说明：  :提出了一种新型的双层压电结构超声波传感器,借助于移相电容器的移相作用,改变各压电层的 激励电压的幅值和相位,实现对传感器频率特性的控制,从而得到了具有宽频带高效率的超声波传感器,为研究宽带高效超声波传感器探索了一条新的途径
(: A novel two-layer structure of piezoelectric ultrasonic sensors, by means of phase-shifting phase-shifting the role of capacitors, piezoelectric layer to change the excitation voltage amplitude and phase, to achieve control of the frequency characteristics of the sensor, which has been with broad-band high efficiency ultrasonic sensor for the study of high-performance broadband ultrasonic sensors to explore a new way)