Optical waveguide sensor system
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United States of America Patent
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Jan 16, 2007
Grant Date -
Dec 2, 2004
app pub date -
Sep 3, 2002
filing date -
Sep 5, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The sensor system for the detection of chemical substances has a spiral optical waveguide which produces an evanescent field penetrating into the adjacent medium, a light source for coupling light into the waveguide, and a detecting circuit for receiving light from the waveguide and producing an output signal reflecting the sensed chemical substance. The waveguide has the form of a bifilar, non-crossing spiral. It consists of an incoming or decreasing spiral segment and an outgoing or increasing spiral segment continuously bound by a central semi-circular segment.
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