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Apparatus and method for providing a temperature compensated liquid level measurement

  • US 5,038,611 A
  • Filed: 12/20/1989
  • Issued: 08/13/1991
  • Est. Priority Date: 12/20/1989
  • Status: Expired due to Term
First Claim
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1. A system for providing a temperature compensated measurement indicative of the elevation head of a fluid having a measurable density in a vessel, comprising:

  • an acoustic waveguide in fluid communication with the vessel;

    a reference target positioned within said waveguide;

    ultrasonic transducer means for producing ultrasonic signals in the fluid;

    timing means for measuring a first transit time representative of the time for said ultrasonic signals to travel to and from said target and for measuring a second transit time representative of the time for said ultrasonic signals to travel to and from a surface of a fluid in said waveguide;

    means for calculating the height of the fluid in said waveguide from said first and second transit times; and

    means for determining the density of the fluid in said waveguide from said first transit time, for normalizing the determined density, and for multiplying the calculated height of the fluid by the normalized density of the fluid to provide an indication of the elevation head of the fluid in the vessel.

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