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Title: Methods of improving spatial resolution for IR spectroscopy in atmospheric-pressure plasma systems

Abstract

High-temperature, atmospheric pressure plasma systems operated in molecular gases present complex diagnostic challenges. Infrared spectroscopy has been used to make measurements of the absorbance spectrum of complex molecular gas mixtures and thereby calculate the concentrations and species temperatures in these systems. For atmospheric-pressure systems, high spatial gradients arise and high spatial-resolution measurements are thus desirable. Some systems have achieved increased spatial resolution by reducing the beam diameter. However, this increase in spatial resolution comes at the expense of the optical throughput. Here we propose modifying a commercial Fourier Transform, Infrared spectrometer system with a set of simple optical elements. This design allows for scannable, high spatial resolution absorbance spectrum measurements of a complex molecular gas mix. We analyze the signal-to-noise ratio for this design and compare it with the diameter reduction method. For sufficiently low plasma radiation levels, this design improves the signal-to-noise ratio relative to reducing the beam diameter size while transmitting nearly all of the beam power. Furthermore, whether this design can achieve the desired sub-mm spatial resolution depends on the radiating area of the infrared light source in the spectrometer.

Authors:
ORCiD logo [1];  [1]
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  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1484718
Alternate Identifier(s):
OSTI ID: 1479132
Grant/Contract Number:  
AC02-09CH11466; R071
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FTIR; Spatial Resolution; Plasma torch; Plasma Spectroscopy

Citation Formats

McGreivy, Nick, and Jaworski, M. A. Methods of improving spatial resolution for IR spectroscopy in atmospheric-pressure plasma systems. United States: N. p., 2018. Web. doi:10.1063/1.5039389.
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McGreivy, Nick, & Jaworski, M. A. Methods of improving spatial resolution for IR spectroscopy in atmospheric-pressure plasma systems. United States. https://doi.org/10.1063/1.5039389
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McGreivy, Nick, and Jaworski, M. A. Thu . "Methods of improving spatial resolution for IR spectroscopy in atmospheric-pressure plasma systems". United States. https://doi.org/10.1063/1.5039389. https://www.osti.gov/servlets/purl/1484718.
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@article{osti_1484718,
title = {Methods of improving spatial resolution for IR spectroscopy in atmospheric-pressure plasma systems},
author = {McGreivy, Nick and Jaworski, M. A.},
abstractNote = {High-temperature, atmospheric pressure plasma systems operated in molecular gases present complex diagnostic challenges. Infrared spectroscopy has been used to make measurements of the absorbance spectrum of complex molecular gas mixtures and thereby calculate the concentrations and species temperatures in these systems. For atmospheric-pressure systems, high spatial gradients arise and high spatial-resolution measurements are thus desirable. Some systems have achieved increased spatial resolution by reducing the beam diameter. However, this increase in spatial resolution comes at the expense of the optical throughput. Here we propose modifying a commercial Fourier Transform, Infrared spectrometer system with a set of simple optical elements. This design allows for scannable, high spatial resolution absorbance spectrum measurements of a complex molecular gas mix. We analyze the signal-to-noise ratio for this design and compare it with the diameter reduction method. For sufficiently low plasma radiation levels, this design improves the signal-to-noise ratio relative to reducing the beam diameter size while transmitting nearly all of the beam power. Furthermore, whether this design can achieve the desired sub-mm spatial resolution depends on the radiating area of the infrared light source in the spectrometer.},
doi = {10.1063/1.5039389},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Thu Oct 25 00:00:00 EDT 2018},
month = {Thu Oct 25 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5039389
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Figures / Tables:

FIG. 1 FIG. 1: Schematic of an FTIR spectrometer.
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    TABLE I (p. 4)table
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