中文摘要：

根据波的叠加原理分析了矩形空间的超声场分布，并对不同激励方式下的声场分布进行了实验研究。结果发现：单频正弦信号激励时，声源频率越高，声场分布越均匀；多频合成信号激励时，由于声波间的不相干性，声场的空间均匀性比单频信号激励时有显著改善，且频率越高，改善效果越明显。研究表明：就改善声场均匀性而言，应结合超声系统的谐振特性合理选择合成信号的带宽。

英文摘要：

Based on the sound wave superposition principle, the acoustic field distribution in a rec- tangular space is analyzed. The ultrasonic field distributions are experimentally studied under dif- ferent incentives. It can be found that under single frequency sine signal, the sound field induced by higher frequency sound source distribute more uniformity. Because of incoherence among sound waves, the sound field uniformities under synthetic signals are observably improved than the sin- gle frequency signal. Further more the uniformity of sound field is obviously improved as the in- creasing of frequency. The results indicate that the bandwidths of synthetic signals should be choose to gain more uniformity sound field.