Time resolved optical emission images of an atmospheric pressure plasma jet with transparent electrodes

Puаč, Nevena; Maletic, Dejan; Lazović, Saša; Malović, Gordana; Đorđević, Ana; Petrović, Zoran Lj.

doi:10.1063/1.4735156

Cited by 57 publications

(36 citation statements)

References 24 publications

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“…The reported velocities for ionization waves vary in a wide range of 5·10 3 m/s to 4·10 5 m/s [2,[32][33][34][35][36][37][38][39] which covers the velocities obtained in the present study. Most of the published velocities of the ionization waves have been determined outside of the dielectric tube.…”

Section: Propagation Velocity Of Ionization Wavessupporting

confidence: 83%

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Talviste

Jõgi

Raud

et al. 2016

Contrib. Plasma Phys.

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Present study investigated the development of ionization waves in an atmospheric-pressure plasma jet. Plasma was ignited by 6 kHz sinusoidal voltage applied to a cylindrical electrode surrounding the 500 μm inner diameter quartz tube and positioned 10 mm upstream from the tube orifice. The plasma current was observed using a plane electrode placed 20 mm downstream from the tube orifice. The spatial development of ionization waves was monitored by registering the optical emission along the axis of the tube. At voltages in range of 5.5 -7.5 kV only one pulse occurred during positive half-period while at higher voltages the number of pulses increased up to 6 -7 per half-period. The development of the first and subsequent pulses during one half-period was essentially different. For the first pulse the sharp rise of optical emission characterizing the front of the ionization wave occurred initially near the high-voltage electrode and moved towards the tube orifice and further in the He jet. The propagation of ionization wave coincided with the rise of the displacement current measured at the plane electrode. For subsequent ionization waves of the same half-period, the emission occurred initially at the tube orifice and the ionization wave developed simultaneously in two directions: towards the high-voltage electrode and towards the end of the jet. The velocity of ionization wave inside the tube was in range of (2. 5 -5.0)·10 4 m/s for first wave and as high as 1.2·10 5 m/s for subsequent waves.

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Section: Propagation Velocity Of Ionization Wavessupporting

confidence: 83%

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Talviste

Jõgi

Raud

et al. 2016

Contrib. Plasma Phys.

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“…Another explanation for the fluctuating results in the region 0–20 mm is the theory about plasma “bullets” which compose the plasma jet discharge. As it has been observed in many studies, the propagation mechanism of a plasma “bullet” is complicated, but one of conclusions is that the shape and distribution of the electron density, the electric field and the excited species inside such a bullet is non‐homogeneous and is even found to vary depending on tube size.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric Pressure Plasma Penetration inside Flexible Polymeric Tubes

Onyshchenko

Nikiforov

Morent

2015

Plasma Process. Polym.

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An atmospheric argon plasma jet has been used to explore the plasma penetration inside tubes of small diameter and the plasma treatment effect on the inner tube surface. The goal of this paper is to show how the tube size can influence the plasma jet penetration and the resulting surface effects on polyethylene tubes with diameters varying between 0.28 mm and 3.00 mm. Optical emission spectroscopy and light emission images have been used to investigate the distribution of active species along the tube length. To examine the plasma treatment effect on the inner tube surface, capillary action, water contact angle measurements and XPS analysis have been used. The results presented in this paper will clearly demonstrate the great potential of atmospheric pressure plasma jets for inner tube surface modification.

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“…In addition, it would be interesting to expand the measurements to RF breakdown and thus test the existing theories [31]. Finally, one could also pay closer attention to the Townsend regime where absolute calibration may provide data to model heavy particle effects at high E/N [32] or provide data on ionization coefficients [12] and kinetics of nonlocal discharges [33] and runaway electrons [34], even data required to study streamers and ionization fronts [35]. …”

Section: Resultsmentioning

confidence: 99%

Breakdown and discharge regimes in standard and micrometer size dc discharges

Škoro¹

2012

J. Phys.: Conf. Ser.

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Breakdown and discharge regimes in standard and micrometer size dc discharges Abstract. In this paper, an overview of our recent experimental studies of the breakdown and operation of non-equilibrium discharges in centimetre and micrometer size geometries is presented. In the centimetre size geometries, we focused on elementary processes and phenomenology in gases used for some of the currently most attractive applications of low temperature plasmas -fluorocarbon gases (CF 4 , CHClF 2 ) and water vapour. Measurements were performed at electrode separation d = 1.1 cm, in a pressure range from 0.1 to 5 Torr. In the case of micro-discharges, the emphasis was on testing the validity of standard scaling laws and proper determination of scaling parameters pd and j/p 2 . This was done at electrode gaps of 200 and 500 μm and pressures of 50 and 20 Torr in argon. The investigation is based on measurements of breakdown potentials (Paschen curves) and Volt-Ampere characteristics, supported by simultaneous ICCD imaging of the discharges. IntroductionOwing to many unique properties, low temperature non-equilibrium discharges have been used in a large number of applications. Fundamental investigations lead to new applications but, recently, in many cases, the needs of applications led to numerous fundamental results. On all accounts, the complexity of these discharges call for full understanding of discharge processes in order to make efficient and reliable devices. Moreover, along with numerous non-equilibrium discharge sources in centimetre size [1,2], many sources with micrometre characteristic dimensions have been introduced recently [3,4]. Hence, an ongoing direction of research about discharges in molecular gases and gas mixtures of interest for applications [5] has been appended with new challenges of discharges taking place between electrodes separated by few tens or hundreds of micrometers -micro-discharges [6]. Additionally, a new type of non-equilibrium discharges taking place in or near liquids has emerged [7], bringing new possibilities for applications together with a whole new set of issues to resolve.Accordingly, results presented in this paper are divided in two sections. The first one deals with measurements conducted with cm-size chamber. Using previously gathered experience on standard size non-equilibrium discharges in rare gases at low pressures [8][9][10][11][12], our research is continued with experimental measurements in gases of interest for applications: fluorocarbons (CF 4 and CHClF 2 ) which are widely used for plasma etching (e.g. [13]) and water vapour that is present as working environment of numerous commercial devices [14]. Measurements in these gases aim to provide reliable and systematic data sets required for plasma models that may be extended to applications involving those gases.

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Time resolved optical emission images of an atmospheric pressure plasma jet with transparent electrodes

Cited by 57 publications

References 24 publications

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Development of Ionization waves in an Atmospheric‐Pressure Micro‐Plasma Jet

Atmospheric Pressure Plasma Penetration inside Flexible Polymeric Tubes

Breakdown and discharge regimes in standard and micrometer size dc discharges

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