Force-balance drag anemometer

Details Force-balance drag anemometer Force-balance drag anemometer

1984-03-19

1986-12-30

Ruehl, Charles A.

Measuring and testing

Navigation

Leeway incidence or side-slip

7386261, G01P 502, G01L 108

Patent

active

046319581

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.

REFERENCES:
patent: 3077783 (1963-02-01), Stiles et al.
Dessuveault et al., "The Design of a Thrust Anemometer for Drifting Buoy", Ocean 81 Conference Record (IEEE), Sep. 1981, pp. 411-414.

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