Measuring and testing – Fluid flow direction – Using a fluid actuated alignment device
Patent
1991-05-17
1993-08-03
Razavi, Michael T.
Measuring and testing
Fluid flow direction
Using a fluid actuated alignment device
7386185, G01W 102, G01P 506
Patent
active
052318761
ABSTRACT:
An apparatus for measuring wind speed and direction includes: a wind vane which has a permanent magnet, an anemometer which has a permanent magnet and a ferromagnetic member, and a stationary housing which has a radially mounted reed switch and an axially mounted reed switch. As the anemometer spins in the wind, the magnet in the anemometer closes the radially mounted reed switch, once per revolution. This produces a signal having a frequency proportional to wind speed. The magnet in the wind vane rotates around the stationary housing to a point determined by the direction of the wind. This magnet produces enough flux to keep the axially mounted reed switch closed. The ferromagnetic member is mounted in the anemometer so that it is interposed between the magnet in the wind vane and the axially mounted reed switch once per revolution. This draws flux away from the axially mounted reed switch, allowing it to open. The result is a second output signal having the same frequency as the first output signal but having a phase, with respect to the first output signal that depends on the wind direction. The direction of the fluid flow is determined by computing the phase difference between the first and second output signals.
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Kiraly Christopher M.
Peet, II William J.
Biegel R. L.
Peet Bros. Company, Inc.
Razavi Michael T.
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