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Noninvasive method for determining the liquid level and density inside of a container

  • US 6,053,041 A
  • Filed: 02/27/1995
  • Issued: 04/25/2000
  • Est. Priority Date: 02/27/1995
  • Status: Expired due to Term
First Claim
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1. A method for determining the location of the liquid/gas interface of a liquid-containing enclosure, said method comprising the steps of:

  • (a) applying an acoustic sine wave burst having a chosen frequency to a wall of the enclosure which is disposed approximately perpendicular to the liquid/gas interface, establishing thereby a flexural wave in the wall;

    (b) detecting the flexural wave generated in the wall at a point on the wall nearby to the location of application of the sine wave burst and in a direction substantially parallel to the liquid/gas interface therefrom; and

    (c) measuring the phase difference between the sine wave burst and the detected flexural wave;

    whereby the location of the liquid/gas interface is determined when a change in the magnitude of the phase difference is observed.

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