Abstract
Changes in amplitude and phase of incident waves due to scattering by cylindrical inclusions contained in an isotropic matrix are considered. These changes relate to changes in apparent sonic velocity and attenuation coefficient obtained by the ultrasonic method. The integral equation suggested by Lavrov for scattering waves due to single inclusion gives the changes in amplitude and phase. In order to consider the cases that the number of inclusions contained in the matrix is more than two, the frequency response function corresponding to the frequency response when the incident waves passed through the single inclusion in the matrix was introduced.
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