Development of in-fiber measurement methods for the analysis of chemical components and reactions
Abstract
Optical fibers have been developed as a tool for data transmission. Their ability to transport light over long distances with minimal loss is important for this. On-going advancements in this technology have enabled the production of optical fibers with capillaries that extend along the longitudinal axis through the entire fiber. These capillaries are typically filled with air, but can also be filled with other gases or even liquids. The fluids within the optical fiber can hereby interact with the light propagating through the capillaries. Because the light can be guided over a very long distance in the very narrow core of the fiber, a fluid-filled fiber represents an ideal platform for any type of light-fluid interaction. The focus of this work is on investigating various chemical systems within an optical fiber and developing fiber-based measurement methods. Three different systems were investigated for this purpose. First, an acid-catalyzed esterification was observed using Raman spectroscopy. For this, the components involved were initially measured as pure substances, and their Raman spectra were analyzed for possible differences. Based on these differences, a calibration curve was created, which was then used to observe the conversion curve of an actual reaction. Subsequently, temperature and concentration variations were performed to determine the reaction parameters. Good agreement with the values reported in the literature was observed. Secondly, a system exhibiting…
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