Terahertz-wave absorption gas sensing for dimethyl sulfoxide
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Authors
Passarelli, Alec
Issue Date
2022-05
Type
Electronic thesis
Thesis
Thesis
Language
en_US
Keywords
Mechanical engineering
Alternative Title
Abstract
Rotational absorption spectroscopy for dimethyl sulfoxide (DMSO) is characterized in the
220-330 GHz frequency range using a robust electronic THz-wave spectrometer, for the
development of THz gas sensing for this compound of commercial relevance. DMSO is a common
solvent used in many food, pharmaceutical, and manufacturing applications, and can present
danger to human health and the work environment; hence, remote gas sensors for DMSO
environmental and process monitoring are desired. Absorption measurements were carried out for
pure DMSO at 297 K and 0.4 Torr. DMSO was shown to have a unique rotational fingerprint with
series of repeating absorption features. The frequencies of transitions observed in the present study
are found to be in good agreement with prior experimental work and spectral simulations based on
rotational parameters. The sensor developed here exhibits a detection limit of 1.3-2.6 x 1015 DMSO
molecules/cm3 per meter of absorption pathlength, with the potential for greater sensitivity with
signal-to-noise improvements. The study illustrates the potential of all electronic THz-wave
systems for miniaturized remote gas sensors
Description
May 2022
School of Engineering
School of Engineering
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY