The system described was built to test several techniques for analyzing a forward-scattered sound field whose fluctuations contain information about the field of flow along the acoustic path. The instrument consists of a microprocessor-controlled, radio-linked transmitter with a 4-element transmitting array, a 4-element receiving array, and a receiver incorporating signal-processing, data-logging,and control electronics on a VME bus. Pseudorandom noise coding is used to enhance the signal, with decoding in real time by a high-speed multichannel hardware correlator. The transmit and receive arrays may be configured to test spatial aperture filtering for measuring the mean flow field or to measure the structure function of the refractive-index turbulence. Dual-frequency operation is available for differential-absorption measurements. Results of a field test in a turbulent tidal channel are presented.
An acoustic system for measuring ocean flows by space-time scintillation analysis
Ein akustisches System fuer die Messung von Ozeanstroemungen mittels der Raum-Zeit-Szintillationsanalyse
1987
7 Seiten, 9 Quellen
Conference paper
English
CODIERUNG , TURBULENZ , DECODIERUNG , STROEMUNGSGESCHWINDIGKEIT , STROEMUNGSMESSUNG , SCHALLFELD , KORREKTUR , OZEAN , MEERESFORSCHUNG , STRAHLERGRUPPE , UNTERWASSERSCHALL , HARDWARE , WEISSES RAUSCHEN , MESSEN MECHANISCHER GROESSEN , MESSEN AKUSTISCHER GROESSEN , SCHALLABSORPTION , SCHALLWELLENFILTER , STREUUNG , OZEANOGRAPHIE , MIKROPROZESSOR , SZINTILLATION
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