Investigation of helium plasma temperature in atmospheric-pressure plasma plume using line pair method

Yambe, Kiyoyuki; Satou, Sou

doi:10.1063/1.4942170

Cited by 22 publications

(7 citation statements)

References 24 publications

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“…In comparison with the other He emission lines in the 200–900 nm wavelength range, 706 nm has the smallest excitation energy [ 41,42 ] ; thus, intense emission occurs. [ 42,43 ] The other helium atomic lines noticed are 587.6 nm (3 3 D → 2 3 P), 667.8 nm (3 1 D → 2 1 P), and 728.1 nm (3 1 S → 2 1 P). A helium atom naturally has two metastable levels, which are 2 1 S 0 (singlet) and 2 3 S 1 (triplet), with energies of 19.8 and 20.6 eV, respectively.…”

Section: Resultsmentioning

confidence: 96%

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Mahreen

Prakash

Kar

et al. 2022

Contributions to Plasma Physics

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This work investigates the influence of pulse modulation frequency ranging from 50 Hz–10 kHz on the helium RF atmospheric pressure plasma jet's fundamental characteristics. The impact of modulation frequency on plasma jet discharge behaviour, geometrical variation, reactive species emission, and plasma parameters (gas temperature Tg, electron excitation temperature Texc, and electron density (ne)) are studied using various diagnostics such as optical imaging, emission spectra, and thermal diagnostic. From the experiments, it is observed that operating the plasma jet at low pulse modulation frequencies (around 50 Hz) provides enhanced plasma dimensions, higher electron densities and greater optical emission from reactive species (viz., He I, O, OH, N2+, etc.) as compared to the higher modulation frequencies. Besides the low power consumption, three times less gas temperature of the modulated plasma jet than the continuous wave mode makes it more advantageous for the applications. Moreover, the influence of duty cycle (D) and applied RF power (P) on the plasma jet characteristics are also discussed. It is found that 10–40% duty cycle operation provides the most favourable attributes. More importantly, the concern of shorter plasma length in RF plasma jets is overcome by operating at 10–20% duty cycle with increased applied power. This work thoroughly characterizes helium atmospheric pressure RF plasma jet with a wide range of pulse mode operating parameters, which could help to select appropriate operating conditions for various industrial and biomedical applications.

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Section: Resultsmentioning

confidence: 96%

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Mahreen

Prakash

Kar

et al. 2022

Contributions to Plasma Physics

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“…In our simulated model of a candle flame, the highest temperature is around 2,400 K, which makes the physics of molten region very significant for oxygen sensing. Here, various species collide with air molecules to form the emission spectra (Yambe and Satou (2016)). Thus, comparing and evaluating the molten region before and after the dielectric discharge with respect to the line pair method (Griem (2005)) can be useful for measuring a particular constituent in the system.…”

Section: Plasma For Oxygen Sensingmentioning

confidence: 99%

Towards Real-Time Oxygen Sensing: From Nanomaterials to Plasma

Vinitha

Chinmaya

CV³

et al. 2022

Front. Sens.

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A significantly large scope is available for the scientific and engineering developments of high-throughput ultra-high sensitive oxygen sensors. We give a perspective of oxygen sensing for two physical states of matters—solid-state nanomaterials and plasma. From single-molecule experiments to material selection, we reviewed various aspects of sensing, such as capacitance, photophysics, electron mobility, response time, and a yearly progress. Towards miniaturization, we have highlighted the benefit of lab-on-chip-based devices and showed exemplary measurements of fast real-time oxygen sensing. From the physical–chemistry perspective, plasma holds a strong potential in the application of oxygen sensing. We investigated the current state-of-the-art of electron density, temperature, and design issues of plasma systems. We also show numerical aspects of a low-cost approach towards developing plasma-based oxygen sensor from household candle flame. In this perspective, we give an opinion about a diverse range of scientific insight together, identify the short comings, and open the path for new physical–chemistry device developments of oxygen sensor along with providing a guideline for innovators in oxygen sensing.

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“…In our simulated model of a candle flame, the highest temperature is around 2400 K, which makes the physics of molten region very significant for oxygen sensing. Here, various species collide with air molecules to form the emission spectra 76 . Thus, comparing and evaluating the molten region before and after the dielectric discharge with respect to the line pair method 77 ) can be useful for measuring a particular constituent in the system.…”

Section: Plasma For Oxygen Sensingmentioning

confidence: 99%

Towards real-time oxygen sensing: From nanomaterials to plasma

Vinitha¹,

Chinmaya²,

CV³

et al. 2021

Preprint

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A significantly large scope is available for the scientific and engineering developments of high-throughput ultra-high sensitive oxygen sensors. We give a perspective of oxygen sensing for two physical states of matters -solid-state nanomaterials and plasma. From single-molecule experiments to material selection, we reviewed various aspects of sensing, such as capacitance, photophysics, electron mobility, response time, and a yearly progress. Towards miniaturisation, we have highlighted the benefit of lab-on-chip-based devices and showed exemplary measurements of fast real-time oxygen sensing. From the physicalchemistry perspective, plasma holds a strong potential in the application of oxygen sensing. We investigated the current state-of-the-art of electron density, temperature, and design issues of plasma systems. We also show a numerical aspects of low-cost approach towards developing plasma-based oxygen sensor from household candle flame. In this perspective, we give an opinion about a diverse range of scientific insight together, identifies the short comings, and opens the path for new physical-chemistry device developments of oxygen sensor along with providing a guideline for innovators in oxygen sensing.

show abstract

Investigation of helium plasma temperature in atmospheric-pressure plasma plume using line pair method

Cited by 22 publications

References 24 publications

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Influence of pulse modulation frequency on helium RF atmospheric pressure plasma jet characteristics

Towards Real-Time Oxygen Sensing: From Nanomaterials to Plasma

Towards real-time oxygen sensing: From nanomaterials to plasma

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