中文摘要：

换能器与功率放大器之间的匹配网络设计是宽带大功率水声发射系统的关键技术之一。把水声换能器、功率放大器及其联系两者的匹配网络视为一整体，从系统的观点出发，提出了一种分频段匹配宽带水声换能器的处理方法。通过对水声换能器的导纳特性和发射电压响应的分析，合理地选择匹配网络参数。该方法能充分发挥换能器在不同频段中的特性，实现水声发射系统的宽频带工作。水池实验验证了该方案的有效性：在2～16kHz带宽范围内，发射电压响应级起伏△TVR和发射声源级起伏△SL均得到改善，尤其在感兴趣的4～15kHz的宽带范围内，功率因数得到显著改善，功放管耗明显降低，发射电压响应级起伏ATVR从21dB降到14dB，发射电压声源级起伏△SL从24dB降到7dB，但对功放的安全保护电路提出了更高的要求。

英文摘要：

Matching network design between the transducer and the power amplifier is one of the key techniques for the broadband, high power underwater acoustic transmitter system. Treating the transducer, the power amplifier and the matching network as one entirety, a new piecewise matching method was proposed. By analyzing the admittance characteristics and the transmitting voltage response of the transducer, the matching network parameters were chosen reasonably. With the goal of increasing transmitting bandwidth and improving power factor, the new piecewise matching method provides a good performance. The water-tank experiments show for the bandwidth of 2 - 16 kHz, both the fluctuation dynamic range of transmitting voltage response level ATVR and the transmitting source level ASL are well-controlled; especially for the interested bandwidth of 4 - 15 kHz, the power factor is increased and the power dissipation is reduced obviously, the fluctuation dynamic range of transmitting voltage response level ATVR decreases from 21 dB to 14 dB, the fluctuation dynamic range of the transmitting source level ASL decreases from 24 dB to 7 dB, however, the better protection circuit is required to the power amplifier of the system, which demonstrate the effectiveness of the system.