Dynamic terahertz spectroscopy of gas molecules mixed with unwanted aerosol under atmospheric pressure using fibre-based asynchronous-optical-sampling terahertz time-domain spectroscopy
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Terahertz (THz) spectroscopy is a promising method for analysing polar gas molecules mixed with unwanted aerosols due to its ability to obtain spectral fingerprints of rotational transition and immunity to aerosol scattering. In this article, dynamic THz spectroscopy of acetonitrile (CH 3 CN) gas was performed in the presence of smoke under the atmospheric pressure using a fibre-based, asynchronous-optical-sampling THz time-domain spectrometer. To match THz spectral signatures of gas molecules at atmospheric pressure, the spectral resolution was optimized to 1 GHz with a measurement rate of 1 Hz. The spectral overlapping of closely packed absorption lines significantly boosted the detection limit to 200 ppm when considering all the spectral contributions of the numerous absorption lines from 0.2 THz to 1 THz. Temporal changes of the CH 3 CN gas concentration were monitored under the smoky condition at the atmospheric pressure during volatilization of CH 3 CN droplets and the following diffusion of the volatilized CH 3 CN gas without the influence of scattering or absorption by the smoke. This system will be a powerful tool for real-time monitoring of target gases in practical applications of gas analysis in the atmospheric pressure, such as combustion processes or fire accident.
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The use of ASOPS has expanded the target of THz-TDS to substances with narrow spectral lines, such as gas molecules.
“The use of ASOPS has expanded the target of THz-TDS to substances with narrow spectral lines, such as gas molecules [2-4].”
From Jitter correction for asynchronous optical sampling terahertz spectroscopy using free-running pulsed lasers (2023) · cites this paper as [4]
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Gas sensing using terahertz time-domain spectroscopy
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Khani, M. E., & Arbab, M. H. (2022) · Sensors · doi:10.3390/s22062305 · Cited by 22 · see citing works
Nakagawa, M., Kanda, N., Otsu, T., Ito, I., Kobayashi, Y., & Matsunaga, R. (2023) · Optics Express · doi:10.1364/oe.488866 · Cited by 3 · see citing works
- Authors
- Hsieh, Y.-D., Nakamura, S., Abdelsalam, D. G., Minamikawa, T., Mizutani, Y., Yamamoto, H., Iwata, T., Hindle, F., & Yasui, T.
- Affiliations
- Japan Science and Technology Agency (JP)
- Tokushima University (JP)
- Utsunomiya University (JP)
- Université du littoral côte d'opale (FR)
- Corresponding author
- Yasui, Takeshi
- Venue
- Scientific Reports
- Published
- 2016-06-15
- Volume
- 6
- Issue
- 1
- Pages
- 28114-28114
- ISSN
- 2045-2322 (ISSN-L)
- PMC
- PMC4908425
- OpenAlex
- W2423037644
- Cited by
- 60
- References
- 1
- Citations by year
- 2026: 4 · 2025: 3 · 2024: 3 · 2023: 3 · 2022: 12 · 2021: 8 · 2020: 4 · 2019: 6 · 2018: 8 · 2017: 6 · 2016: 3
- FWCI
- 3.53
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Scientific Reports (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Institutional Repositories DataBase (IRDB) (publishedVersion, cc-by)
- Funders
- Canon Foundation in Europe
- Japan Society for the Promotion of Science (26246031)
- Japan Science and Technology Agency (26246031)
- Collaborative Research Based on Industrial Demand
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Chemistry › Spectroscopy › Spectroscopy and Laser Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Keywords
- terahertz spectroscopy, acetonitrile, smoke, aerosol interference, asynchronous optical sampling, rotational transitions, detection limit, real-time gas monitoring, combustion monitoring
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