WMS based dual-range real-time trace sensor for ethane detection in exhaled breath

Li, Guolin; Wu, Yunhui; Zhang, Zecheng; Zhang, Xuena; Ma, Kun; Jiao, Yue; Li, Jiarui; Liu, Yajing; Song, Yimeng; Zhao, Hao; Zhai, Shenqiang; Li, Qiang

doi:10.1016/j.optlaseng.2022.107222

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…Thus, laser absorption spectroscopy was used to obtain an absolute number density of involved atmospheric molecules and byproducts. Wavelength modulation spectroscopy was adopted to monitor the concentration change of the trace by‐produces 23,24 . The key spectral characteristics related to these molecules are summarized in Table 1 30…”

Section: Methodsmentioning

confidence: 99%

“…Wavelength modulation spectroscopy was adopted to monitor the concentration change of the trace by-produces. 23,24 The key spectral characteristics related to these molecules are summarized in Table 1. 30 3 | RESULTS…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Toxic trace molecules like HCN can accumulate to detectable levels in a static plasma reactor over an extended period of time. High-sensitivity techniques such as wavelength modulation absorption spectroscopy 23,24 and photoacoustic spectroscopy [25][26][27][28][29] help measure trace gas concentrations efficiently.…”

Section: Introductionmentioning

confidence: 99%

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Advancing CO₂ to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

Wang,

Deng,

Huang

et al. 2024

Micro & Optical Tech Letters

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Capturing carbon dioxide (CO2) and transforming it into valuable fuels offers a dual benefit: the potential to reduce atmospheric CO2 levels and decrease our dependency on fossil fuels. Plasma‐assisted CO2 to carbon monoxide (CO) conversion stands out within the various CO2 recycling methods, with research primarily emphasizing its energy efficiency and conversion efficacy. However, investigations of CO2 conversion under real air conditions are relatively scarce, and the effects of the other atmospheric molecules on the CO2 conversion process require further exploration. We have induced plasma chemical reactions by generating ultrashort pulse laser filaments inside a sealed‐off cavity with variable air pressures. Simultaneously, we applied mid‐infrared laser absorption spectroscopy to monitor the time evolution of the reaction products. The peak CO2‐to‐CO conversion ratio was achieved at an air pressure of 8000 Pa, which resulted in a CO concentration of 82 ppm. The experimental results suggested that nitrogen (N2) plays a promoting role in CO2‐to‐CO conversion, while the presence of oxygen (O2) seems to hinder the process. The hydroxyl radical (OH) arising from water molecules (H2O) limits the accumulation of CO at lower air pressures. However, at higher air pressures, the reduced OH radical concentration shows negligible impact on the CO2‐to‐CO conversion ratios. In addition, the study revealed that atmospheric plasmas produce a high concentration of hydrogen cyanide (HCN), which is directly proportional to the levels of ambient humidity. This research contributes to the development of strategies to mitigate the production of harmful gases like HCN in CO2 conversion, thereby promoting the ecofriendly conversion of atmospheric CO2.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

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Advancing CO₂ to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

Wang,

Deng,

Huang

et al. 2024

Micro & Optical Tech Letters

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“…Wavelength modulated spectroscopy (WMS) techniques using tunable diode laser absorption spectroscopy (TDLAS) have been used to measure ethane concentrations in exhaled gases by scanning ethane non-absorption lines at 2986.7 cm -1 and 2988.2 cm -1 , allowing high sensitivity detection in both ethane concentration ranges. A highly sensitive mid-infrared dual range real-time trace sensor has been developed for the detection of ethane in exhaled gases, where the sensor employs an interband cascade laser (ICL) in continuous wave (CW) mode with an effective optical absorption length of 76.3 m in a multi-channel gas cell (MPGC) 23 – 27 . A compact near-infrared (NIR) laser-based detection system for trace methane (CH4) has been investigated by J.M.…”

Section: Introductionmentioning

confidence: 99%

A multiline fitting method for measuring ethylene concentration based on WMS-2f/1f

Wang,

Yang,

Liu

et al. 2023

Sci Rep

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Coal spontaneous combustion risk assessment is a global technical challenge for the sustainable development of deep mining technology, and C2H4 is a key indicator for early warning of coal spontaneous combustion. Tunable diode laser absorption spectroscopy (TDLAS) has the advantages of high selectivity, high sensitivity, high accuracy and real-time on-line measurement, and it can detect multiple gases simultaneously, so it has significant advantages in the accurate detection of coal spontaneous combustion indicator gases. To address the problem of cross-interference between the near-infrared absorption lines of CH4 and C2H4, which are the indicator gases of spontaneous combustion in coal, a multi-line fitting method was proposed in this study to calibrate the concentration of C2H4. The high-precision Environics2000 automatic standard gas dispenser from the United States, which has a built-in CPU computer control and data control and processing system, was used. Its gas concentration accuracy: ± 1.0%, gas flow accuracy: ± 1.0%, gas repeatability accuracy: ± 1.0%, flow linearity accuracy: ± 0.5%, and inlet operating pressure: minimum 10 psig (0.67 bar) ~ 75 psig (5.04 bar). The measured and simulated WMS-2f/1f signals were multilinearly fitted using a multilinear fitting algorithm and wavelength modulation spectroscopy (WMS), and the measurement of C2H4 concentration was achieved based on the extracted spectral line information. The results show that the maximum relative error of C2H4 concentration measurement is 2.40%, which is 54% lower than that of the conventional 2f peak measurement method, thus demonstrating the effectiveness of the multilinear fitting algorithm in the inversion of C2H4 concentration under the interference of absorption lines. In addition, this study has far-reaching implications for the application of TDLAS technology in the accurate detection of coal spontaneous combustion indicator gases.

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An improved residual oxygen detection method by using axis-sectional multi-reflection within optical-length-limited pharmaceutical vials

Wang,

Zhao,

Luo

et al. 2023

Measurement

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WMS based dual-range real-time trace sensor for ethane detection in exhaled breath

Cited by 11 publications

References 22 publications

Advancing CO₂ to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

Advancing CO₂ to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

A multiline fitting method for measuring ethylene concentration based on WMS-2f/1f

An improved residual oxygen detection method by using axis-sectional multi-reflection within optical-length-limited pharmaceutical vials

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WMS based dual-range real-time trace sensor for ethane detection in exhaled breath

Cited by 11 publications

References 22 publications

Advancing CO2 to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

Advancing CO2 to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

A multiline fitting method for measuring ethylene concentration based on WMS-2f/1f

An improved residual oxygen detection method by using axis-sectional multi-reflection within optical-length-limited pharmaceutical vials

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Product

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Advancing CO₂ to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor

Advancing CO₂ to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor