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研制了一种圆环状高频宽带水声换能器。利用压电复合材料Q值低从而频带宽的特点,采用双环轴向堆叠产生双模态耦合的结构方式拓宽换能器的带宽。通过理论分析与仿真计算,确定敏感元件几何尺寸。用切割-浇注-被覆电极等工艺制备出压电复合材料圆环;再将制备出的外径相同,壁厚不等的压电复合材料圆环轴向叠堆制成叠堆敏感元件,最后灌注防水透声层制成换能器。对制得的换能器进行水下性能测试,测得该换能器谐振频率为410 kHz,最大发射电压响应为150 dB,-3 dB带宽达60 kHz,水平指向性开角(-5 dB)为360°,-3 dB垂直指向性开角约20°。结果表明将复合材料圆环轴向堆叠可显著拓展换能器的带宽,且实现声波的水平全向发射。
Developed a ring-shaped high-frequency broadband acoustic transducer. Utilizing the low Q value of the piezoelectric composite material and the characteristic of the frequency bandwidth, the bandwidth of the transducer is broadened by adopting the structure mode of double-mode axial coupling of the double-ring stack. Through the theoretical analysis and simulation calculation to determine the sensor geometry. Piezoelectric composite rings are prepared by the processes of cutting-casting-coating electrodes and the like; and then the annular piezoelectric composite rings with the same outer diameter and different wall thicknesses are axially stacked to form a stack of sensitive components, finally Permeable waterproof translucent layer made of transducers. The transducer was tested for underwater performance. The transducer was found to have a resonant frequency of 410 kHz, a maximum transmit voltage response of 150 dB, a -3 dB bandwidth of 60 kHz, and a horizontal directional open angle of -5 dB ) Is 360 °, and -3 dB vertical directivity is about 20 °. The results show that axially stacking the composite rings can significantly expand the bandwidth of the transducer and achieve horizontal omnidirectional emission of acoustic waves.