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Device for determining and/or monitoring the volume flow rate and/or mass flow rate of a medium to be measured

  • US 7,426,443 B2
  • Filed: 12/15/2004
  • Issued: 09/16/2008
  • Est. Priority Date: 12/23/2003
  • Status: Active Grant
First Claim
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1. A device for determining and/or monitoring volume flow and/or mass flow of a medium flowing through a pipeline in a stream direction comprising:

  • at least two ultrasonic transducers, which emit ultrasonic measuring signals into the pipeline and receive ultrasonic measuring signals from the pipeline; and

    a control/evaluation unit, which ascertains the volume-flow and/or mass-flow of the medium in the pipeline on the basis of the travel-time difference of the ultrasonic measuring signals in the stream direction (S;

    Up) and counter to the stream direction, wherein;

    said control/evaluation unit ascertains a plurality of sampled values (ai with i=1, 2, 3, . . . ) of a received measuring signal at defined points in time (t) of a predetermined time range, interpolates the predetermined time range of the measuring signal by a continuous function (f(t)), the continuous function (f(t)) being formed by a sum of a predetermined number (n ∈

    N) of wavelets (W), wherein each wavelet (W) corresponds to the product of a sampled value with a sine function ( sin

    ( x )
    x
    )
    and with a Gaussian bell curve (e

    α

    x
    2



    R).

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