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Colorimeter instrument with fiber optic ring illuminator

  • US 4,464,054 A
  • Filed: 05/27/1982
  • Issued: 08/07/1984
  • Est. Priority Date: 05/27/1982
  • Status: Expired due to Term
First Claim
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1. A color sensing system comprising means defining a measurement plane adapted to receive at said measurement plane a test surface for purposes of making a color measurement, a source of light, a fiber optic cable having one end positioned to receive a beam of light directly from said source and the other end positioned to transimit light to said measurement plane, the ends of the optic fibers in said other end of said fiber optic cable being formed into and uniformly distributed in an annulus with the ends of said fibers pointed toward said test surface plane and inclined toward the axis of said annulus, at least one photodetector, and means to receive light diffusely reflected from said measurement plane and transmit the light to said photodetector.

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