圆环状复合材料高频宽带水声换能器

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。 

High frequency wide band underwater acoustic transducer for ring shaped composite material

A kind of circular ring high frequency wide band underwater acoustic transducer is developed, By using the Low Q value and broadband characteristics of the piezoelectricity composite material, and the dual mode coupling is used to broaden the bandwidth of the transducer by double ring stacking along the axial direction. Through theoretical analysis and simulation calculation, the geometric dimensions of the sensitive components are determined. By cutting piezoelectric ceramics-filling the flexible polymer-coating electrode the piezoelectric composite rings are processed. And then the stack sensitive element can be made by stacking two piezoelectric composite rings with the same outer diameter and different thickness in axial direction. Finally, the transducer can be made by pouring waterproof permeable, the performance of transducer has also been tested in the water and the test results show that the resonant frequency is 410 kHz, the maximum transmit voltage response is 150 dB, the -3 dB bandwidth can reaches 60 kHz, the horizontal direetivity (-5 dB) is 360°, and the vertical direetivity (-3 dB) is 20°. It is shown that the bandwidth of the transducer can be enlarged remarkably by using the method of stacking two different thickness piezoelectric composite rings along the axial direction, And the horizontal omnidirectional emission of acoustic wave can be realized.