Note on the Calculation of the Spherically Aberrated Field of an Acoustic Lens
Abstract
A treatment of the propagation of plane sound waves into a hemispherical acoustic lens is presented - first, in terms of geometrical acoustics, showing the utility and the limitations of that approach, and then in terms of a hybrid approach that incorporates geometrical acoustics and wave acoustics. The nature of the spherical aberration that characterizes such systems is investigated, and special attention is paid to the caustics formed. The main result is the determination of the pressure field in the vicinity of the focusing region of the lens. The spherically aberrated field has an ellipsoidal shaped focusing region; its shape is determined by the relative sound speeds of the water external to the lens and the lens fluid.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1992
- Accession Number
- ADA476908
Entities
People
- Kevin L. Williams
- Terence A. Cornelius
Organizations
- University of Washington