Graeper Wilhelm

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  • Technical Report
    Moored acoustic travel time (ATT) current meters : evolution, performance, and future designs
    (Woods Hole Oceanographic Institution, 1979-12) McCullough, James R. ; Graeper, Wilhelm
    New laboratory measurements and numeric model studies show the present folded-path ATT current meters are stable and sensitive, but are not well suited for mean flow observations in surface gravity waves. Alternate designs which reduce unwanted wake effects are proposed. ATT flowmeter history, principles of acoustic flow sensors, mean flow near cylinders, and the need for linear flow sensors are reviewed.