Patent ID: 9574950
Date: 2017-02-21
CPC Classifications: G01K,G01L,G02B

Claim:
1. An optical fiber sensor for use in an environment rich in a selected gas, comprising: an enclosure; an optical fiber having a lead end that is mounted within the enclosure, so as to extend across the enclosure interior; and a sensor array, comprising a plurality of gratings written into the lead end of a twin-core optical fiber, wherein the gratings are configured to receive a light input and to provide respective individual outputs having wavelengths that vary in response to respective changes in temperature, gas diffusion, and strain, wherein changes in temperature, strain, and gas diffusion are derivable from the respective individual outputs of the gratings in sensor array, and wherein each of the plurality of gratings is configured to have equal wavelength shifts in response to gas diffusion within the fiber segment, such that gas diffusion parameters are excludable when deriving changes in temperature, strain, and gas diffusion, whereby measurements are obtainable at varying levels of gas diffusion.