Amplitude and Phase of Rayleigh-Angle Reflections of Gaussian Ultrasonic Beams Incident on Liquid/Solid Interfaces.
Abstract
The reflected field generated by a bounded ultrasonic beam incident from a liquid onto the plane surface of a solid at the Rayleigh angle was measured with an immersible acoustic goniometer. Incident beams with gaussian amplitude profiles were generated by apodizing the electric field across the transmitting crystal with a metal-strip electrode behind the crystal. The incident beams were characterized by optical and acoustical measurements. Amplitude and phase were measured in reflections from interfaces between water and aluminum, water and aluminum oxide, and water and stainless steel. The goniometer translated the receiver along a plane perpendicular to the direction of wave propagation, allowing point-by-point measurement across the width of the field. Field amplitude was measured as voltage developed across the receiver crystal; relative phase was measured by synchronizing the receiver ososcilloscope with the transmitted pulse and recording changes in the delay of the received pulse. Some major features in the measured-amplitude profiles resemble features that Bertoni and Tamir illustrate in their solutions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1975
- Accession Number
- ADA016024
Entities
People
- Gerald W. Scott
Organizations
- University of Tennessee