| http://www.w3.org/ns/prov#value | - A fiber optic sensor for measuring refractive index of a surrounding medium, comprising:a fiber optic core; a thin film metal clad of metal or metal oxide or other metal compound or alloy formed on and surrounding the fiber optic core, the metal clad having an effective thickness and light transmissivity which in combination with the surrounding medium produces a localized refractive index and a c
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