Abstract One common approximation for a field point located in the far field of the transducer is to use a trapezoidally-shaped function to approximate the true spatial impulse response. A quadrilaterally shaped function is proposed here. The quadrilaterally shaped function also includes the trapezoidally shaped function as a special case. This paper shows that the quadrilateral approximation applied in the specifically defined field location is superior to the trapezoidal approximation for the true spatial impulse response function when the transducer elements have the aspect ratio of approximately 10, typical of those found in 1.5 D arrays.
1998 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 45:76-83
© 1998, by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.