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Reflectometer

  • US 6,574,425 B1
  • Filed: 10/30/1998
  • Issued: 06/03/2003
  • Est. Priority Date: 10/31/1997
  • Status: Expired due to Fees
First Claim
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1. A reflectometer, comprising:

  • a modulated light source for emitting light to illuminate a target surface which possesses a certain color and shade of color;

    an optical detector for detecting light that is reflected from the target surface and generating a first output indicative of detected light;

    means for processing the first output to generate a feedback signal for application to the optical detector to compensate for any shift in the first output resulting from the detection of ambient light by the optical detector, and differentially amplify the first output to generate a second output; and

    a detector for synchronously demodulating the second output to generate a substantially steady DC output voltage that is indicative of the color or shade of color at the target surface.

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