Acoustic current meter
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United States of America Patent
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-
Dec 20, 1994
Grant Date -
N/A
app pub date -
Mar 11, 1992
filing date -
Mar 11, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An acoustic current meter in which a CW burst is transmitted first in one direction along each acoustic path and then in the reverse direction along such path so that a single receiver system may be used and phase shift and/or d.c. offsets canceled. Four orthogonal components of current are measured so that the axis contaminated by the center support strut may be eliminated from further computation. A direction sensor includes a 3 axis magnetometer using feedback to minimize current requirements and a two axis accelerometer aligned therewith as a tilt sensor.
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