Moisture sensor based on evanescent wave light scattering by...

Coating processes – Optical element produced – Polarizer – windshield – optical fiber – projection screen – or...

Reexamination Certificate

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C427S163100, C427S299000, C427S314000, C427S398100

Reexamination Certificate

active

07037554

ABSTRACT:
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.

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