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Effects of the electrical excitation signal parameters on the geometry of an argon-based non-thermal atmospheric pressure plasma jet.

Benabbas MT, Sahli S, Benhamouda A, Rebiai S - Nanoscale Res Lett (2014)

Bottom Line: The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values.The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases.This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space.

View Article: PubMed Central - PubMed

Affiliation: Microsystems and Instrumentation Laboratory, Department of Electronics, Faculty of Sciences of Technology, University of Constantine 1, 25017, Constantine, Algeria, m.t.benabbas@gmail.com.

ABSTRACT
A non-thermal atmospheric pressure argon plasma jet for medical applications has been generated using a high-voltage pulse generator and a homemade dielectric barrier discharge (DBD) reactor with a cylindrical configuration. A plasma jet of about 6 cm of length has been created in argon gas at atmospheric pressure with an applied peak to peak voltage and a frequency of 10 kV and 50 kHz, respectively. The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values. The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases. For an applied voltage of 10 kV, the plasma jet diameter decreases from near 5 mm for a frequency of 10 kHz to less than 1 mm at a frequency of 50 kHz. This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space. PACS 2008: 52.50.Dg; 52.70.-m; 52.80.-s.

No MeSH data available.


Plasma jet length variation versus the applied peak to peak voltage at different signal frequencies (a, b).
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Fig4: Plasma jet length variation versus the applied peak to peak voltage at different signal frequencies (a, b).

Mentions: The effect of the applied voltage intensity on the plasma jet length is represented in Figure 4. For frequencies above 10 kHz and below 50 kHz (Figure 4b), two regions were observed: the first one between 6.6 and 8 kV where the plasma jet length increases slightly and the second one (beyond 8 kV) where the plasma jet length increases more promptly. The presence of a threshold-like voltage around 8 kV may be linked to a default in the matching network between the plasma generator and the impedance constituted by the created plasma jet and the plasma reactor[11, 12]. The electrical power transmitted to the plasma jet is more important when the matching network is well realized in the electrical system. In this case, after reaching the voltage value inducing the electrical breakdown of the argon gas, more energy is transferred into the discharge area. When the applied voltage increases, more energetic species are created and their pronounced energy allows them to penetrate deeper into the surrounding air, leading to the formation of an extended plasma jet. When the matching network is not well realized, the transferred energy is at its low level compared to the previous point. The created species are then less energetic and cannot penetrate into the surrounding air, leading to the creation of a shorter plasma jet.Figure 4


Effects of the electrical excitation signal parameters on the geometry of an argon-based non-thermal atmospheric pressure plasma jet.

Benabbas MT, Sahli S, Benhamouda A, Rebiai S - Nanoscale Res Lett (2014)

Plasma jet length variation versus the applied peak to peak voltage at different signal frequencies (a, b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494020&req=5

Fig4: Plasma jet length variation versus the applied peak to peak voltage at different signal frequencies (a, b).
Mentions: The effect of the applied voltage intensity on the plasma jet length is represented in Figure 4. For frequencies above 10 kHz and below 50 kHz (Figure 4b), two regions were observed: the first one between 6.6 and 8 kV where the plasma jet length increases slightly and the second one (beyond 8 kV) where the plasma jet length increases more promptly. The presence of a threshold-like voltage around 8 kV may be linked to a default in the matching network between the plasma generator and the impedance constituted by the created plasma jet and the plasma reactor[11, 12]. The electrical power transmitted to the plasma jet is more important when the matching network is well realized in the electrical system. In this case, after reaching the voltage value inducing the electrical breakdown of the argon gas, more energy is transferred into the discharge area. When the applied voltage increases, more energetic species are created and their pronounced energy allows them to penetrate deeper into the surrounding air, leading to the formation of an extended plasma jet. When the matching network is not well realized, the transferred energy is at its low level compared to the previous point. The created species are then less energetic and cannot penetrate into the surrounding air, leading to the creation of a shorter plasma jet.Figure 4

Bottom Line: The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values.The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases.This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space.

View Article: PubMed Central - PubMed

Affiliation: Microsystems and Instrumentation Laboratory, Department of Electronics, Faculty of Sciences of Technology, University of Constantine 1, 25017, Constantine, Algeria, m.t.benabbas@gmail.com.

ABSTRACT
A non-thermal atmospheric pressure argon plasma jet for medical applications has been generated using a high-voltage pulse generator and a homemade dielectric barrier discharge (DBD) reactor with a cylindrical configuration. A plasma jet of about 6 cm of length has been created in argon gas at atmospheric pressure with an applied peak to peak voltage and a frequency of 10 kV and 50 kHz, respectively. The length and the shape of the created plasma jet were found to be strongly dependent on the electrode setup and the applied voltage and the signal frequency values. The length of the plasma jet increases when the applied voltage and/or its frequency increase, while the diameter at its end is significantly reduced when the applied signal frequency increases. For an applied voltage of 10 kV, the plasma jet diameter decreases from near 5 mm for a frequency of 10 kHz to less than 1 mm at a frequency of 50 kHz. This obtained size of the plasma jet diameter is very useful when the medical treatment must be processed in a reduced space. PACS 2008: 52.50.Dg; 52.70.-m; 52.80.-s.

No MeSH data available.