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Measurement of relative velocities

  • US 4,248,085 A
  • Filed: 01/03/1979
  • Issued: 02/03/1981
  • Est. Priority Date: 01/03/1978
  • Status: Expired due to Term
First Claim
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1. Apparatus for use in measuring the velocity of a relative movement between a first body and a second body or between a first body and a fluid, comprising at least two detectors which are each adapted to sense noise signals representing disturbances in the fluid or on the second body and which, in use, are mounted on the first body, correlating means associated with the detectors, the correlating means being adapted to generate data for producing at least two cross-correlation or auto-correlation curves from the noise signals detected by the detectors, and means for combining the data generated by the correlating means in such a matter as to enable a more rapid production of a combined cross-correlation or auto-correlation curve from which the said velocity of relative movement can be computed.

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