Accession Number : ADD006746

Title :   Constant Beamwidth Transducer.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Rogers ,Peter H ; Van Buren,Arnie Lee

Report Date : 15 Aug 1979

Pagination or Media Count : 15

Abstract : This document discloses a broadband directional transducer, for providing both a beam pattern that is essentially constant for all frequencies above a certain cutoff frequency and an acoustic pressure distribution that is virtually independent of the distance from the transducer, includes a thin spherical cap of transduction ceramic material, the cap having a contour of arbitrary half-angle alpha which is measured from the axis of the cap, and having electrodes placed at the front and back surfaces of the cap such that when a sinusoidal voltage is applied across the electrodes the front surface vibrates sinusoidally with a radial velocity whose distribution over the cap is given by P sub nu (cos Theta), the Legendre function whose root of smallest angle occurs at Theta = Alpha, and where theta is an angle measured from the axis of the cap.

Descriptors :   *Patent applications, *Electroacoustic transducers, Beam forming, Frequency response

Subject Categories : Test Facilities, Equipment and Methods
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE