Time-resolved optical emission imaging of an atmospheric plasma jet for different electrode positions with a constant electrode gap

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

doi:10.1088/0963-0252/24/2/025006

Cited by 38 publications

(35 citation statements)

References 41 publications

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“…5 (2). At this small inter electrode gap the length of the plasma jet outside the nozzle is also small, which may be due to the nearby ground electrode which neutralizes the positive charges by the polarization charges induced in the region, thus terminating its further propagation 22 , 23 . Further, the increase in the inter electrode gap leads to increase in the plasma length in the ambient air which is related to the increase in the ionization as the increased length of the discharge region.…”

Section: Resultsmentioning

confidence: 99%

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

Jaiswal

Aguirre

Prakash

2021

Sci Rep

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Creation of the “auroral” green line, a fascinating occurrence commonly observed in the upper atmosphere, has long been a difficult endeavor, especially at atmospheric pressure. Here we report strong emission of the “auroral” green line for the first time in a kHz frequency, linear field atmospheric pressure plasma jet system. The device used 99.999% pure argon as a working gas for the plasma generation. Optical emission spectroscopy measurements of the after discharge region show the existence of 557.7 nm emission which corresponds to the transition O($$^1$$ 1 S)–O($$^1$$ 1 D). The intensity of the produced green line is strong enough that the entire plasma plume in the ambient air is visible as a green plasma. We provide the chemical reactions of O($$^1$$ 1 S) production in the plasma and the estimation of the density of the O($$^1$$ 1 S) metastable state using the kinetic reactions. Further, the O($$^1$$ 1 S) emission is characterized by changing the flow rate of argon, applied voltage and electrode gap. The adequate plasma length ($$> 25 \, \hbox {mm}$$ > 25 mm ) along with the production of a variety of reactive components viz; OH, $${\hbox {N}}_{2}^{+}$$ N 2 + and oxygen (777 nm) make this configuration useful for applications such as: blood coagulation, cancer treatment, sterilization, and waste treatment. Moreover, this setup can be potentially used as a test bed for the in-depth understanding of plasma chemistry relevant to the aurora and comet tails using a laboratory setting.

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Section: Resultsmentioning

confidence: 99%

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

Jaiswal

Aguirre

Prakash

2021

Sci Rep

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“…Again, similar to VRMS, there is a small drop in the current when plasma is visually detached from the liquid surface. As it has been shown before, the behavior F i n a l of the plasma in plasma jet systems is influenced by the gas flow, geometrical features of the jet tube, geometry of the electrode system and dielectric properties of the target [35][36][37][38]. As distance between the tip of the plasma jet tube and the substrate increases two critical changes will occur.…”

Section: Optical Emission Spectra and Electrical Characterization Of The Plasma Jetmentioning

confidence: 86%

Destruction of chemical warfare surrogates using a portable atmospheric pressure plasma jet

et al. 2018

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Today's reality is connected with mitigation of threats from the new chemical and biological warfare agents. A novel investigation of cold plasmas in contact with liquids presented in this paper demonstrated that the chemically reactive environment produced by atmospheric pressure plasma jet (APPJ) is potentially capable of rapid destruction of chemical warfare agents in a broad spectrum. The decontamination of three different chemical warfare agent surrogates dissolved in liquid is investigated by using an easily transportable APPJ. The jet is powered by a kHz signal source connected to a low-voltage DC source and with He as working gas. The detailed investigation of electrical properties is performed for various plasmas at different distances from the sample. The measurements of plasma properties in-situ are supported by the optical spectrometry measurements, whereas the high performance liquid chromatography (HPLC) measurements before and after the treatment of aqueous solutions of Malathion, Fenitrothion and Dimetyl MetylPhosphonate. These soloutions are used to evaluate destruction and its efficiency for specific neural agent simulants. The particular removal rates are found to be from 56% up to 96% during 10 min treatment. The data obtained provide basis to evaluate APPJ's efficiency at different operating conditions. The presented results are promising and could be improved with different operating conditions and optimisation of the decontamination process.

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“…The current and voltage signals for In figure 2(b) current and voltage waveforms for the plasma jet are presented. The voltage waveform was recorded near the powered electrode and the current waveform was recorded as the voltage drop on the resistor near the grounded electrode as presented in Maletić et al [35]. The measured p-p value of the current was 6.92 mA and of the voltage was 8.0 kV.…”

Section: Electrical Properties Of the Capillary Plasma Jetmentioning

confidence: 99%

Comparison of laser induced breakdown spectroscopy and fast ICCD imaging for spatial and time resolved measurements of atmospheric pressure helium plasma jet

Maletic¹,

Popović²,

Puаč³

et al. 2022

Plasma Sources Sci. Technol.

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In this paper we compared the fast ICCD imaging with the newly developed diagnostic method that utilizes laser induced breakdown in plasma jet. Our helium plasma jet was powered by an 80 kHz high-voltage sine wave and propagated into the ambient air. Pulsed laser beam 1064 nm (4 ns pulse duration and 5 Hz repetition rate) was focused with the lens into the plasma jet at energy below breakdown threshold in helium. Laser pulses and the jet powering signal were synchronized. Laser induced plasma is highly dependent on the concentration of seed electrons and other charged particles in the plasma jet channel. We compared the radial profiles of the plasma jet obtained with these two methods. For laser induced breakdown it was ±0.5 mm and for ICCD measurement it was ±1.75 mm, while the ionization wave velocities obtained with these two methods were 15 km/s and 20 km/ respectively. Electrical characteristics of the plasma jet were also presented and one can see a large hysteresis effect when the applied power to the plasma jet was reducing. We show that the laser induced breakdown spectroscopy can be used as a complementary diagnostics technique with ICCD measurements.

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Time-resolved optical emission imaging of an atmospheric plasma jet for different electrode positions with a constant electrode gap

Cited by 38 publications

References 41 publications

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

A KHz frequency cold atmospheric pressure argon plasma jet for the emission of O(1S) auroral lines in ambient air

Destruction of chemical warfare surrogates using a portable atmospheric pressure plasma jet

Comparison of laser induced breakdown spectroscopy and fast ICCD imaging for spatial and time resolved measurements of atmospheric pressure helium plasma jet

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