Force-balance drag anemometer

Details Force-balance drag anemometer Force-balance drag anemometer

G - Physics

01

P

73/5, 73/69

G01P 5/02 (2006.01)

Patent

CA 1200114

TITLE FORCE-BALANCE DRAG ANEMOMETER INVENTORS Roger Van Cauwenberge Jiri Motycka ABSTRACT OF THE DISCLOSURE 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 return- ing the shaft to the neutral position. The actuator generated 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 micro- processor is used to compute the wind speed components or the wind speed and its direction from the electromagnet signals.

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