研究了聚焦换能器的优化设计，对透镜厚度及材料的选取进行了分析。
Optimum design of focused transducers is studied, and the selection of thickness of lens and materials is discussed.
该文应用坐标变换法对该聚焦换能器的复杂声场分布进行了数值计算，并测定了其声功率。
The complex sound field distribution of the focused transducers was calculated by the coordinate transform method, and the acoustic power was measured.
文章基于目前常用的凹球面自聚焦换能器，提出了解决上述问题的方案，设计了新型的换能器，对其工作方式及声场特性进行了研究。
This paper presents some methods for solving the problem based on current concave spherical transducers and new transducer designs. The working principle is then studied.
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