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Passive acoustic method of measuring the effective internal diameter of a pipe containing flowing fluids

  • US 5,756,898 A
  • Filed: 12/18/1995
  • Issued: 05/26/1998
  • Est. Priority Date: 06/27/1994
  • Status: Expired due to Fees
First Claim
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1. A method for determining the effective internal diameter of a pipe using non-invasive passive acoustic techniques, comprising the steps of:

  • flowing fluid through a pipe and inducing vibration in said pipe;

    providing at least one vibration sensor in intimate physical contact with said pipe and capable of detecting radial mode vibrations of said pipe in a frequency spectrum range from 2.0 kHz to 30.0 kHz;

    determining a radial mode characteristic frequency and an amplitude of the characteristic frequency of vibration of said pipe in the frequency spectrum range from 2.0 kHz to 30.0 kHz;

    tracking changes of said characteristic frequency and said amplitude; and

    determining from said changes of said characteristic frequency and said amplitude of said radial mode vibration attributable or a function of increasing as decreasing the internal diameter of said pipe.

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