INSTRUMENTATION TO DETERMINE THE PRESENCE AND ACOUSTIC EFFECT OF MICROBUBBLES NEAR THE SEA SURFACE.
Abstract
The acoustic effects of air bubbles in water have been the subject of much investigation and speculation since the early days of World War II. Preliminary investigations have indicated the probable presence of microbubbles in varying concentrations in the body of the ocean, but their distribution and effect has not been the subject of definitive measurement. The construction and evaluation of equipment for 'in situ' measurement of bubble size and distribution, and bubble-caused sound attenuation is discussed. The determination of bubble size and distribution by photographic means is described, and the superiority of a pulse technique in obtaining sound attenuation is demonstrated. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1964
- Accession Number
- AD0479708
Entities
People
- Michael J. Stoffel
- Pat D. C. Barnhouse
- Robert E. Zimdar
Organizations
- Naval Postgraduate School