Bidimensional characterization of the emission spectra in a direct current atmospheric pressure glow discharge

Orejas, Jaime; Pisonero, Jorge; Bordel, Nerea; Nelis, Thomas; Guillot, Philippe; Sanz‐Medel, Alfredo

doi:10.1016/j.sab.2012.06.044

Cited by 12 publications

(17 citation statements)

References 30 publications

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“…ion signal showed a slower decrease, vanishing + at 6 mm. These results agreed with the fact that the density of reactive oxygen radicals decreases rapidly with longer distance to discharge 40 . Alternatively, ion signal showed its maximum + at a distance of 2-3 mm and slowly decreased for larger distances.…”

Section: + +supporting

confidence: 89%

Evaluation of a modified halo flowing atmospheric pressure afterglow ion source for the analysis of directly injected volatile organic compounds

Fandiño

Orejas

Chauvet

et al. 2020

J. Anal. At. Spectrom.

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Section: + +supporting

confidence: 89%

Evaluation of a modified halo flowing atmospheric pressure afterglow ion source for the analysis of directly injected volatile organic compounds

Fandiño

Orejas

Chauvet

et al. 2020

J. Anal. At. Spectrom.

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“…On the other hand, to ensure stability, coefficient b in (6) must be positive. Provided that RA is negative, (8) states that R X must be bigger than R A , and (7) obliges τ C to be smaller than τ L , because τ L is always negative. Therefore, under steady-state conditions, there is a lower limit for the filtering inductor.…”

Section: Autonomy Of the Equipmentmentioning

confidence: 99%

“…Of course, precise laboratory techniques have been developed to measure the presence of heavy metals in water [2][3][4][5][6][7], but the use of plasma through air at atmospheric pressure has only been proposed recently [8][9][10][11]. In this technique, the absence of a vacuum chamber makes possible a portable device.…”

Section: Introductionmentioning

confidence: 99%

High-Voltage LC-Parallel Resonant Converter with Current Control to Detect Metal Pollutants in Water through Glow-Discharge Plasma

et al. 2022

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This paper presents a high-voltage power source to produce glow-discharge plasma in the frame of a specific application. The load has two well-differentiated types of behavior. To start the system, it is necessary to apply a high voltage, up to 15 kV, to produce air-dielectric breakdown. Before that, the output current is zero. Contrarily, under steady state, the output voltage is smaller (a few hundred volts) while the load requires current-source behavior to maintain a constant glow in the plasma. The amount of current must be selectable by the operator in the range 50 mA–180 mA. Therefore, very different voltage gains are required, and they cannot be easily attained by a single power stage. This work describes why the LC-parallel resonant topology is a good single stage alternative to solve the problem, and shows how to make the design. The step-up transformer is the key component of the converter. It provides galvanic isolation and adapts the voltage gain to the most favorable region of the LC topology, but it also introduces non-avoidable reactive components for the resonant net, determining their shape and, to some extent, their magnitude. In the paper, the transformer’s constructive details receive special attention, with discussion of its model. The experimental dynamic tests, carried out to design the control, show load behavior that resembles negative resistance. This fact makes any control loop prone to instability. To compensate this effect, a resistive ballast is proposed, eliminating its impact on efficiency with a novel filter design, based on an inductor, connected in series with the load beyond the voltage-clamping capacitor. The analysis includes a mathematical model of the filtering capacitor discharge through the inductor during the breakdown transient. The model provides insight into the dimensions of the inductor, to limit the discharge current peak and to analyze the overall performance on steady state. Another detail addressed is the balance among total weight, efficiency and autonomy, which appears if the filter inductor is substituted for a larger battery in autonomous operation. Finally, a comprehensive set of experimental results on the real load illustrate the performance of the power source, showing waveforms at breakdown and at steady state (for different output currents). Additionally, the detector’s constructive principles are described and its experimental performance is explored, showing results with two different types of metallic pollutants in water.

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“…0.5 Â 10 15 cm À3 to 3.0 Â 10 15 cm À3 as gas ow rate was increased from 0.5 to 1.5 L min À1 , but remained relatively constant with power. Orejas et al 87 have taken 2D images of an atmospheric pressure, helium GD source using zoom lenses coupled to an intensied CCD detector. Wavelength regions were isolated using bandpass lters to isolate emission produced by He*, N 2 + and O* revealing that He*, N 2 + were concentrated in regions close to the electrodes whereas O* emission appeared in most of the plasma volume.…”

Section: Fundamentalsmentioning

confidence: 99%

Atomic spectrometry updates: Review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2014

J. Anal. At. Spectrom.

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Bidimensional characterization of the emission spectra in a direct current atmospheric pressure glow discharge

Cited by 12 publications

References 30 publications

Evaluation of a modified halo flowing atmospheric pressure afterglow ion source for the analysis of directly injected volatile organic compounds

Evaluation of a modified halo flowing atmospheric pressure afterglow ion source for the analysis of directly injected volatile organic compounds

High-Voltage LC-Parallel Resonant Converter with Current Control to Detect Metal Pollutants in Water through Glow-Discharge Plasma

Atomic spectrometry updates: Review of advances in atomic spectrometry and related techniques

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