Accession Number : ADD001139

Title :   Solid Ultrasonic Lens Doublet.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Folds,Donald L

Report Date : 18 Feb 1975

Pagination or Media Count : 7

Abstract : The patent describes an acoustic lens for underwater use at ultrasonic frequencies that is corrected for thermal variations, spherical aberrations, and coma. The lens is characterized by a rigid, solid plastic first lens element to which is bonded a soft, resilient, solid plastic second lens element, the first element having its greater energy losses concentrated toward the periphery thereof to produce desirable shading effects. Specific examples of prescription fulfillment are provided.

Descriptors :   *Acoustic lenses, *Patents, Underwater sound equipment, Ultrasonic frequencies, Ultrasonic radiation

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE