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Apparatus and method for determining the concentration in a sample

  • US 4,199,260 A
  • Filed: 08/21/1978
  • Issued: 04/22/1980
  • Est. Priority Date: 08/21/1978
  • Status: Expired due to Term
First Claim
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1. A method of determining the concentration of a constituent of a sample within a fluid carrier passing along a medium, the effective index of refraction of said medium being changed due to passage of said carrier therethrough, comprising the steps of:

  • (a) obtaining an optical measurement of light that is passed through said medium containing said sample; and

    (b) compensating said optical measurement by substantially nullifying effects due to a change in said effective index of refraction of said medium due to passage of said fluid carrier therethrough which results from said fluid.

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