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Diffused light reflectance readhead

  • US 5,518,689 A
  • Filed: 09/05/1995
  • Issued: 05/21/1996
  • Est. Priority Date: 09/05/1995
  • Status: Expired due to Fees
First Claim
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1. A diffused light reflectance readhead for detecting diffuse light reflected off of a reagent test pad reacted with an analyte, comprising:

  • illuminating means, having a beam axis, for illuminating said reagent test pad;

    supporting means for supporting said reagent test pad in a temporarily fixed position with respect to said beam axis;

    an exit aperture positioned adjacent said illuminating means;

    a staircase optical baffle positioned only on the side of said exit aperture nearest said illuminating means, said baffle rejecting stray light and passing desirable diffuse reflected light from said reagent test pad through said aperture; and

    a light sensor positioned to receive said diffuse reflected light and capable of converting said received light into corresponding electrical signals; and

    interpretation means for interpreting said corresponding electrical signals to detect the presence of said analyte.

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