Optical detection system using electromagnetic radiation to detect presence or quantity of analyte
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United States of America Patent
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Sep 14, 2010
Grant Date -
Nov 3, 2005
app pub date -
Dec 22, 2004
filing date -
Apr 30, 2004
priority date (Note) -
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Abstract
A system that employs transmission-based detection techniques to determine the presence or concentration of an analyte within a test sample is provided. Specifically, the optical detection system contains a chromatographic-based assay device that is positioned in the electromagnetic radiation path defined between an illumination source and detector. To enhance the sensitivity and signal-to-noise ratio of the system without significantly increasing costs, the distance between the illumination source and/or detector and the assay device is minimized. The illumination source and/or detector may also be positioned directly adjacent to the assay device. In addition, the system may be selectively controlled to reduce reliance on external optical components, such as optical filters or diffusers.
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