论文部分内容阅读
在利用二次谐波进行非线性声参量B／A层析成像中，发射换能器的声场特性，尤其是在近场区域的特性对成像结果的定性及定量分析极其重要。本文从理论及实验上分析了圆形平面活塞换能器在传播介质中产生的二次谐波声场，就其对非线性声参量成像的影响进行了分析和讨论．研究结果有助于在非线性声参量成像中降低重建误差，提高分辨灵敏度．
In the nonlinear acoustic parametric B / A tomography using second-order harmonics, the acoustic field characteristics of the transmitting transducer, especially in the near-field region, are of crucial importance for the qualitative and quantitative analysis of imaging results. In this paper, the second harmonic wave field generated by the circular planar piston transducer in the propagation medium is theoretically and experimentally analyzed, and its influence on nonlinear acoustic parametric imaging is analyzed and discussed. The results are helpful to reduce the reconstruction error in nonlinear acoustic parametric imaging and improve the resolution sensitivity.