Book ChapterDOI
The Ultrasonic Field of Focused Transducers Through a Liquid-Solid Interface
M. El Amrani,P. Calmon,Olivier Roy,D. Royer,O. Casula +4 more
- pp 1075-1082
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TLDR
In this paper, the authors present theoretical and experimental results on the ultrasonic field of focused immersion transducers in steel blocks, where the authors use the Rayleigh integral to calculate the radiation of the transducers at normal or oblique incidence.Abstract:
This paper presents theoretical and experimental results on the ultrasonic field of focused immersion transducers. The French Atomic Energy Commission (C.E.A.) has developed a software which calculates the ultrasonic field produced by a focused (or unfocused) transducer through a liquid-solid interface at normal or oblique incidence. The radiation of the transducer is formulated by the method of the Rayleigh integral, extended to take into account the liquid-solid interface. Firstly we describe this model, then we present measurements of the ultrasonic field produced by focused transducers in steel blocks. Experiments have been made using, at low frequencies, an electrodynamic probe, and, at high frequencies, an optical probe.read more
Citations
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Journal ArticleDOI
Models for the computation of ultrasonic fields and their interaction with defects in realistic NDT configurations
TL;DR: In this paper, two models developed for several years at the French Atomic Energy Commission (CEA) for quantitative ultrasonic non-destructive testing (subsequently denoted by NDT) require simulation tools for cost-effective research and engineering works.
Journal ArticleDOI
A theoretical study of ultrasonic wave transmission through a fluid-solid interface.
TL;DR: A model for the study of the transient ultrasonic waves radiated by a transducer in a liquid and transmitted into a solid through a plane interface based on the decomposition of the ultrasonic field, in impulse plane waves is developed.
Proceedings ArticleDOI
Calculation of wideband ultrasonic fields radiated by water-coupled transducers into heterogeneous and anisotropic media
Nicolas Gengembre,Alain Lhémery +1 more
TL;DR: In this paper, the authors describe the extension of the model Champ-Sons developed at the French Atomic Energy Commission to predict transient fields radiated from arbitrarily shaped sources into such pieces, for which numerical efficiency is required.
Journal ArticleDOI
A computational method to calculate the longitudinal wave evolution caused by interfaces between isotropic media
TL;DR: A computational method to calculate the reflected and transmitted ultrasonic fields at interfaces of complex geometry by applying the Rayleigh-Sommerfeld integral to the whole, extended interface is presented.
Proceedings ArticleDOI
Results of the 2005 UT Modelling Benchmark Obtained with the CIVA Software Developed at the CEA
TL;DR: The CIVA software developed at the French Atomic Energy Commission for processing and simulating NDT data includes tools for modeling the whole ultrasonic inspection of a component in which virtual defects are positioned as mentioned in this paper.
References
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Journal ArticleDOI
Theory of Focusing Radiators
TL;DR: In this article, the authors derived an approximate theory of the sound field due to a concave spherical radiator, vibrating with uniform normal velocity, and showed that the ratio of the intensity at the center of curvature to the average intensity at radiating surface is nearly equal to (2πh/λ)2 where h is the depth of the concave surface and λ is the wave length.
Journal ArticleDOI
Optical probing of the mechanical impulse response of a transducer
D. Royer,E. Dieulesaint +1 more
TL;DR: In this paper, the mechanical impulse response of a piezoelectric transducer has been plotted by using an optical interferometric heterodyne probe, which is better than 10−4 A/(Hz)1/2.
Journal ArticleDOI
Continuous field radiated by a geometrically focused transducer: Numerical investigation and comparison with an approximate model
TL;DR: In this article, a new numerical method is presented based on two expansions of the pressure field into spherical harmonics in two conveniently chosen domains, and the expansions are then matched by making a comparison with the exact analytical solution for planar case.
Journal ArticleDOI
Refraction of Waves from a Point Source into a Medium of Higher Velocity
TL;DR: In this paper, a point source is placed in one medium and the fields in a second medium, separated from the first by an infinite plane boundary, are calculated for the case that the wave velocity in the second medium exceeds that in the first medium.
Journal ArticleDOI
The total reflection of a sound pulse of arbitrary form
TL;DR: In this article, the problem of a sound pulse of arbitrary form incident on a half space with an angle of incidence greater than the critical angle is discussed, and an expression for the energy flux across the interface is shown that the net energy flow per unit area over all time is zero.