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METHOD AND APPARATUS FOR SENSING THE RELATIVE DIRECTION AND VELOCITY OF MOVEMENT OF A BODY IN A LIQUID OR GAS MEDIUM

  • US 3,797,309 A
  • Filed: 07/31/1972
  • Issued: 03/19/1974
  • Est. Priority Date: 07/31/1972
  • Status: Expired due to Term
First Claim
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1. A method of determining the relative direction of movement between a body and a fluid stream in which said body is located comprising the steps of:

  • locating a first sonic vortex sensing arrangement affixed to said body in said fluid stream to obtain a first frequencymodulated signal whose frequency of modulation is related to the relative velocity of movement between said body and said fluid stream, said first sonic vortex sensing arrangement using sonic vortex sensing principles wherein a sonic signal is transmitted toward vortices created in the wake of a strut so that said vortices frequency-modulate said transmitted sonic signal to create said first frequency-modulated signal;

    locating a second sonic vortex sensing arrangement also affixed to said body in said fluid stream to obtain a second frequencymodulated signal whose frequency of modulation is related to the relative velocity and direction of movement between said body and said fluid stream, said second vortex sensing arrangement using sonic vortex sensing principles wherein a sonic signal is transmitted toward vortices created in the wake of the strut so that said vortices frequency-modulate said transmitted sonic signal to create said second frequencymodulated signal; and

    combining said first and second frequency-modulated signals in accordance with a predetermined mathematical relationship to obtain a resultant signal related to the direction of movement between said body and said fluid stream.

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