阐述了电声换能器的设计理论与理想状态实现的困难与途径。
It also points out the difficulties and methods of the designment theory of Electroacoustic Transducer and the realization of the ideal condition.
与其他聚焦方式相比，多元组合聚焦超声换能器具有较大的聚焦深度、较理想的焦域以及较高的声强度等优点，并且聚焦区域和声强度易于控制。
Comparing with other kinds of focusing methods, it has a lot of merits: a deeper focal length, a greater ultrasound intensity and an ideal focal region and all of them are easily controlled.
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