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Readhead for reflectance measurement of distant samples

  • US 5,028,139 A
  • Filed: 07/16/1987
  • Issued: 07/02/1991
  • Est. Priority Date: 07/16/1987
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring reflected light which comprises a light source, means separated at varying distances from such apparatus for supporting a specimen having a surface the reflectance of which is to be measured upon exposure to light emitted from said light source, and means for detecting light reflected from the surface of the specimen, means for passing light rays through and along a transmission path and through at least one light trap to illuminate the specimen and to measure nonspecular reflected light passed from the specimen through said light trap wherein said light source impinges on said sample in essentially collimated rays whose divergence is 8°

  • or less and wherein the field of view of the means for detecting light is larger than the illuminated area of said specimen.

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