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SIMPLE SUGAR CONCENTRATION SENSOR AND METHOD

  • US 20140104596A1
  • Filed: 07/24/2013
  • Published: 04/17/2014
  • Est. Priority Date: 10/16/2012
  • Status: Active Grant
First Claim
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1. An apparatus for measuring change in sugar concentration in a fluid relative to a baseline concentration, the apparatus comprising:

  • a source of optical energy, said source having an emitter with an emission pattern;

    a first optical detector spaced a distance from said source;

    a second optical detector collocated with said first optical detector;

    a plurality of polarizers optically between said source and said detectors, said plurality of polarizers comprising;

    a first polarizer intersecting the emission pattern; and

    a second polarizer rotated relative to the first polarizer by a first rotational amount Θ

    , spaced a distance from the first polarizer, and proximal to said second optical detector, wherein said first polarizer is optically between said source and said second polarizer;

    a volume of liquid, said volume intersecting said emission pattern and positioned optically between said first polarizer and said second polarizer and optically between said first polarizer and said first detector;

    andat least one circuit coupled to said first optical detector and said second optical detector,said at least one circuit comprising;

    a compensating circuit coupled to said second optical detector;

    a subtractor circuit coupled to said compensating circuit and said first optical detector; and

    a gain circuit coupled to said subtractor circuit.

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