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US 2009/0021743 A1Published application
Coaxial Diffuse Reflectance Read Head
AssigneeBayer HealthCare LLC
InventorAndrew J. Dosmann
Life of this patent
Estimating the term…
Abstract
Improved performance in reflectance photometry is obtained by employing an optical fiber to direct collimated light to a test area and to return both diffuse and specular light from the test area. Specular light is prevented from reaching a light detector by a spatial filter, while diffuse light is collected and measured.
Claims27
A coaxial diffuse reflectance read head comprising:
- (a) a collimated light source;
- (b) a beam splitter adapted to receive collimated light from said collimated light source and adapted to direct a portion of said collimated light to an optical fiber;
- (c) an optical fiber adapt to direct said collimated light received from said beam splitter at one end of said optical fiber to a test area at a second end of said optical fiber and adapted to direct specular and diffuse light returned from said test area to said beam splitter, said optical fiber being either in contact with said test area or closely approaching said test area;
- and
- (d) a spatial filter adapted to receive said specular light from said beam splitter and to block access of said specular light to a light detector.
2 more elements
A method of measuring an analyte in a biological sample the method comprising the acts of:
- (a) providing collimated light from a light source;
- (b) directing said collimated light with a beam splitter into a first end of an optical fiber, a second end of said optical fiber being in contact with a test area or closely approaching said test area;
- (c) directing diffuse and specular light returned from said test area via said optical fiber to said beam splitter, said specular reflected light passing through said beam splitter and contacting a spatial filter, thereby preventing said specular light from being detected, said diffuse reflected light passing around said spatial filter and contacting a light detector;
- and
- (d) measuring the diffuse reflected light with said light detector and correlating the measured diffuse reflected light with the amount of an analyte in said biological sample.
2 more elements
Dependencies are inferred from the claim text.