Accession Number : AD0479708


Title :   INSTRUMENTATION TO DETERMINE THE PRESENCE AND ACOUSTIC EFFECT OF MICROBUBBLES NEAR THE SEA SURFACE.


Descriptive Note : Master's thesis,


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Barnhouse, Pat D C ; Stoffel, Michael J ; Zimdar, Robert E


Report Date : Jan 1964


Pagination or Media Count : 96


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)


Descriptors :   *SEA WATER , ACOUSTIC PROPERTIES , BUBBLES , INSTRUMENTATION , WAKE , SOUND TRANSMISSION , BROADBAND , INTERFEROMETERS , MEASUREMENT , NARROWBAND , ERRORS , UNDERWATER PHOTOGRAPHY , CONFIGURATIONS , SENSITIVITY , PULSE ANALYZERS , ACOUSTIC DETECTORS , ATTENUATION


Subject Categories : Physical and Dynamic Oceanography
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE