Abstract:
The characteristics of linear phased arrays are studied by investigating the influence of element size on the ultrasonic beam steering properties. For the phased array transducer which has strict requirement on beam directivity index, the theory analysis indicates that the change of element width and spacing have effect on beam direction. It is shown that element width does not affect on the beamwidth of principal wave and large element width is of benefit to the high acoustic pressure and signal-to-noise; the simultaneous changes of element width and spacing have great influence on beam steering behavior. Finally, the beam directivity of linear phased arrays in which partial element width and spacing changes is simulated, the results agree well with theoretical analysis.
