A Simulation Study of the Beam Steering Characteristics for Linear Phased Arrays

Ultrasonic beam steering characteristics for linear phased array transducers are simulated numerically by visualizing the full-field acoustic pressure field of the waves radiated from a linear phased array transducer. The influences of various transducer parameters on the beam steering properties are studied, including number of elements, inter-element spacing, element size, frequency of the transducer and the steering angle. In addition, the effects of these parameters on the near field characteristics are investigated by analyzing the acoustic pressure profile in the steering direction. The simulation results agree well with the analytical solutions which are valid only in the far field. A suggested scheme for optimal transducer design is presented.

[1]  D.H. Turnbull,et al.  Beam steering with pulsed two-dimensional transducer arrays , 1991, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[2]  M. G. Silk,et al.  Ultrasonic Transducers for Nondestructive Testing , 1984 .

[3]  A. Macovski.  Ultrasonic imaging using arrays , 1979, Proceedings of the IEEE.

[4]  Hong Wang,et al.  Phase aberration correction and motion compensation for ultrasonic hyperthermia phased arrays: experimental results , 1994, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[5]  P N Wells,et al.  The present status of ultrasonic imaging in medicine. , 1993, Ultrasonics.

[6]  G. Kino,et al.  Transducer Arrays Suitable for Acoustic Imaging , 1975 .

[7]  P. Bardouillet.  Application of electronic focussing and scanning systems to ultrasonic testing , 1984 .

[8]  Shi-Chang Wooh,et al.  Optimization of Ultrasonic Phased Arrays , 1998 .

[9]  Shi-Chang Wooh,et al.  Optimum beam steering of linear phased arrays , 1999 .

[10]  M. Lethiecq,et al.  An ultrasonic array-based system for real-time inspection of carbon-epoxy composite plates , 1994 .

[11]  J.-L. Thomas,et al.  Ultrasonic beam focusing through tissue inhomogeneities with a time reversal mirror: application to transskull therapy , 1996, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[12]  Y.J. Yoon,et al.  Ultrasonic phased arrays with variable geometric focusing for hyperthermia applications , 1992, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[13]  Stephen W. Smith,et al.  Beam Steering with Linear Arrays , 1983, IEEE Transactions on Biomedical Engineering.

[14]  S.W. Smith,et al.  High-speed ultrasound volumetric imaging system. I. Transducer design and beam steering , 1991, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[15]  Michael Kröning,et al.  DESIGN AND OPTIMIZATION OF A MULTIFUNCTIONAL PHASED ARRAY SEARCH UNIT , 1996 .

[16]  S.W. Smith,et al.  High-speed ultrasound volumetric imaging system. II. Parallel processing and image display , 1991, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[17]  J. Krautkrämer,et al.  Ultrasonic Testing of Materials , 1969 .

[18]  Pai-Chi Li,et al.  Optimizing the radiation pattern of sparse periodic linear arrays , 1996, IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control.

[19]  A. Weyman.  Principles and Practice of Echocardiography , 1994 .

[20]  Shi-Chang Wooh,et al.  Three-dimensional beam directivity of phase-steered ultrasound , 1999 .

[21]  Jan Drewes Achenbach,et al.  A simple scheme for self-focusing of an array , 1995 .

[22]  Shi-Chang Wooh,et al.  Influence of phased array element size on beam steering behavior , 1998 .