University of Illinois Urbana-Champaign

Spectroscopic Detection Of Methane At A Ppt Sensitivity Level In Mid-ir With A Long-path Multipass Cell

Schuessler, Hans A

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5658.pdf
RF10_5658.pdf

Permalink

https://hdl.handle.net/2142/111469

Description

Title
Spectroscopic Detection Of Methane At A Ppt Sensitivity Level In Mid-ir With A Long-path Multipass Cell
Author(s)
Schuessler, Hans A
Contributor(s)
  • Kolomenskii, Alexandre
  • Bounds, James R
  • Rodriguez, Carlos
  • Xia, Jinbao
Issue Date
2021-06-24
Keyword(s)
Spectroscopy as an analytical tool
Date of Ingest
  • 2021-09-24T21:09:50Z
  • 2022-01-21T16:09:23Z
Abstract
Highly sensitive detection of methane is important for biomedical applications, environmental monitoring, and the detection of leaks in the gas and oil industry. An ultra-high sensitivity sensor employing a mid-IR (MIR) interband cascade laser (center wavelength of 3.37 micron) and a multi-pass cell (MPC) was developed for methane detection. The ultra-high sensitivity is achieved due to the high absorbance in the MIR, a long interaction path length, and the implementation of a wavelet denoising processing algorithm. The long interaction path of 580 m was achieved with a confocal MCP and the distance between the mirrors of 1 m. The performance of the sensor was tested in two measuring modes: direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS). For the sensor working in the DAS measurement mode the optimal set of sub-wavelet functions was determined and utilized for denoising and the minimum of the Allan deviation of the sensor of 3 ppb was achieved with an averaging time of 200 s. For the WMS measuring mode the sensor detection limit for methane of 560 ppt with 290 s averaging time was determined from the Allan deviation analysis. The developed sensor is suitable for a compact and portable design and has broad applicability in the high-sensitivity measurements of methane and other trace gases. This work was supported by the Robert A Welch Foundation, grant No A1546 and the T3 grant from Texas A and M University and Open Fund of State Key Laboratory of Applied Optics (SKLA02020001A12). [1] Jinbao Xia et al. A sensitive methane sensor of a ppt detection level using a mid-infrared interband cascade laser and a long-path multipass cell, Sensors and Actuators B: Chemical, 334, 129641 (2021). [2] Jinbao Xia: State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences Changchun, 130033, China
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
Text
Genre of Resource
Conference Paper / Presentation
Language
eng
Permalink
http://hdl.handle.net/2142/111469
DOI
10.15278/isms.2021.RF10

Owning Collections

Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy PRIMARY