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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Format: | Text |
Language: | English |
Published: |
1989
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Online Access: | http://www.dtic.mil/docs/citations/ADA213596 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA213596 |
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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