Force-balance drag anemometer
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United States of America Patent
Stats
-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Mar 19, 1984
filing date -
Apr 15, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The anemometer is for use in measuring two orthogonal velocity components of a fluid, such as air or water. When used to measure wind speed, the wind force acting on a sphere attached to a shaft tends to deflect the shaft from the neutral position. This deflection is measured by optical or electromagnetic sensors which control an electromagnetic actuator which generates a force opposing the wind force thereby returning the shaft to the neutral position. The actuator generates a force proportional to the square of the current applied to the actuator coils. Since the drag force is proportional to the fluid velocity squared (for one dimensional measurement), the wind speed measurement derived from the current applied to the electromagnet will be partly linearized. A microprocessoris used to compute the wind speed components or the wind speed and its direction from the electromagnet signals.
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