ZHAO Xinyu1 GANG Tie1 ZHANG Bixing2
(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)
Received Apr. 18, 2008
Revised May 19, 2008
Abstract A nonparaxial multi-Gaussian beam 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.
PACS numbers: 43.20, 43.35
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