水声宽带换能器阻抗匹配电路设计

Design of impedance matching circuit for underwater acoustic broadband transducer

为提高水声宽带换能器电声转换效率,设计了一种动态阻抗匹配电路。该电路通过模拟开关控制串联电感,实现各频点阻抗匹配的粗调。基于变容二极管容值可变的特性,电路引入变容二极管,实现匹配电路的微量调整。最后对发射端电流进行实时监测,根据监测电流在线调谐电路匹配状态。测试结果表明,在相同发射条件下,采用动态阻抗匹配电路,各码元信号传输距离增加0.5~4.5m,电声转换效率显著提高。

In order to improve the electroacoustic efficiency of the broadband transducer, a dynamic impedance matching circuit is designed. The coarse tuning of matching circuit in every frequency point is implemented by controlling the series inductance with the analog switch. Based on the variable capacitance value of the varactor, the matching circuit is tuned. The current value of transmitting lerminal is monitored in real time, the state of the matching circuit is tuned on-line according to the current value. Test results show that the transmission distance of each code element signal is increased 0.5 4.5 m by using dynamic impedance matching circuit in the same transmitting condition, the electroacoustic efficiency of the broadband transducer is improved significantly.