Relation between plasma velocity and power spectrum density in atmospheric-pressure plasma plume

Yambe, Kiyoyuki; Masuda, Seiya

doi:10.1063/1.4963392

Cited by 11 publications

(1 citation statement)

References 25 publications

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“…5,6 A quartz tube is used as the dielectric, and the plasma is released into the atmosphere. A plasma jet has a small bullet-like volume that travels at unusually high velocity, [7][8][9][10] but the estimated drift velocity of its ions is almost zero. 11 The plasma jet is seen as the continuous movement of the plasma bullet.…”

Section: Introductionmentioning

confidence: 99%

Excitation Wavelength and Temperature at Irradiation of Metal by Atmospheric-Pressure Nonequilibrium Argon Plasma

Yambe

Abe

2018

Plasma Med

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We studied excitation wavelength and temperature during irradiation of atmospheric-pressure nonequilibrium argon plasma to pure metal plate. We observed excitation emission of light activated by argon plasma in the same wavelength region, both with and without metal plate. The wavelength region activated by atmospheric-pressure nonequilibrium argon plasma was limited. In the presence of the ion corresponding to wavelength region activated by argon plasma, corresponding ions were activated. Both oxygen ions and metal ions are generated by plasma irradiation, but during each observed wavelength, the wavelength of metal ion activated by argon plasma was dominant, because excitation energy of oxygen ion is greater than that of each metal ion. Heat propagation from argon plasma to metal plate occurs by plasma irradiation. Consequently, heat propagation from argon plasma to copper plate is greater in comparison to cases with other metal plates. This is due to the high thermal conductivity of copper. In the case of atmospheric-pressure nonequilibrium plasma, plasma is affected by interaction with an object, because plasma energy is smaller, and temperature of nonequilibrium plasma changes via with thermal conductivity of the object.

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Section: Introductionmentioning

confidence: 99%

Excitation Wavelength and Temperature at Irradiation of Metal by Atmospheric-Pressure Nonequilibrium Argon Plasma

Yambe

Abe

2018

Plasma Med

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Estimation of excitation temperature by duty ratio of observed period in non-equilibrium plasma

et al. 2017

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We investigated the excitation temperature of atmospheric-pressure non-equilibrium (cold) plasma using a line-pair method. An atmospheric cold plasma was intermittently generated using a quartz tube, a rare gas, and a foil electrode by applying high-voltage alternating current. Because the plasma occurred intermittently, an interval appeared between each generated plasma bullet. We assessed the time-averaged effective intensity from the observed intensity at each wavelength measured using a spectrometer. When the exposure time of the spectrometer is longer than the observed period of the plasma emission light, the time-averaged effective intensity at each wavelength decreases because it includes the interval with no plasma emission light. The difference in intensity between wavelengths changes with frequency, because changing the frequency changes the interval between plasma bullets. Consequently, even if the plasma electron temperature does not depend on the frequency of the applied voltage, the excitation temperature estimated from the difference in intensity changes with the frequency. The plasma electron temperature can be estimated from the duty ratio of the observed period of plasma emission light, and we estimated the electron temperature in the helium and argon cold plasmas to be 1.0 eV.

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Dependence of plasma current on object condition in atmospheric pressure non-thermal equilibrium argon plasma

2019

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The dependence of the plasma plume current on the object condition is investigated by atmospheric pressure non-thermal equilibrium argon plasma. When processing with plasma, the flow of plasma current changes depending on the condition of the object. In the case of metal object with grounded condition, the plasma current was independent of the surface area and electrical conductivity of the metal object. While, in the case of metal object with floating condition, the plasma current was dependent on the surface area of the metal object, but not on the electrical conductivity of the metal object. When an object is grounded, the closed circuit is fixed with plasma, object, and ground-line, and then the current flow follows Ohm’s law. Because the ground-line is longer than the plasma plume length and the scale length of the object, the plasma current is independent of the characteristics of the metal object. When the object is in a floating condition, the divergence of the charge stored in the object to the atmosphere depends on the surface area of the object because it follows Gauss’s law.

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Relation between plasma velocity and power spectrum density in atmospheric-pressure plasma plume

Cited by 11 publications

References 25 publications

Excitation Wavelength and Temperature at Irradiation of Metal by Atmospheric-Pressure Nonequilibrium Argon Plasma

Excitation Wavelength and Temperature at Irradiation of Metal by Atmospheric-Pressure Nonequilibrium Argon Plasma

Estimation of excitation temperature by duty ratio of observed period in non-equilibrium plasma

Dependence of plasma current on object condition in atmospheric pressure non-thermal equilibrium argon plasma

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