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提出了一种根据波型转换原理单面评估表面半球形细小凹坑（０．９５～２．５ｍｍ）直径的新方法，用自制的电磁超声换能器测定了纵波（Ｐ波）正入射至多种不同直径的凹坑上后转型横波（ＳＶ波）的标准散射指向图，提出了以４５°和６０°散射方向ＳＶ波的振幅比作为凹坑直径评估的依据，凹坑评估测量值与实际值符合较好．
A new method of single-sided evaluation of the surface hemispherical small pits (0.95 ~ 2.5mm) diameter according to the principle of mode conversion was proposed. By using homemade electromagnetic ultrasonic transducer, The standard scatter plot of shear waves (SV waves) on a variety of dimples with different diameters is proposed. The amplitude ratio of SV waves in the direction of 45 ° and 60 ° scattering is taken as the basis for the evaluation of the dimple diameter. The actual value is in good agreement.