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Moisture sensor based on evanescent wave light scattering by porous sol-gel silica coating

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
An optical fiber moisture sensor that can be used to sense moisture present in gas phase in a wide range of concentrations is provided, as well techniques for making the same. The present invention includes a method that utilizes the light scattering phenomenon which occurs in a porous sol-gel silica by coating an optical fiber core with such silica. Thus, a porous sol-gel silica polymer coated on an optical fiber core forms the transducer of an optical fiber moisture sensor according to an embodiment. The resulting optical fiber sensor of the present invention can be used in various applications, including to sense moisture content in indoor/outdoor air, soil, concrete, and low/high temperature gas streams.
Tao, Shiquan (Starkville, MS), Singh, Jagdish P. (Starkville, MS), Winstead, Christopher B. (Hattiesburg, MS)
10/ 608,228
June 30, 2003
[0001] This invention was made with Government support under DE-FC26-98FT40395 awarded by the U.S. Department of Energy. The Government may have certain rights in the invention.