Accession Number : ADA289592

Title :   Evaluation of a New Laboratory Acoustic Doppler Velocimeter.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Underwood, Gary N.

PDF Url : ADA289592

Report Date : DEC 1994

Pagination or Media Count : 63

Abstract : A small, rugged and relatively inexpensive velocity meter has been developed to measure uniform and oscillatory water flows in laboratory facilities. The Acoustic Doppler Velocimeter (ADV- 1) is capable of measuring three-dimensional velocities. The ADV- 1 measures velocities from 0 to 2.5 m/s at a sampling rate of up to 25 Hz. The measurements are made in a sampling volume located 5 cm in front of the probe. Since this instrument is new, the objective is to compare the ADV-1 with other laboratory current meters and prepare operational guidelines for the ADV-1 system. Three-dimensional velocities are measured in a wave tank with the ADV-1 horizontal velocity average 0.9 cm/s higher than the laser Doppler anemometer (LDA) and the ADV-1 vertical velocity average 0.93 cm/s lower than the LDA. A horizontal velocity profile is measured in a wave flume by the ADV-1 and a pitot tube, and the instruments differ by 3.5 %. Measuring velocity profiles around a stationary cylinder with the ADV-1 in the wave flume was highly successful, showing the ability of this instrument to measure velocities near structures in future laboratory research. The ADV-1 is portable and can be used for extended periods without recalibration. (jg)

Descriptors :   *WATER FLOW, *LABORATORY TESTS, *ACOUSTIC WAVES, *DOPPLER SYSTEMS, *VELOCIMETERS, TEST AND EVALUATION, VELOCITY, MEASUREMENT, VOLUME, FACILITIES, STRUCTURES, RATES, THREE DIMENSIONAL, PROFILES, CYLINDRICAL BODIES, MEASURING INSTRUMENTS, STATIONARY, SAMPLING, HORIZONTAL ORIENTATION, OCEAN ENVIRONMENTS, PITOT TUBES, FLOWMETERS, GAGES, WAVES, OSCILLATION, DOPPLER EFFECT, LASER ANEMOMETERS.

Subject Categories : Test Facilities, Equipment and Methods
      Inorganic Chemistry
      Acoustics
      Optics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE