凹面相控阵聚焦声场在液固界面上的反射和折射

开展了凹面线性相控阵列辐射声场在液固界面上的反射和折射特性研究，利用射线近似方法，得到了凹面相控阵聚焦声场在液固界面上反射和折射后的声场渐近解析表达式，对声波在液固曲面上的反射和折射声场进行了分析和讨论. 利用这个解析表达式，对凹面线性聚焦声场在液固平界面和液固圆柱界面情况下固体中折射纵波和折射横波的相控阵声场进行了分析和讨论，发现凹面线阵声场在液固圆柱界面下比液固平界面具有更好的聚焦效果. 关键词： 凹面阵列 超声相控阵 反射与折射

Reflection and refraction on the fluid-solid interface of acoustic field excited by a concave phased array

The reflection and refraction on the fluid-solid interface of the acoustic wave excited by a concave phased array are studied in this paper. The analytical presentations of the refraction and reflection fields of the focused acoustical wave on the fluid-solid interface are obtained for the first times by the ray approximation method. The refraction fields in the solid are analyzed and discussed. The ultrasonic phased fields of the refraction compressional and shear waves in the solid are numerical simulated and investigated by the analytical presentations. It is found that the compressional and shear waves are better focused in the solid with a cylindrical fluid-solid interface than in that with a planar fluid-solid interface.