APPARATUS AND METHOD FOR CREATING A STABLE OPTICAL INTERFACE
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Accused Products
Abstract
A system and a method for creating a stable and reproducible interface of an optical sensor system for measuring blood glucose levels in biological tissue include a dual wedge prism sensor attached to a disposable optic that comprises a focusing lens and an optical window. The disposable optic adheres to the skin to allow a patient to take multiple readings or scans at the same location. The disposable optic includes a Petzval surface placed flush against the skin to maintain the focal point of the optical beam on the surface of the skin. Additionally, the integrity of the sensor signal is maximized by varying the rotation rates of the dual wedge prisms over time in relation to the depth scan rate of the sensor. Optimally, a medium may be injected between the disposable and the skin to match the respective refractive indices and optimize the signal collection of the sensor.
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Citations
10 Claims
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1. (canceled)
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2. A method for resolving variations in an optical path length of an optical sensor system having at least one angled mirror for measuring blood analyte levels in biological tissue, the method comprising:
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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 angled mirror and into the biological tissue, and the at least one angled mirror 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. - View Dependent Claims (3, 4, 5)
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6. A system configured to resolve variations in an optical path length of an optical sensor system having at least one angled mirror for measuring blood analyte levels in biological tissue, the system comprising:
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a computer readable storage medium having program instructions embodied therewith; and one or more processors configured to execute the program instructions to cause the system to; receive a plurality of scans from 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 angled mirror and into the biological tissue, and the at least one angled mirror 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; locate 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; locate respective first peaks in two or more subsequent scans of the plurality of scans; normalize, in depth, the respective first peaks in the two or more subsequent scans 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; average 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. - View Dependent Claims (7, 8, 9, 10)
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Specification