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Method of determining pressure within liquid containing vessel

  • US 4,265,251 A
  • Filed: 06/28/1979
  • Issued: 05/05/1981
  • Est. Priority Date: 06/28/1979
  • Status: Expired due to Term
First Claim
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1. A method of determining pressure within a liquid containing vessel, comprising:

  • adding a solid microbubble precursor to said liquid;

    retaining said precursor in said liquid for sufficient time to form a plurality of microbubbles thereby generating a plurality of sonic signals, said precursor forming said plurality of microbubbles at a plurality of times, wherein said precursor is formed to provide each of said microbubbles of a substantially equal selected size, said size being selected to be within a range from about 0.5 micron to about 325 microns;

    measuring a characteristic of said sonic signals representative of the pressure in the liquid, said measuring being of the ultrasonic frequency generated by formation of said microbubbles as a function of said times; and

    determining the pressure in the liquid from the measured characteristic, said determining being of the pressure in the liquid as a function of time.

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