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Method and apparatus for the optical measurement of fluid flow

  • US 4,707,130 A
  • Filed: 12/21/1984
  • Issued: 11/17/1987
  • Est. Priority Date: 12/24/1983
  • Status: Expired due to Fees
First Claim
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1. A method for optically measuring the cyclic flow of a fluid containing stray particles comprising sensing the time the particles spend in transit through a test section between two light beams one of which is a fixed start beam and the other of which is a stop beam which rotates in oscillatory fashion in discrete angular steps around said fixed start beam as a center, dividing the flow cycle into a plurality of sections with respective measuring windows through which respective start and stop beams can pass, sensing the transit times and distribution of particles at each window by determining the sum of the particles passing the start beam as well as the sum of the particles subsequently passing the stop beam, and correlating the determined sums of the particles respectively passing the start and stop beams at each window to relate the same by electronic evaluation circuitry and provide indication of cyclic flow through the test section.

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