Apparatus for and methods of sensing evanescent events in a fluid field
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United States of America Patent
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Jul 5, 2005
Grant Date -
Mar 25, 2004
app pub date -
Sep 22, 2003
filing date -
Sep 18, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An evanescent filed based sensor uses a detector for sensing variations in properties of a fluid flowing in a boundary layer adjacent to the detector. The detector comprises an optical waveguide in the form of an optical fiber having a core layer covered by a cladding layer and having a substantially D-shaped cross section defining a planar surface with an optical grating pattern thereon. When a beam of laser light is directed through the detector as an input, variations in an output of the beam of laser light are indicative of changes in fluid pressure or density in the boundary layer or immediate region adjacent to the grating of the optical waveguide.
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