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.
227 Citations
14 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 wedge prism 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; locating a first peak in a first scan of the plurality of scans; locating a first peak in each subsequent scan of the plurality of scans; normalizing each first peak in each subsequent scan against the first peak in the first scan; and averaging the normalized scans to produce a resulting averaged scan. - View Dependent Claims (3)
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4. 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:
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determining a threshold trigger; and setting the optical sensor system to begin acquiring data once the threshold trigger is reached. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for stabilizing a scan pattern of an optical sensor system having at least one wedge prism for measuring blood analyte levels in biological tissue, the method comprising:
setting an angular velocity of the at least one wedge prism to a value based on a depth scan rate associated with the optical sensor system. - View Dependent Claims (11, 12, 13, 14)
Specification