【摘要】 针对近轴近似的多高斯声束模型无法准确计算离轴区域声场的问题,我们提出了一个矩形源的非近轴近似多高斯声束模型,用于计算偏转聚焦时线性相控阵换能器辐射的声场。利用该方法计算了由矩形阵元组成的相控线阵的辐射声场,并与瑞利积分、近轴近似方法及夫琅和费近似方法进行了分析和对比,计算结果表明该方法克服了常规近轴近似条件的限制,可以准确、快速地计算较大偏转范围内的换能器辐射声场,在计算相控阵换能器偏转聚焦声场中具有独特的优势。更多还原

【Abstract】 In order to overcome the limitation of paraxial Gaussian beams model losing accuracy in off-axis beam fields, a nonparaxial multi-Gaussian beam model for a rectangular aperture is proposed.With the help of this method,beam fields generated by an ultrasonic linear phased array transducer are calculated and compared with the corresponding fields obtained by Rayleigh-Sommerfeld integral model,paraxial multi-Gaussian beam model and Fraunhoffer approximation respectively.It is shown that nonparaxial multi-Gaussian beam mode is not limited by paraxial approximation condition, and can efficiently and accurately predict the radiation beam field of a linear phased array transducer over a wide range of steering angles.更多还原