Liquid phase supercontinuum fiber-loop cavity enhanced absorption spectroscopy for H2O in organics

Li, Mingyun

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https://hdl.handle.net/2142/97080 Copy

Description

Title

Liquid phase supercontinuum fiber-loop cavity enhanced absorption spectroscopy for H2O in organics

Author(s)

Li, Mingyun

Contributor(s)

Lehmann, Kevin

Issue Date

2017-06-22

Keyword(s)

Instrument/technique demonstration

Abstract

Last year we presented a way of liquid phase sensing for H$_{2}$O and D$_{2}$O samples using a side-polished-fiber (SPF) sensor. It is a setup to combine the advantages of Supercontinuum light source with fiber-loop sensing method to make liquid phase CEAS sensing easier and more reliable. After some calculation we found out that with a SPF sensor we could only make use of less than 0.2% of the light from Supercontinuum source, so we decided to make changes on sensors in order to make more light usable. Instead of a SPF or similar evanescent wave sensors, if the light can be guided through a sample directly in free space, we can get almost 100% of the light to be used. So we replaced our sensor by using a mirror and two fibers placed vertical to it side-by-side. The mirror reflects light from one fiber to the other. The free space coupling can make the most of our Supercontinuum source, and a much stronger signal is observed so far. We are now able to use our setup to monitor very low H$_{2}$O concentrations such as saturated H$_{2}$O solution in organics like CCl$_{4}$. Hopefully we can make our system more reliable in the future to make it use in more samples and lower concentrations.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/97080

DOI

https://doi.org/10.15278/isms.2017.RI09

Copyright and License Information

Copyright 2017 Mingyun Li

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