MODEL TANK STUDY OF THE COHERENCE OF UNDERWATER ACOUSTIC SIGNALS REFLECTED FROM COMPLEX STRUCTURES.
Abstract
The spatial coherence of wide band ultrasonic continuous noise signals reflected from and/or transmitted through plates, cylinders, spheres, and complex combinations of these structures, was determined. The measurements were made in a model water tank, in an approximately one octave band, centered at about one megahertz. The reflected signals were found to always be spatially coherent, except when the reflecting structure gave rise to more than one independent reflection. The coherence of the transmitted signal was severely degraded under a number of conditions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1966
- Accession Number
- AD0651650
Entities
People
- Joseph A. Aukward
- Marvin S. Weinsteh