Path Averaged Boundary Layer Measurements Beneath Ice Using Acoustic Scintillation

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...

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Bibliographic Details
Other Authors: INSTITUTE OF OCEAN SCIENCES SIDNEY (CANADA)
Format: Text
Language:English
Published: 1989
Subjects:
Snow
Ice and Permafrost
Acoustics
*TURBULENT BOUNDARY LAYER
*UNDERICE
*SCINTILLATION
*UNDERWATER ACOUSTICS
PROCESSING EQUIPMENT
CORRELATION
VECTOR ANALYSIS
INSTRUMENTATION
ACOUSTIC SIGNALS
ACOUSTIC EQUIPMENT
ARRIVAL
AMPLITUDE
VIDEO RECORDING
ELECTROACOUSTIC TRANSDUCERS
ARCTIC REGIONS
OCEANOGRAPHY
SPREAD SPECTRUM
BOUNDARY LAYER
REAL TIME
MEASUREMENT
SIGNAL PROCESSING
DATA PROCESSING
CEAREX(COORDINATED EASTERN ARCTIC EXPERIMENT)
Arctic
Ice
permafrost
Spitsbergen
Online Access:http://www.dtic.mil/docs/citations/ADA213596
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA213596
Description
Summary: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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