Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 16, 2007
Patent Application Number
10488171
Date Filed
September 3, 2002
Patent Primary Examiner
Patent 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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