Title :
A new algorithm to calculate the transient near-field of ultrasonic phased arrays
Author :
Ullate, Luis G. ; Emeterio, José L San
Author_Institution :
Inst. de Autom. Ind., Madrid, Spain
Abstract :
An algorithm valid for an accurate calculation of the near-field in the scanning plane of ultrasonic phased arrays is presented. Using the classical time-domain impulse response approach, a simple analytical expression for the impulse response at points lying in the central plane of a narrow rectangular aperture is decided. An expression for the array impulse response is then obtained by superposition. The proposed solution is useful for an efficient computation of transient and continuous wave (CW) pressure fields without requiring any far-field or paraxial approximations. Moreover, the convolution-impulse response approach applied to phased arrays constitutes an important tool for the analysis of array fields. Some numerical examples are presented, in which the advantages of using the array impulse response in the field analysis are shown. Several aspects of array fields not currently described in literature are included in the examples.<>
Keywords :
acoustic imaging; analytical expression; array fields; array impulse response; central plane; computation; continuous wave pressure fields; convolution-impulse response approach; field analysis; impulse response; narrow rectangular aperture; numerical examples; scanning plane; time-domain impulse response approach; transient near-field; transient pressure fields; ultrasonic phased arrays; Acoustic arrays; Acoustic pulses; Acoustic transducers; Apertures; Convolution; Focusing; Phased arrays; Ultrasonic transducer arrays; Ultrasonic transducers; Wideband;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on