Chemistry strip reader and method
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United States of America Patent
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Apr 3, 2012
Grant Date -
Oct 30, 2008
app pub date -
Apr 17, 2008
filing date -
Apr 18, 2007
priority date (Note) -
Expired
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Abstract
A chemistry strip reader and method for analyzing chemistry strips. A conveyor moves chemical strips through different imaging positions at discrete points in time across the field of view of a camera, which captures images of each chemistry strip at different discrete times. A processor determines reflectance values for each of the chemical strips from the captured images at the discrete points in time. Calibration targets adjacent the chemistry strips can be used to adjust the determined reflectance values. The light source can sequentially illuminate each chemistry strip with three different wavelengths of light, where the processor calculates a concentration determination associated with the chemistry strip by calculating different chromaticity coordinates for the different wavelengths of light, and comparing them to known chromaticity coordinates for known analyte concentrations.
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