Constant Beamwidth Transducer.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1979
- Accession Number
- ADD006746
Entities
People
- Arnie Lee Van Buren
- Peter H. Rogers
Organizations
- United States Department of the Navy