応用物理
Online ISSN : 2188-2290
Print ISSN : 0369-8009
ISSN-L : 0369-8009
超音波像の画像特性
雑賀 憲昭鈴木 達朗
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1975 年 44 巻 5 号 p. 483-490

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A simple equation for the formation of an image for the Bragg Imaging System is derived, in which the effect of the diffraction-limit of the scattered sound waves due to the aperture of the illuminating optical lens and the spread of the linefocussed light are considered. Comparison of calculated and experimental results for one-dimensional objects, show a good coincidence for objects of width over 30 times of the sound wavelength. In the images of objects of such a large size contrast of the edges is sharpened as found through both calculated and experimental results. Especially in the case where penetrating sound waves due to the rotation of the object exists, the effect is remarkable and it seems to be caused by a phase discontinuity between incident and penetrating sound waves at the boundary of the object.

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