Spectroscopic Characterization of a Pulsed Low-Current High-Voltage Discharge Operated at Atmospheric Pressure

Szulc, M.; Förster, Günter; Marqués-López, José-Luis; Schein, J.

doi:10.3390/app12136366

Cited by 3 publications

(1 citation statement)

References 66 publications

(133 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The input of the pulse-delay generator DG645 from Stanford Research Systems, Sunnyvale, CA, USA, was set to block the incoming trigger The setup depicted in Figure 3 is operated in sampling mode, with the laser pulse and camera triggered at maximum amplitude of the current pulse. To synchronize the laser pulse frequency with the operating frequency of the power supply, a slightly modified triggering circuit from [45] was used. The input of the pulse-delay generator DG645 from Stanford Research Systems, Sunnyvale, CA, USA, was set to block the incoming trigger edges for a period of 100 ms, thus ensuring the required laser pulse frequency of 10 Hz.…”

Section: Methodsmentioning

confidence: 99%

A Simple and Compact Laser Scattering Setup for Characterization of a Pulsed Low-Current Discharge

et al. 2022

Self Cite

View full text Add to dashboard Cite

Recent research trends show an increasing interest in non-equilibrium plasmas operated at atmospheric pressure, which are often used to tackle several environmental and health issues. Nevertheless, due to the complexity of the applications, these trends also show the need for a comprehensive characterization of such plasmas for a deeper understanding of the observed effects. One of the diagnostic methods for experimental determination of key parameters which affect the reactivity of a plasma, i.e., electron temperature, electron density and heavy particle temperature, is laser scattering. In this work, an approach based on a simple and compact laser scattering setup is proposed, which allows an estimation of the above parameters without any additional changes in the acquisition settings. Thus, the experimental effort and possible sources of error can be reduced. The proposed setup is tested experimentally with a commercially available pulsed plasma system, and the results are compared to available data. From this comparison, it is found that the plasma parameters estimated with the proposed scattering setup are plausible.

show abstract

Section: Methodsmentioning

confidence: 99%

A Simple and Compact Laser Scattering Setup for Characterization of a Pulsed Low-Current Discharge

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Influence of Pulse Amplitude and Frequency on Plasma Properties of a Pulsed Low-Current High-Voltage Discharge Operated at Atmospheric Pressure

et al. 2022

View full text Add to dashboard Cite

Non-equilibrium conditions in plasma are often achieved by pulsed power delivery, where the pulse shape and repetition rate determine the properties of the plasma constituents and thus its chemical reactivity. The evaluation of the latter is becoming increasingly important to understand the observed effects, especially when new application fields are targeted. The composition of the plasma and the occurring chemical reactions can be calculated using various models. Thereby, the temperature of the electrons, the electron number density, as well as the heavy particle temperature are usually required as the basis of such calculations. In this work, the influence of pulse amplitude and repetition rate on these plasma parameters is determined by laser scattering for a low-current, high-voltage discharge operated with nitrogen at atmospheric pressure. In particular, the characteristic parameters regarding the plasma free electrons in such discharges have not yet been experimentally determined to this extent. The results are validated by spectroscopic measurements, i.e., the electron density is estimated from the Stark broadening of the hydrogen beta line and the heavy particle temperature is estimated by fitting the spectrum of nitrogen molecular transitions. Depending on the operating frequency, a pure nitrogen discharge with an input power of about 650 W displays an electron density between 1.7×1021m−3 and 2.0×1021m−3 with electron temperatures in the range of 40,000 K and heavy particle temperatures of about 6000 K in the core of the discharge channel. Furthermore, a relatively slow electron recombination rate in the range of 20 µs is observed.

show abstract

Application of Plasma Bridge for Grounding of Conductive Substrates Treated by Transferred Pulsed Atmospheric Arc

Korzec¹,

Hoffmann²,

Nettesheim³

2023

Plasma

View full text Add to dashboard Cite

An atmospheric pressure plasma jet (APPJ) sustained by a pulsed atmospheric arc (PAA) transferred on an electrically conducting surface was operated with a mean power of 700 W, a pulse frequency of 60 kHz, and a gas mixture of N2 and H2 with up to 10% H2, flowing at 30 to 70 SLM. It was shown that the plasma bridge ignited between the grounded injector and electrically conducting and floating substrates can be used for electrical grounding. This allowed for arc transfer on such substrates. The plasma bridge was stable for Argon flow through the injector from 3 to 10 SLM. Its length was between 5 and 15 mm. The plasma bridge current was 350 mA. The copper contact pads on an alumina electronic board were treated using the plasma bridge sustained by Ar injection for grounding. First, an oxide film of about 65 nm was grown by a compressed dry air (CDA) plasma jet. Then, this film was reduced at a speed of 4 cm2/s by forming gas 95/5 (95% of N2 and 5% of H2) plasma jet.

show abstract

Spectroscopic Characterization of a Pulsed Low-Current High-Voltage Discharge Operated at Atmospheric Pressure

Cited by 3 publications

References 66 publications

A Simple and Compact Laser Scattering Setup for Characterization of a Pulsed Low-Current Discharge

A Simple and Compact Laser Scattering Setup for Characterization of a Pulsed Low-Current Discharge

Influence of Pulse Amplitude and Frequency on Plasma Properties of a Pulsed Low-Current High-Voltage Discharge Operated at Atmospheric Pressure

Application of Plasma Bridge for Grounding of Conductive Substrates Treated by Transferred Pulsed Atmospheric Arc

Contact Info

Product

Resources

About