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Phase detector

  • US 6,539,316 B1
  • Filed: 01/06/2000
  • Issued: 03/25/2003
  • Est. Priority Date: 01/06/2000
  • Status: Expired due to Fees
First Claim
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1. A transit time flow meter, comprising:

  • a first pair of transducers;

    a second pair of transducers;

    wherein the first and second pair of transducers are placeable in relation to a conduit to transmit ultrasonic signals through a fluid;

    a phase detector, coupled to the first and second pairs of transducers, the phase detector using duty cycle modulation to determine a first phase difference between signals received from the first pair of transducers and a second phase difference between signals received from the second pair of transducers, the phase detector being responsive to an enable signal for selectively sampling portions of the signals received from the first pair of transducers and the second pair of transducers at selectable sampling start times for a selectable number of pulses in the signals; and

    a data processing circuit, responsive to the phase detector, that generates a measure of fluid flow in the conduit based on the first and second phase differences.

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