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Drag anemometer

  • US 4,631,959 A
  • Filed: 12/14/1984
  • Issued: 12/30/1986
  • Est. Priority Date: 12/14/1984
  • Status: Expired due to Fees
First Claim
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1. An anemometer for measuring the velocity of a fluid, comprising:

  • a housing having an elongate shaft pivotally mounted therein and projecting therefrom, the shaft being moveable from a neutral position in response to drag forces thereon and returnable to a neutral position in response to electromagnetic forces thereon;

    a drag element mounted on the shaft exterior of the housing;

    electromagnetic means located adjacent to the shaft;

    position sensing means connected to the electromagnetic means for producing signals responsive to the position of the shaft relative to the electromagnetic means; and

    controller means operatively connected between the position sensing means and the electromagnetic means for applying direct current to the electromagnetic means to return the shaft to said neutral position, the current applied to the electromagnetic means being proportional to the speed of the fluid impinging on the drag element.

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