Title :
Experimental Investigation of Long-Period Grating Transition Modes to Monitor CO2 in High-Pressure Aqueous Solutions
Author :
Melo, Luis ; Burton, Geoff ; Warwick, Stephen ; Wild, Peter M.
Author_Institution :
Dept. of Mech. Eng., Univ. of Victoria, Victoria, BC, Canada
Abstract :
An experimental investigation of transition modes of long-period gratings (LPG) is reported. Coating LPGs with a material of high refractive index causes a reorganization of the cladding modes, leading to a substantial increase in sensitivity to changes in the surrounding refractive index (SRI). The sensitivity of a coated LPG to SRI over a given range of SRI is a function of coating thickness. In this study, the thickness of polystyrene coatings applied by dip coating was measured by scanning electron microscopy. The LPG sensors were used to monitor dissolution of liquid CO2 in deionized water at high pressure, simulating use of the sensors to monitor geologically sequestered CO2 in a deep aquifer.
Keywords :
antireflection coatings; carbon capture and storage; carbon compounds; diffraction gratings; dip coating; dissolving; fibre optic sensors; groundwater; optical fibre cladding; optical fibre fabrication; optical polymers; refractive index; scanning electron microscopy; CO2; LPG coating; LPG sensors; SRI; cladding mode reorganization; coated LPG sensitivity; deep aquifer; deionized water; dip coating; geologically sequestered CO2; high-pressure aqueous solutions; liquid CO2 dissolution; long-period grating transition modes; polystyrene coating thickness; scanning electron microscopy; surrounding refractive index; Attenuation; Coatings; Monitoring; Optical fiber sensors; Optical fibers; Sensitivity; Carbon dioxide; Long period grating,; carbon dioxide; long period grating; sensor; transition mode;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2383356
