Ultrasonic Field of a Transducer behind a Plane Fluid-Solid Interface

Abstract

Ultrasonic echography is one of the methods which are more and more used for non destructive evaluation of materials, according to the requirements of the users who are often increasingly concerned by quantitative evaluation of defects. This requires a better knowledge of the measurement system, as weIl as of the ultrasonic field generated by the transducer inside of the material and this has led us to develop methods for the calculation of this field. We present a method for the determination of the ultrasonic field in a solid medium separated by a fluid-solid plane interface, from the knowledge, by modelization or by measures, of the field in a plane of the fluid medium. The method is based upon a decomposition by a plane waves obtained by spatial Fourier Transform, which permits a simple use of the SNELL-DESCARTES refraction laws at the interface. The method has shown quite good agreement with experimental results. Moreover, this method has permit us to predict undesirable effects in the case of oblique incident beams. NUMERICAL METHon

Modeling the Ultrasonic Radiation of a Planar Transducer Through a Plane Fluid–Solid Interface

“…Souissi [18], for example, decomposed waves from a transducer into plane waves by a spatial Fourier transform method and then simply propagated the plane wave components through the interface, using Snell's law, and numerically summed all such resulting components. Goswami et al [19] used boundary elements on planar and curved fluid-solid interfaces to determine reflected wave fields in the fluid.…”

Modeling the Ultrasonic Radiation of a Planar Transducer Through a Plane Fluid—Solid Interface

“…Souissi [18], for example, decomposed waves from a transducer into plane waves by a spatial Fourier transform method and then simply propagated the plane wave components through the interface, using Snell's law, and numerically summed all such resulting components. Souissi [18], for example, decomposed waves from a transducer into plane waves by a spatial Fourier transform method and then simply propagated the plane wave components through the interface, using Snell's law, and numerically summed all such resulting components.…”

Broadband Fields Radiated in a Solid by Water-Coupled Transducers: A Comparison of Approximate Models, Numerical Approaches and Experiments

“…In between, the field being decomposed as a sum of plane wave components, canonical solutions for plane wave propagation and scattering are used. The implementation used for the results given herein was limited to 2-D configurations and CW excitations [5].…”

“…One of the other methods is a finite element computer code dealing with arbitrary elastic media (heterogeneous and anisotropic) developed by the French Company of Electricity EDF [4). The other method is based on the angular spectrum decomposition technique [5).…”