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Timed window ultrasonic gas meter with nose cone

  • US 20020011119A1
  • Filed: 12/22/2000
  • Published: 01/31/2002
  • Est. Priority Date: 12/22/1999
  • Status: Active Grant
First Claim
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1. A method of detecting the arrival at a transducer of an acoustic wave packet within a series of acoustic wave packets, said method comprising the steps of:

  • (a) determining a nominal time of propagation of a single acoustic wave packet by;

    (i) simultaneously starting a timer and transmitting said single acoustic wave packet to said transducer;

    (ii) receiving said single acoustic wave packet at said transducer; and

    (iii) identifying a predetermined part of said received wave packet and stopping said timer to thereby determine said nominal time of propagation;

    (b) transmitting said series of acoustic wave packets to said transducer wherein the transmission of any one said wave packet within said series, excepting a first wave packet, is initiated upon detection of arrival at said transducer of an immediately preceding one of said wave packets in said series;

    (c) upon each transmission of said wave packet in step (b) starting a timer; and

    (d) determining when said timer is within a predetermined time of said nominal time of propagation to then enable identification at said transducer of said predetermined part of the corresponding wave packet to thereby detect the arrival of said corresponding wave packet.

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