基于空间冲激响应的圆形换能器辐射声场研究

基于空间冲激响应的稳态声压场理论,从选取距离函数出发,建立了单阵元圆形平面换能器声场中任一场点处的基于傅里叶变换的冲激响应声场模型,该模型适用于声场中的任意位置。并运用Matlab仿真了换能器的轴向与径向声压分布,且在圆形换能器冲激响应的声压分布实验系统上进行验证,实验结果与仿真得到的声压场具有很好的一致性。实验验证表明,仿真结果可准确反映圆形换能器的空间辐射声场分布。该方法计算快捷,对于优化圆形换能器设计参数及提高超声成像检测分辨率有重要参考意义。

Study on Acoustic Pressure Field of a Circular Ultrasonic Transducer Based on Spatial Impulse Response

Based on the theory of spatial impulse response of steady state ultrasound pressure field distribution, an expression of the Fourier transform of the impulse response for a circular piston at any space point was analyzed, which was applicable to any position of the acoustic field. The axial and radial distribution of the acoustic pressure was simulated with Matlab, and also a circular transducer impulse response of the acoustic pressure distribution experiment system was designed to validate, the experimental results and simulation results showed a good consistency. The experimental results proved that the simulation results could accurately express the acoustic radiation pressure distribution of a circular transducer. This approach could be calculated quickly, and it was of great significance to optimize the transducer design and improve the resolution and reliability of ultrasonic testing.