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Fiber-based Stray Light Suppression in Spectrometers

Gong, Miaoxin LU (2017) FYSK02 20171
Department of Physics
Combustion Physics
Abstract
Stray light is known as strong interference in spectroscopic measurements. With the creation of a novel kind of customized fibers, manufactured by the fiber optics group in Jena, Germany, a general experimental solution to this problem is possible. This thesis work is mainly aiming at testing and demonstrating how these fibers work for stray light suppression and their efficiency in measuring different types of optical signals. It is here demonstrated that the method is capable of stray-light suppression to more than one order of magnitude in Raman spectroscopy. In addition, studies of emission from Argon atoms show that the fiber is a good solution for suppression of background and high-frequency noises, which is reduced by more than a... (More)
Stray light is known as strong interference in spectroscopic measurements. With the creation of a novel kind of customized fibers, manufactured by the fiber optics group in Jena, Germany, a general experimental solution to this problem is possible. This thesis work is mainly aiming at testing and demonstrating how these fibers work for stray light suppression and their efficiency in measuring different types of optical signals. It is here demonstrated that the method is capable of stray-light suppression to more than one order of magnitude in Raman spectroscopy. In addition, studies of emission from Argon atoms show that the fiber is a good solution for suppression of background and high-frequency noises, which is reduced by more than a factor of 3 and 5, respectively. The results show that the method is feasible and efficient in practical use and that it has potential as a further tool in spectroscopy. (Less)
Popular Abstract
Since the history of spectroscopy began with Isaac Newton's optics experiments, it has been beneficial to most research fields in natural science to study the interaction between matter and electromagnetic radiation. However, spectroscopy suffers from interferences called stray light. Stray light in an optical system can be described as light that deviates from the intended path and ends up in wrong places. In spectrometers, stray photons will distort the spectral characteristics of the detector. Therefore stray light can be a notable problem in spectroscopy, in particular when the spectral component of the signal-of-interest is near a strong spectral peak. The elimination or correction of stray light is desired in spectroscopic... (More)
Since the history of spectroscopy began with Isaac Newton's optics experiments, it has been beneficial to most research fields in natural science to study the interaction between matter and electromagnetic radiation. However, spectroscopy suffers from interferences called stray light. Stray light in an optical system can be described as light that deviates from the intended path and ends up in wrong places. In spectrometers, stray photons will distort the spectral characteristics of the detector. Therefore stray light can be a notable problem in spectroscopy, in particular when the spectral component of the signal-of-interest is near a strong spectral peak. The elimination or correction of stray light is desired in spectroscopic experiments.

A solution to this problem was developed in 2014 at the Division of Combustion Physics at Lund University. One potential development of this method could be to use special designed fibers. Such fibers were manufactured by Hatmut Bartelt's group in Jena, Germany, which is an active group in fiber-related research. This thesis work, which is done in collaboration with the fiber optics group, aims at testing and demonstrating how these fibers work for stray-light suppression and how well they can be applied in measuring different type of optical signals. (Less)
Please use this url to cite or link to this publication:
author
Gong, Miaoxin LU
supervisor
organization
course
FYSK02 20171
year
type
M2 - Bachelor Degree
subject
keywords
spectroscopy, spectrometer, stray light, fiber optics, Periodic Shadowing, lock-in analysis, Raman spectroscopy
language
English
id
8912938
date added to LUP
2017-06-09 12:48:09
date last changed
2017-06-09 12:48:09
@misc{8912938,
  abstract     = {Stray light is known as strong interference in spectroscopic measurements. With the creation of a novel kind of customized fibers, manufactured by the fiber optics group in Jena, Germany, a general experimental solution to this problem is possible. This thesis work is mainly aiming at testing and demonstrating how these fibers work for stray light suppression and their efficiency in measuring different types of optical signals. It is here demonstrated that the method is capable of stray-light suppression to more than one order of magnitude in Raman spectroscopy. In addition, studies of emission from Argon atoms show that the fiber is a good solution for suppression of background and high-frequency noises, which is reduced by more than a factor of 3 and 5, respectively. The results show that the method is feasible and efficient in practical use and that it has potential as a further tool in spectroscopy.},
  author       = {Gong, Miaoxin},
  keyword      = {spectroscopy,spectrometer,stray light,fiber optics,Periodic Shadowing,lock-in analysis,Raman spectroscopy},
  language     = {eng},
  note         = {Student Paper},
  title        = {Fiber-based Stray Light Suppression in Spectrometers},
  year         = {2017},
}