Path Averaged Boundary Layer Measurements Beneath Ice Using Acoustic Scintillation

• 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

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.