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Ultrasonic system for measuring fluid impedance or liquid level

  • US 4,320,659 A
  • Filed: 01/11/1980
  • Issued: 03/23/1982
  • Est. Priority Date: 02/27/1978
  • Status: Expired due to Term
First Claim
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1. An ultrasonic system for measuring at least one selected impedance related parameter of a fluid comprisinga solid member capable of supporting the propagation of moderately directional, bulk SV shear waves without mode conversion,transducer means acoustically coupled to said member for generating and detecting said SV waves propagated along a multiply-reflected path that includes at least two reflections in a region of said member remote from said transducer means and is at least partially immersed in said fluid to form a solid-fluid interface, said reflections having an angle of incidence that exceeds the first critical angle by at least five degrees and is at least ten degrees less than the second critical angle,said path lying in a portion of said member that is substantially homogeneous and flaw free and said SV waves having a frequency that lies in the range of 0.5 to 5 MHz to minimize energy loss by absorption and maximize energy loss by coupling to said fluid at said reflections in said remote region, andmeans for sensing the attenuation of said waves along said path at said interface to measure said selected impedance related parameter.

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