基于小波分析的Bessel声场预处理

Bessel field pre-treatment based on wavelet analysis

采用Fourier-Bessel方法对环型换能器的声场进行数值计算,并对仿真声场进行了深入讨论.通过对换能器轴向声压分布的分析,针对声近场明显的扰动,提出一种新的方法对声场进行预处理,即利用小波多分辨率分析降噪,去除近场杂频率成分,提高声压幅度.研究结果表明,小波分析技术能提高Bessel声场的基波成像质量,对于小波变换在Bessel超声成像中的应用提供了很好的依据.

The simulated sound field of an annular ultrasound transducer is given based on Fourier-Bessel series method.After analyzing the axial acoustic pressure,especially the near-field disturbance,wavelet multi-resolution analysis of the noise reduction is carried out for removing the near-field complex frequency components and increasing the sound pressure amplitude.The results show that the wavelet analysis technique can be used for improving the fundamental ultrasound imaging quality of Bessel field.