中文摘要：

提出一种可以控制焦线长度的平凹线聚焦透镜的设计方法.将平凹柱面线聚焦透镜的柱面设计为xOy平面上一个圆弧线绕z轴旋转构成的曲面,利用惠更斯原理,对该形式的透镜建立声学模型,并对其进行数值模拟和仿真.结果表明：在透镜长和宽不变的情况下,可通过控制圆弧的半径和旋转半径两个参数实现对透镜焦线长度的控制.

英文摘要：

The way to control the length of focal line in the plano-concave line focusing acoustic lens is presented.The area of plano-concave cylindrical acoustic lens is changed into a new area formed from a circular arc of xOy plane rotating around the z-axis.Based on the Huygens′ principle,the sound model of the lens is established and the numerical simulation is finished.The conclusion shows that one could control the focal line length of the plano-concave line focusing acoustic lens by changing the radius of arc and the radius of rotation.This work could give some help in the design line focusing acoustic lens.