Accession Number : ADD015139

Title :   Underwater Acoustic Data Acquisition System.

Descriptive Note : Patent, Filed 1 Jun 90, patented 10 Sep 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Gafos, Adamandios G ; Maxwell, Donald ; Halliwell, Frank S ; Lynn, Dana C ; Sears, Christopher N

Report Date : 10 Sep 1991

Pagination or Media Count : 10

Abstract : An acoustic data acquisition system for shipboard use is disclosed that permits underwater acoustic data measurements at preselected submerged marine structural coordinates using a free swimming, quiet dynamically positionable remotely operated vehicle (ROV). The disclosure also provides a method of performing acoustic data acquisition with an ROV by first inputting the marine structural features by use of a computer aided design subsystem, determining the required trajectory path and hovering coordinates for data measurements, next, establishing the acoustic telemetry system for the ROV's control system to operate within and make an absolute positional fix to the marine structure's coordinates then, establish the ambient acoustic conditions of the worksite. The system, monitored and controlled from a computer based system, includes an ROV subsystem that operates in conjunction with a computer based long baseline underwater telemetry and positioning control subsystem, an acoustic transducer array attached to the ROV and a real-time data-coordinate storage subsystem. A particular type of transducer suitable for use with this vehicle is a passive acoustic transducer array (hydrophones) that measures low level sound pressures and phase data that provides a detailed description of the sound power field emitted over the surface of the underwater structure. Applications include oil/gas pipeline leak detection and location of malfunctioning underwater marine equipment.

Descriptors :   ACOUSTIC ARRAYS, ACOUSTIC DATA, ACOUSTIC DETECTORS, ACOUSTIC EQUIPMENT, ACOUSTIC FIELDS, ACOUSTIC MEASUREMENT, ACOUSTICS, COMPUTER AIDED DESIGN, COMPUTERS, CONTROL SYSTEMS, COORDINATES, DATA ACQUISITION, ELECTROACOUSTIC TRANSDUCERS, HOVERING, HYDROPHONES, LOW LEVEL, MARINE ENGINEERING, MEASUREMENT, PASSIVE SYSTEMS, PATHS, POSITION FINDING, POSITION(LOCATION), POWER, PRESSURE, REMOTE CONTROL, SHIPBOARD, SOUND, STRUCTURAL PROPERTIES, SURFACES, TELEMETER SYSTEMS, TRAJECTORIES, TRANSDUCERS, UNDERWATER, UNDERWATER ACOUSTICS, UNDERWATER EQUIPMENT, VEHICLES

Subject Categories : Acoustic Detection and Detectors
      Submarine Engineering
      Underwater and Marine Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE