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MEASUREMENT OF VELOCITY OF A BODY

  • US 3,804,517 A
  • Filed: 05/01/1972
  • Issued: 04/16/1974
  • Est. Priority Date: 05/04/1971
  • Status: Expired due to Term
First Claim
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1. A method for measuring the speed of a body moving parallel to a surface that has local irregularities, comprising scanning the surface at a first and second area thereof and thereby producing a first and a second signal corresponding to the local irregularities of said first and second area respectively, said first and second areas moving together with said body, and said first area preceding the second area by a predetermined distance in the direction of movement of said body;

  • periodically sampling said first and second signals, thereby oBtaining first and second samples respectively;

    delaying said first samples by a constant whole number of sampling periods;

    multiplying each delayed first sample by the simultaneously appearing second sample, thereby providing a sequence of sample products;

    continuously deriving an average value of said sequence of sample products;

    regulating the period of sampling so that said average value will become maximum; and

    dividing said predetermined distance by the product of said constant whole number and the period of said periodic sampling to provide the speed of the body.

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