Spectroscopic analysis of samples in aqueous environments using a hollow core fiber




Adike, Akshara

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This thesis details the procedure and the results of Raman spectroscopy obtained for graded concentrations of aqueous samples passing through the core of a stand alone hollow core fiber(HCF). Also, spectroscopic analysis of these samples is performed in a HCF coupler fabricated using silica core(SCF) single mode fiber. The SCF-HCF coupler is fabricated using the principle of evanescent wave coupling, enabling the periodic transfer of light between SCF and HCF. With the SCF-HCF coupler, the core of the HCF can be filled with aqueous samples which leads to the change of the light signal propagating through the SCF as a result of the interaction of light with the sample at the coupling region. The study conducted a detailed literature review which led to measuring the back reflections in contrast to the measurement of the forward propagating light upon it's interaction with the sample. After a series of experiments using varying concentrations of samples such as Ytterbium Oxide(Yb2O3) suspension, Double Walled Carbon Nanotubes(DWCNT) suspension, aqueous H2S, aqueous H2S in DWCNT suspension, it is found that the change in the concentrations of each sample can be identied by measuring the back reflections of the SCF-HCF coupler and the results are repetitive.



hydrogen sulfide, carbon nanotubes, waste water treatment, optical coupling