Abstract
A simple-structured speed sensor in which a polarization-maintaining optical fiber is used as a Karman vortex generator and also as a vortex frequency sensor had earlier been proposed. For measuring ocean current velocity, a double-fin-type sensor mount was designed and investigated in detail experimentally. Although the experimental results showed its essential effectiveness, several problems were found. A conduit-type sensor mount has newly been proposed for solving these problems. A sensor for this mount has been constructed by using a circular pipe 16 mm in diameter. Experimental studies of the sensor show a wide range of agreement between detected frequencies versus measured flow speeds and the frequencies expected from the Roshko equation. The minimum detectable flow speed is 0.27 m/s. © 1998 Scripta Technica, Electr Eng Jpn, 125(1): 1–8, 1998
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