Accession Number : AD0708373

Title :   DESIGN OF AN IMPROVED ACOUSTIC SYSTEM FOR DETERMINATION OF THE CONCENTRATION OF MICROBUBBLES IN THE OCEAN.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Donaldson,William Jay ; Macfarlane,Byron Noble

Report Date : DEC 1969

Pagination or Media Count : 78

Abstract : An acoustic system was designed to investigate microbubble concentrations and distributions in the ocean. The system consisted of a one-dimensional standing-wave resonator and a reverberation sensor. Concentrations are determined by measurement of the variation in system Q and the change in reverberation level produced by the resonant bubble response. The resonator and the sensor, while functioning independently, both measure bubble concentration as a function of depth and inferred size and thus provide a unique data comparison. The system has been designed to measure bubbles from approximately 700 microns to 30 microns utilizing frequencies from 5 tp 100 kHz at depths to 100 ft. Initial tests utilizing a bubble generator in an anechoic tank have demonstrated the system's capability to measure bubble concentrations. (Author)

Descriptors :   (*SEA WATER, BUBBLES), MEASUREMENT, ACOUSTIC EQUIPMENT, REVERBERATION, RESONATORS, DETECTORS, THESES, UNDERWATER SOUND, SOUND TRANSMISSION

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE