球面脉冲波在凹椭球面上反射的聚焦声场

对球面脉冲波在四椭球面上反射聚焦，按数字频响求逆法给出脉冲波形的轴向和近轴分布，计算结果对实测波形作出了解释．求出脉冲幅度的空间分布，符合实际观测，说明了声音能量的空间分布特征与四椭球面聚焦器参数和波形参数之间的关系，有利于改善液电式凹椭球面聚焦器的设计．

The Reflecto-focused Sound Field of Spherical Pulse Wave from Concave Ellipsoidal Surface

The axial and paraxial distribution of the reflecto-focused pulse waveform by a concave ellipsoidal surface for the burst of an exponential-cosine pulse at the first focus have been studied in detail. The calculations were performed by the use of a method of solving inverse transformation of the frequency response numerically. With the results of the calculations which are well coincident with the measured pulse, an interpretation to the formation of reflecto-focused pulse waveform has been made. The space distribution of the pulse amplitude was alse obtained, which can give an effective illustration to the relation between the specific acoustic energy distribution and the parameters of focusing radiatior and the radiated pulse. It is favourable for the designation of the hydrauelectric concave ellipsoidal lithotripter.