducers through complex geometry and material specimen [5]. A model allows to compute optimized delay laws to preserve the characteristics of the beam through the complex surface, as well as the actual radiated field using those delays. This paper presents two applications of this model: the inspection of a misaligned specimen, and the inspection of an irregular surface. A COMPUTATION MODEL FOR NDT CONFIGURATIONS: CHAMP-SONSThe Champ-Sons model has been developed for several years [6], and validated using comparisons with other models -angular spectrum and finite elements method [7] -, and experiments [8]. This model, based on the Rayleigh integral extended to take account of refraction through a Fluid/Solid interface, gives accurate and quantitative results assuming that both field computation and source points are not close to the interface (about

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“…GENGEM-BRE et A/. [15] extended the model to anisotropic media with planar interfaces. To handle caustics a third order expansion of the phase has been employed.…”

Section: Historical Perspectivementioning

confidence: 99%

“…15 Comparison of the on-axis-scans: Collection of the 45° refracted shear wave on axis plot; Casel : Q = 0°; Case2 : Q = 45°; CaseS: a = 90° Definition of the angles 0, $ used in angular plane wave integrals.…”

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confidence: 99%

Ultrasonic beam models in anisotropic media

Rudolph

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This is to certify that the Doctoral dissertation of Matthias Rudolph has met the dissertation requirements of Iowa State University Commi e Ni^ber Committee Member Committee Memb r Committee Member Co mittee M ber For the M jo P gram ror the Glraduate College Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy.

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Calculation of Wideband Ultrasonic Fields Radiated by Water-Coupled Transducers into Anisotropic Media

Cited by 7 publications

References 5 publications

New Developments in Ultrasonic NDT Modeling in CIVA

New Developments in Ultrasonic NDT Modeling in CIVA

Application of Ultrasonic Beam Modeling to Phased Array Testing of Complex Geometry Components

Ultrasonic beam models in anisotropic media

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