Path Averaged Boundary Layer Measurements Beneath Ice Using Acoustic Scintillation

Abstract

Path averaged boundary layer measurements were carried during the spring of 1989 at the Oceanography ice camp ('O camp') North of Spitsbergen as part of the Coordinated Eastern Arctic Experiment (CEAREX). In this report, describes the acoustic instrumentation used, summarize the field trip, and talk about the preliminary data analysis and scientific investigation which is underway at the Institute of Ocean Sciences. An acoustic instrument has been developed in order to study the turbulent boundary layer under the Arctic ice cover. The instrument comprises twelve transducers capable of both transmission and reception of a spread spectrum signal centered at 132.3 kHz. Pseudo-random phase-encoded binary sequences are transmitted. Real-time correlation is performed by vector signal processing hardware contained in pressure housings adjacent to each transducer. The accompanying electronics allow the measurement and storage on Video Cassette Recorder (VCR) tapes of time of arrival amplitude and phase of the received acoustic signals.

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Document Details

Document Type
Technical Report
Publication Date
Oct 10, 1989
Accession Number
ADA213596

Entities

Organizations

  • Institute of Ocean Sciences

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Acoustic Arrays
  • Acoustic Signals
  • Boundaries
  • Boundary Layer
  • Carrier Frequencies
  • Data Analysis
  • Flow Fields
  • Frequency
  • Instrumentation
  • Layers
  • Measurement
  • Repetition Rate
  • Signal Processing
  • Software Development
  • Sonar
  • Travel Time
  • Turbulent Boundary Layer

Fields of Study

  • Physics

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Oceanography.
  • Polar and Arctic Studies

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems