连续球面波在凹椭球面上反射的聚焦声场

为分析液电式粉碎肾结石机中的聚焦声场，首次给出单频球面波在凹椭球面上反射聚焦的线性理论关系，求出各频率反射波场的轴向和侧向分布．结果表明：单频球面波的焦点邻区近似单叶双曲面体；聚焦斑的最大声强随焦斑半径是反平方变化；最大声强与偏心率具有单调函数关系；声压幅度侧向分布在焦区近似正态函数和在焦平面上为正态函数．

Focused Sound Field Due to Reflection of Spherical Continuous Wave from Concave Ellipsoidal Surface

For the purpose of analyzing the focused sound field in the electrohydraulic Extracorporeal Shock Wave Lithotripter, a theoretical formula of the reflecto-focused sound field caused by the scattering of spherical continuous wave from the concave ellipsoidal surface has been initially founded. By the use of the formula, the axial and lateral distribution of the reflectofocused sound field have been calculated in detail. It is pointed out that the focal region is roughly hyperboloid of one sheet, the maximum intensity of the focal spot is inversely proportional to the square diameter of the focal areal the maximum intensity is a monotonous function of the eccentricity and the aperture, and the lateral pressure amplitudes are quasinormally distributed in the focal region and normally distributed in the focal plane.