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Rate measurement analyzer

  • US 4,309,112 A
  • Filed: 08/18/1980
  • Issued: 01/05/1982
  • Est. Priority Date: 05/15/1979
  • Status: Expired due to Term
First Claim
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1. A system for measuring an unknown amount of a selected chemical substance in a biological first fluid comprising:

  • means for measuring the optical density of a fluid during a rate reaction;

    means for providing a voltage proportional to the optical density of a fluid during its rate reaction;

    means responsive to said proportional voltage for providing a difference voltage;

    means for measuring a period of time equal to the time required for the difference voltage of a second fluid to increase from one level to a selected higher level during a rate reaction; and

    means for displaying a difference voltage representative of a change in the optical density of said first fluid at the conclusion of the period of time required for the difference voltage of the second fluid to increase from one level to a selected higher level.

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