High-Sensitivity In-Situ Diagnosis of NO 2 Production and Removal in DBD Using Cavity Ring-Down Spectroscopy

WU Xingwei(吴兴伟); LI Cong(李聪); ZHANG Chenfei(张辰飞); DING Hongbin(丁洪斌)

doi:10.1088/1009-0630/16/2/10

Plasma Science and Technology > 2014 > 16(2): 142-148. > DOI: 10.1088/1009-0630/16/2/10

WU Xingwei(吴兴伟), LI Cong(李聪), ZHANG Chenfei(张辰飞), DING Hongbin(丁洪斌). High-Sensitivity In-Situ Diagnosis of NO 2 Production and Removal in DBD Using Cavity Ring-Down Spectroscopy[J]. Plasma Science and Technology, 2014, 16(2): 142-148. DOI: 10.1088/1009-0630/16/2/10

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High-Sensitivity In-Situ Diagnosis of NO 2 Production and Removal in DBD Using Cavity Ring-Down Spectroscopy

Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics and Optical Electronic Technology, Dalian University of Technology, Dalian 116024, China

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (No.2013GB109005), National Natural Science Foundation of China (Nos.11175035, 10875023), Chinesisch-Deutsches Forschungs Project (GZ768), the Fundamental Research Funds for the Central Universities (DUT12ZD(G)01) and Mmlab Research Project of China (DP1051208)

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Received Date: August 20, 2013

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Abstract

Abstract

A highly-sensitive in-situ diagnosis approach for nitrogen dioxide (NO ₂ ) has been developed in dielectric barrier discharge (DBD) based on pulsed cavity ring-down spectroscopy (CRDS). Absorption bands of NO₂ in a spectral region from 508 nm to 509 nm were used, and a detection limit of 17.5 ppb was achieved. At this level of sensitivity, the quantitative and real-time monitoring of the production and removal of NO ₂ are accomplished for the first time in the discharge region. By measuring the removal amount and rate at different NO ₂ initial number densities from 1.54 × 10 ¹³ cm ⁻³ to 2.79 × 10 ¹⁴ cm⁻³, we determined the relationship between them and NO ₂ initial number densities. The removal amount linearly increases with the initial number density, while the removal rate increases logarithmically. At a lower initial number density, the removal rate is limited. By considering the chemical kinetic mechanism in plasma, a qualitative explanation for the above phenomena is proposed: the additional NO₂ produced by discharge limits the removal rate, since the NO ₂ concentration is dominated by the competition between the forward reactions (production) and the reverse reactions (removal).
- DBD,
- CRDS,
- NO ₂ production,
- NO ₂ removal

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References (31)

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