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文中介绍了超声通过界面时的折射规律，说明凹声透镜和凸声透镜超声聚焦的原理，提出了可以利用声透镜扩大井下超声换能器的作用范围从理论上设计了井下超声聚焦系统。
In this paper, the refraction law when ultrasound passes through the interface is introduced, the principle of ultrasonic focusing of concave and convex lenses is introduced, and the downhole ultrasonic focusing system can be theoretically designed by using acoustic lenses to expand the range of downhole ultrasonic transducers.