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Phase track system for monitoring fluid material within a container

  • US 4,991,433 A
  • Filed: 09/21/1989
  • Issued: 02/12/1991
  • Est. Priority Date: 09/21/1989
  • Status: Expired due to Fees
First Claim
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1. A method of monitoring an unknown volume of a fluent material within a container, having a specific resonance frequency at a given volume, which comprises directing acoustical energy at an excitation frequency at or near the Helmholtz resonance frequency of the container into the container, sensing acoustical vibrations emitted therefrom having phase characteristics, and measuring the phase relationship of the acoustical vibrations relative to a reference electrical input, and determining the unknown volume of the fluent material within the container based on the thus measured phase relationship for the excitation frequency utilized.

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