摘要
研制了一种厚度模空耦式压电换能器,使用综合考虑材料衰减系数和声阻抗的空耦式压电换能器电力声等效电路理论模型以指导匹配层结构设计和材料选择,选用新型的空心聚合物微珠/环氧树脂复合材料作为声匹配材料,优化设计电阻抗匹配及结构参数。该换能器中心频率为510 kHz,-6 dB频域相对带宽为25.4%,插入损耗为-27 dB。结果表明,使用新型低衰减系数的闭孔复合材料单匹配层设计的该换能器不仅保证了高灵敏度,同时简化了换能器结构,为空耦式压电换能器研制提供了新思路。
A thickness mode air-coupled piezoelectric transducer is manufactured based on an equivalent circuit theoretical model,concerning both the influence of acoustic impedance and attenuation coefficient.Hollow polymer microsphere filled epoxy resin is chosen as the acoustic matching material.Impedance matching circuit and parameter optimization design is given.The central frequency is 51 kHz,-6 dB relative bandwidth is 25.4% and the two-way insertion loss is-27 dB.The result indicates that the new transducer with a low attenuation coefficient closed-pore single matching layer design not only ensures a high sensitivity but also simplifies the structure of the transducer,bringing a new solution for the air-coupled piezoelectric transducer design.
作者
吴樵
陈秋颖
王小民
廉国选
WU Qiao;CHEN Qiuying;WANG Xiaomin;LIAN Guoxuan(Institute of Acoustics, Chinese Academy of Sciences Beijing 100190;University of Chinese Academy of Sciences Beijing 100049)
出处
《声学学报》
EI
CSCD
北大核心
2019年第4期735-742,共8页
Acta Acustica
基金
国家自然科学基金项目(11504407)资助
