Calculation of radiation acoustical fields from phased arrays with nonparaxial multi-Gaussian beam model

• 来源期刊: 声学学报（英文版）
• 年，卷（期）: 2009,（2）
• 页码范围: 146-153
• 页数: 8页
• 语种: 英文

摘要

A nonparaxial multi-Gaussian beam model based on the rectangular aperture is proposed in order to overcome the hmitation of paraxial Gaussian beam model which losing accuracy in off-axis beam fields. With the method, acoustical field generated by an ultra-sonic linear phased array transducer is calculated and compared with the corresponding field obtained by Rayleigh-Sommerfeld integral, paraxial multi-Gaussian beam model, and Fraunhof-fer approximation method. Simulation examples show that nonparaxial multi-Gaussian beam model is not limited by the paraxial approximation condition and can predict efficiently and accurately the acoustical field radiated by a linear phased array transducer over a wide range of steering angles.