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为获得三频或宽频带超声波传感器，本文提出了一种新型双层压电结构超声波传感器．文中从理论上分析研究了电容对其频率特性控制的原理，同时，在2MHz频率范围进行了实测验证，理论与实测结果吻合较好．
In order to obtain tri-band or broadband ultrasonic sensors, a novel double-layer piezoelectric ultrasonic transducer is proposed in this paper. In this paper, the principle of capacitance control on its frequency characteristics is theoretically analyzed. Simultaneously, the experimental verification is carried out in the frequency range of 2MHz. The theoretical and experimental results are in good agreement.