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Drop detection method and apparatus

  • US 5,415,641 A
  • Filed: 11/02/1992
  • Issued: 05/16/1995
  • Est. Priority Date: 04/01/1991
  • Status: Expired due to Term
First Claim
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1. A drop flow detector comprising:

  • a drop chamber;

    a light source for passing light through said chamber;

    a light detector responsive to said light after it has passed through said chamber for producing an electrical detector output signal related thereto; and

    ,circuit means, responsive to said detector output signal, for determining the existence of drop flow, including;

    means for detecting the slope of voltage changes in said detector output signal;

    means for determining that the slope detected by said means for detecting exceeds a threshold value; and

    ,means, responsive to a determination by said means for determining that the slope detected by said means for detecting exceeds said threshold value, for generating a control signal.

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