Hai Yu - IEEE Xplore Author Profile

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This paper gives a historical survey of the development of the inhomogeneous wave theory, and its applications, in the field of ultrasonics. The references are listed predominantly chronologically and are as good as complete. Along the historical description, several scientific features of inhomogeneous waves are described. All topics of inhomogeneous wave research are taken into account, such as ...Show More
This paper describes the history and the state of the art in radiation mode theory (RMT) in ultrasonics. The RMT originates from electromagnetism in which it has proved to be very efficient in the field of wave guides and discontinuities. In ultrasonics, the RMT made its entrance only a decade ago and has already proved to be very efficient in describing the interaction of sound with discontinuiti...Show More
The theory, and the use at normal incidence, of shear-vertically polarized waves (with polarization vector in the plane containing the incident wave vector and the normal on the interface) using the mode conversion method has been tackled by others. Here we develop the theory for shear-horizontally polarized incident waves (with polarization vector perpendicular to both the normal on the interface...Show More
The scattering of a Gaussian beam by a rectangular crack is studied by means of the Radiation Mode Model. The influence of a crack on the reflected and transmitted fields of a bounded beam, incident at a critical angle of the L/S/L (liquid/solid/liquid)- and the L/S/V (liquid/solid/vacuum)-structure is investigated.Show More
We outline the fundamentals of an acoustic mode method, suitable to describe scattering and mode conversion phenomena arising in configurations with abrupt or gradual transitions in several spatial directions. The method is applied to three specific problems. First, the validity of a liquid-wedge for the generation of a Stoneley wave (also called Scholte-Stoneley wave) at a liquid-solid interface ...Show More
Instead of an ordinary approach by means of homogeneous waves, more general complex harmonic waves may be used to examine medium vibration properties. It occurs that not homogeneous wave but rather only particular inhomogeneous plane waves can stimulate eigenvibrations of a given structure. The reflection and transmission of such inhomogeneous waves is investigated for plane parallel interfaces as...Show More
Optical polarization effects in an isotropic medium with ultrasonically induced anisotropy are discussed. For parameters in the intermediate diffraction regime, the possibility is shown to change acoustically the state of light polarization in a continuous way from linear to elliptical or circularShow More
On laboratory scale a new NDT technique `acousto-optics' is elaborated for the quality control of layered structures. This technique measures the modulation of ultrasound reflected by a layered material optically in amplitude and phase using laser beams crossing the ultrasonic beams (incident and reflected). The most important characteristics of layered structures investigated are: the thickness a...Show More
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We formulate a mathematical model describing the reflected field of an incident planar monochromatic electromagnetic field illuminating a strip of a surface, which separates two different homogeneous isotropic media, and which is periodic corrugated in the incident plane. The exact solution is an integral expression. An approximation of this integral will be given. The intensity of the reflected f...Show More