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Apparatus and method for creating a stable optical interface

  • US 9,924,893 B2
  • Filed: 08/04/2014
  • Issued: 03/27/2018
  • Est. Priority Date: 03/17/2006
  • Status: Active Grant
First Claim
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1. A method for resolving variations in an optical path length of an optical sensor system having at least one wedge prism for measuring blood analyte levels in biological tissue, the method comprising:

  • taking a plurality of scans using the optical sensor system, wherein;

    the plurality of scans comprise depth scans into the biological tissue,the plurality of scans are obtained via transmission of light through the at least one wedge prism and into the biological tissue, andthe at least one wedge prism is oriented differently for at least some of the plurality of scans creating variations in the optical path length for at least some of the plurality of scans;

    locating a first peak in a first scan of the plurality of scans, wherein the first peak is indicative of a physical interface between an optical window of the optical sensor system and a surface of the biological tissue;

    locating first peaks in each subsequent scan of the plurality of scans;

    normalizing, in depth, each first peak in each subsequent scan against the first peak in the first scan such that the plurality of scans are aligned in depth and variations in the optical path length are removed;

    averaging the normalized scans to produce a resulting averaged scan and remove speckle associated with the optical sensor system; and

    measuring blood analyte levels based on the resulting averaged scan.

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