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Color measurement instrument with modulated illumination

  • US 6,888,633 B2
  • Filed: 05/16/2002
  • Issued: 05/03/2005
  • Est. Priority Date: 05/16/2001
  • Status: Expired due to Term
First Claim
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1. A method for measuring optical properties of a sample comprising:

  • illuminating the sample including driving a plurality of light sources each having a unique spectral energy distribution and each modulated at a continuous frequency, said illuminating step further including providing servo control of each light source;

    detecting composite light including modulated sample light reflected by the sample from the modulated light sources; and

    filtering the composite light to separate the sample light at each of the continuous modulated frequencies from the composite light.

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