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PARTICLE FLOW MONITOR

  • US 3,842,791 A
  • Filed: 07/03/1972
  • Issued: 10/22/1974
  • Est. Priority Date: 05/14/1970
  • Status: Expired due to Term
First Claim
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1. An apparatus for sensing particles in a flowing fluid comprising:

  • first means having a passage for carrying fluid;

    second means having a second passage for carrying fluid;

    connecting means joining the first means with the second means, said connecting means comprising a housing having an inside wall surrounding a chamber open to the first passage and a second passage whereby fluid and particles flow through said chamber, said housing having an inlet opening in communication with the first passage and an open end opposite the inlet opening, said inside wall of the housing tapers outwardly whereby the chamber increases in size as a function of distance from the inlet opening into the chamber, particle sensing means located across the open end of said chamber opposite the inlet opening for producinG audio signals related to the amount of particles which hit the sensing means, said sensing means comprising a member having at least one enclosed cell, a first particle impaction surface located adjacent one side of and facing the chamber whereby said first surface does not interfere with the flow of fluid and particles through said chamber, a portion of said particles flowing through said chamber hit said first particle impaction surface producing the audio signals, and a second surface located outside the chamber, said enclosed cell being located between said first surface and said second surface.

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