Accession Number : ADD006189

Title :   Acoustic Periodic Structure.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Auld,Bertram A

Report Date : 17 Apr 1979

Pagination or Media Count : 5

Abstract : This patent discloses an acoustic periodic structure for slow wave propagation and filtering having a corrugated surface with traction-free boundaries which can support a horizontally polarized shear surface wave that travels much slower than the bulk shear wave velocity and that exhibits an upper cut-off frequency. Electrodes are located on the tops of the teeth forming the corrugated surface and alternate electrodes are excited out of phase, the distribution of the excitation voltage phases determining the particular mode of resonance. (Author)

Descriptors :   *Patents, *Acoustic equipment, *Surface waves, Periodic variations

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE