| http://www.w3.org/ns/prov#value | - A method of detecting the refractive index of a medium, comprising:providing a fiber optic sensor comprising a fiber optic core and 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 a surrounding medium produces a localized re
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