High sensitivity absorption spectroscopy in glow discharge plasmas

1993 ◽  
Vol 64 (1) ◽  
pp. 45-48 ◽  
Author(s):  
R. C. Wamsley ◽  
K. Mitsuhashi ◽  
J. E. Lawler
Keyword(s):  
Glow Discharge ◽  
Absorption Spectroscopy ◽  
High Sensitivity ◽  
Discharge Plasmas

Self-Adjusting Characterization for Steady-State, Direct Current Cathode-Dominated Glow Discharge Plasmas at High Pressures

2013 ◽  
Vol 30 (8) ◽  
pp. 085201 ◽  
Author(s):  
Fang Ding ◽  
Shi-Jian Zheng ◽  
Bo Ke ◽  
Zhong-Liang Tang ◽  
Yi-Chuan Zhang ◽  
...  
Keyword(s):  
Steady State ◽  
Glow Discharge ◽  
Direct Current ◽  
High Pressures ◽  
Discharge Plasmas

In-situ quantification of NO synthesis in a warm air glow discharge by WMS-based Mid-IR QCL absorption spectroscopy

2022 ◽  
Author(s):  
Chuanqi Wang ◽  
Junjie Qiao ◽  
Yijia Song ◽  
Qi Yang ◽  
Dazhi Wang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Glow Discharge ◽  
Absorption Spectroscopy ◽  
Energy Cost ◽  
High Energy ◽  
Cathode Region ◽  
Synthesis Rate ◽  
No Production ◽  
Airflow Rate

Abstract Nitric oxide (NO) is one of the most crucial products in the plasma-based nitrogen fixation process. In this work, in-situ measurements were performed for quantifying the NO synthesis spatially in a warm air glow discharge, through the method of Mid-infrared quantum cascade laser absorption spectroscopy (QCL-AS). Two ro-vibrational transitions at 1900.076 cm-1 and 1900.517 cm-1 of the ground-state NO(X) were probed sensitively by the help of the wavelength modulation spectroscopy (WMS) approach to increase the signal/noise (S/N) level. The results show a decline trend of NO synthesis rate along the discharge channel from the cathode to the anode. However, from the point of energy efficiency, the cathode region is of significantly low energy efficiency of NO production. Severe disproportionality was found for the high energy consumption but low NO production in the region of cathode area, compared to that in the positive column zone. Further analysis demonstrates the high energy cost of NO production in the cathode region, is ascribed to the extremely high reduced electric field E/N therein not selectively preferable for the processes of vibrational excitation or dissociation of N2 and O2 molecules. This drags down the overall energy efficiency of NO synthesis by this typical warm air glow discharge, particularly for the ones with short electrode gaps. Limitations of further improving the energy cost of NO synthesis by variations of the discharge operation conditions, such as discharge current or airflow rate, imply other effective manners able to tune the energy delivery selectively to the NO formation process, are sorely needed.

Prospective Applications of Low Frequency Glow Discharge Plasmas on Enhanced Germination, Growth and Yield of Wheat

2017 ◽  
Vol 38 (1) ◽  
pp. 13-28 ◽  
Author(s):  
N. C. Roy ◽  
M. M. Hasan ◽  
M. R. Talukder ◽  
M. D. Hossain ◽  
A. N. Chowdhury
Keyword(s):  
Glow Discharge ◽  
Low Frequency ◽  
Growth And Yield ◽  
Discharge Plasmas
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