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常规的厚度模压电陶瓷换能器需要在压电陶瓷片的两个大面上接线.但是前表面的接线对于小换能器(直径小于1mm)和阵列换能器不利.两面接线还不便于批量生产,也不便于和匹配层的耦合.D.E.Laughlin等人1985年曾制作了如图1所示的小换能器.这种换能器的背电极分割成两半,分别连接电源的两极.前表面的电极不连线,与常规换能器不同,这种换能器工作时压电片的两半作反相振动,一半伸张时,另一半压缩;一半压缩时,另一半伸张.实测表明,这种换能器的声场由两个独立的声束组成(图2).
Conventional thickness molded ceramic transducers require wiring on the two large faces of the piezoelectric ceramic plate, but the front face wiring is not good for small transducers (less than 1 mm in diameter) and array transducers. Easy to mass production, but also not easy to match with the matching layer .DELaughlin et al 1985 produced a small transducer as shown in Figure 1. This transducer back electrode is divided into two halves, respectively, connected to the power supply Bipolar. The front surface of the electrode is not connected, and conventional transducers are different, the transducer work when the two piezoelectric films for anti-phase vibration, one half when the other half of the compression; half of the compression, the other half of the stretch The measurements show that the sound field of this transducer consists of two independent beams (Figure 2).