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In this article, three-dimensional Kirchhoff inverse scattering method is modified to convenient form for a cylindrical specimen that includes three-dimensional defects including two-circle voids. Ultrasonic measurements are carried out. The measurement area in the modified methods is restricted in the plane perpendicular to the axis of cylindrical specimen. That's to say that the method is modified...
In recent years, research on propagation characteristic of wave in inhomogeneous media attracts much attention among experts and scholars in various domains. First, mathematic expression for scattering cross section P(ω) in inhomogeneous is deduced. Then, quantization of Kramers-Kronig relation in inhomogeneous medium containing scatterers is given. Based on the frequency change, the phase velocity...
In this article, three dimensional Kirchhoff inverse scattering method is modified to convenient form for two cylindrical specimens that include three dimensional defects. Two inhomogeneous cylinders with flaw models are prepared and ultrasonic measurements are carried out. The measurement area in the modified methods is restricted in the plane perpendicular to the axis of cylindrical specimen. That's...
The objective of this paper is to predict the flaw response in an inhomogeneous solid medium. Multi-Gaussian Beam (MGB) model is used to represent the incident ultrasonic beam. The effect of ultrasonic attenuation and phase velocity dispersion due to grain scattering is included in the predictions. The variation of received voltage is analysed against the distance of the flaw from the transducer for...
This paper deals with an inverse problem based on the simultaneous use of the Finite Element Method (FEM) and the experimental method for the shape reconstruction of defects in inhomogeneous material. In a cylindrical specimen including different defects, a classic 2D finite element method is used for flaw echo computations. Results obtained from such calculations are used as the data for the inverse...
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