An improved approximation for the spatial impulse response of arectangular transducer

摘要

One common approximation for a field point located in the farnfield of the transducer is to trapezoidally-shaped function tonapproximate the true spatial impulse response. A quadrilaterally shapednfunction is proposed here. The quadrilaterally shaped function alsonincludes the trapezoidally shaped function as a special case. This papernshows that the quadrilateral approximation applied in the specificallyndefined field location is superior to the trapezoidal approximation fornthe true spatial impulse response function when the transducer elementsnhave the aspect ratio of approximately 10, typical of those found in 1.5nD arrays