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

作　　者：ZHAO Xinyu GANG Tie ZHANG Bixing 

机构地区：[1]State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology Harbin 150001 [2]Institute of Acoustics, The Chinese Academy of Sciences Beijing 100190

出　　处：《Chinese Journal of Acoustics》2009年第2期146-153,共8页声学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(50775054,10774158);supported by the International Joint Research Program of China(2007DFR70070).

摘　　要：A nonparaxial multi-Gaussian beam model based on the rectangular aperture is proposed in order to overcome the limitation of paraxial Gaussian beam model which losing accuracy in off-axis beam fields. With the method, acoustical field generated by an ultrasonic linear phased array transducer is calculated and compared with the corresponding field obtained by Rayleigh-Sommerfeld integral, paraxial multi-Gaussian beam model, and Fraunhoffer 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.A nonparaxial multi-Gaussian beam model based on the rectangular aperture is proposed in order to overcome the limitation of paraxial Gaussian beam model which losing accuracy in off-axis beam fields. With the method, acoustical field generated by an ultrasonic linear phased array transducer is calculated and compared with the corresponding field obtained by Rayleigh-Sommerfeld integral, paraxial multi-Gaussian beam model, and Fraunhoffer 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.

分 类 号：O437[机械工程—光学工程] TN821.8[理学—光学]