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Non-intrusive liquid flow detection apparatus

  • US 5,175,530 A
  • Filed: 05/21/1990
  • Issued: 12/29/1992
  • Est. Priority Date: 05/21/1990
  • Status: Expired due to Fees
First Claim
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1. A flow detection apparatus for detecting fluid flow through a select pipe, said fluid flow generating a sound wave having a frequency within a frequency range, comprising:

  • a first and a second sound transducer positioned along the select pipe, said transducers generating respective first and second output signals in response to detected sounds, said output signals being at a phased relationship for sounds attributable to fluid flow through said select pipe; and

    means for discriminating the sounds attributable to fluid flow through said select pipe from other sources of sound based upon said phased relationship and said frequency.

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