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Color sensor

  • US 4,699,510 A
  • Filed: 11/07/1984
  • Issued: 10/13/1987
  • Est. Priority Date: 11/07/1984
  • Status: Expired due to Term
First Claim
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1. In a color sensor of the type having at least one light detector for detecting the light reflected or emitted by a sample containing a fluorescent agent (FA), the improvement comprising:

  • a first source of light positioned to illuminate the sample;

    a second source of light positioned to illuminate the sample wherein at least a portion of the light emitted by the second source is in the excitation band of the FA;

    means for modulating the intensity of the second source independently of the first in a plurality of first and second phases wherein in each first phase the sample is illuminated by both the first and second sources and in each second phase any level of illumination of the sample by the second source differs from the level of illumination provided by the second source in the first phases; and

    means for measuring the energy received from the object in phase synchronism with the independent modulation of the second source.

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