一种电磁式声电换能器的特性研究  

Characteristic Research on Electromagnetic Acoustic-Electric Transducer

作　　者：姚丽[1] 董卫[1] 吴仲武[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《电声技术》2013年第1期33-38,共6页Audio Engineering

基　　金：教育部科学技术研究重点项目(109073)

摘　　要：设计制作了一种由Helmholtz共鸣器和电磁式换能器组成的电磁式声电转换单元,对其等效输入阻抗和输出电压的频响特性进行了初步探索。实验结果表明,当电磁声电转换单元的等效输入声阻抗最小时其输出电压幅值达到最大,并且通过改变电磁式换能器的结构,能够有效地提高声电转换效果;Helmhotlz共鸣器的谐振频率是影响电磁式声电转换单元谐振频率的主要因素。An electromagnetic acoustic-electric conversion unit consisting of a Helmholtz resonator and the electromagnetic transducer is designed. The equivalent input impedance and output voltage of the frequency response characteristics is pre- liminarily explored through numerical simulation and experiments. Experiment results show that when the equivalent input a- coustic impedance of electromagnetic acoustic-electric conversion unit is minimum, maximum output voltage amplitude can be achieved. The acoustic-electric conversion effect can be improved effectively by changing the structure of the electromag- netic transducer. The resonant frequency of Helmhotlz resonator is the major factor which effects the resonant frequency of electromagnetic acoustic-electric conversion unit.

关 键 词：电磁式 声电转换单元 谐振频率 噪声发电 

分 类 号：TN65[电子电信—电路与系统]