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Method and apparatus for liquid content detection with refractive index and temperature signal mixing

  • US 5,157,452 A
  • Filed: 07/01/1991
  • Issued: 10/20/1992
  • Est. Priority Date: 07/03/1990
  • Status: Expired due to Term
First Claim
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1. A liquid content detecting apparatus for detecting the content of a liquid component contained in a mixed liquid, said apparatus comprising:

  • a refractive index sensor for sensing the refractive index of a liquid component in the mixed liquid and generating a corresponding refractive index signal;

    a temperature sensor for sensing the temperature of the mixed liquid and generating a corresponding temperature signal;

    a signal mixer coupled to the refractive index sensor and the temperature sensor for mixing the refractive index signal and the temperature signal with each other to generate a single mixed signal; and

    a liquid content calculator coupled to the signal mixer for calculating the content of the liquid component based on the single mixed signal.

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