[Determination of electric field distribution in dielectric barrier surface glow discharge by spectroscopic method].

Guang pu xue yu guang pu fen xi = Guang pu · 2008 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 2797

Study snapshot

PublicationGuang pu xue yu guang pu fen xi = Guang pu · 2008

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

In the present paper, stable glow discharges were obtained in air at low pressure with a dielectric barrier surface discharge device. Light emission from the discharge was detected by photomultiplier tubes and the research results show that the light signal exhibited one discharge pulse per half cycle of the applied voltage. The light pulses were asymmetric between the positive half cycle and the negative one of the applied voltage. The images of the glow surface discharge were processed by Photoshop software and the results indicate that the emission intensity remained almost constant for different places with the same distance from the powered electrode, while the emission intensity decreased with the distance from the powered electrode increasing. In dielectric barrier discharge, net electric field is determined by the applied voltage and the wall charges accumulated on the dielectric layer during the discharge, and consequently, it is important to obtain information about the net electric field distribution. For this purpose, optical emission spectroscopy method was used. The distribution of the net electric field can be deduced from the intensity ratio of spectral line 391.4 nm emitted from the first negative system of N2+ (B 2sigma u+ -->X 2sigma g+) to 337.1 nm emitted from the second positive system of N2 (C 3IIu-B 3IIg). The research results show that the electric field near the powered electric field is higher than at the edge of the discharge. These experimental results are very important for numerical study and industrial application of the surface discharge.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Stable glow discharges in air at low pressure were obtained; the light signal showed one discharge pulse per half cycle of the applied voltage with asymmetry between positive and negative half cycles. Emission intensity was almost constant at locations with the same distance from the powered electrode and decreased with increasing distance. Using optical emission spectroscopy (391.4 nm/337.1 nm intensity ratio), the net electric field was inferred to be higher near the powered electrode than at the edge of the discharge.

Outcomes measured

Electric field distribution in dielectric barrier surface glow discharge
Optical emission intensity distribution
Spectral line intensity ratio (391.4 nm N2+ / 337.1 nm N2) as proxy for net electric field

Limitations

No biological/health outcomes assessed
No quantitative values for applied voltage, frequency, pressure, or electric field reported in the abstract
Sample size/number of experiments not stated

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "dielectric barrier surface glow discharge device",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Electric field distribution in dielectric barrier surface glow discharge",
    "Optical emission intensity distribution",
    "Spectral line intensity ratio (391.4 nm N2+ / 337.1 nm N2) as proxy for net electric field"
  ],
  "main_findings": "Stable glow discharges in air at low pressure were obtained; the light signal showed one discharge pulse per half cycle of the applied voltage with asymmetry between positive and negative half cycles. Emission intensity was almost constant at locations with the same distance from the powered electrode and decreased with increasing distance. Using optical emission spectroscopy (391.4 nm/337.1 nm intensity ratio), the net electric field was inferred to be higher near the powered electrode than at the edge of the discharge.",
  "effect_direction": "unclear",
  "limitations": [
    "No biological/health outcomes assessed",
    "No quantitative values for applied voltage, frequency, pressure, or electric field reported in the abstract",
    "Sample size/number of experiments not stated"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "dielectric barrier discharge",
    "surface glow discharge",
    "electric field distribution",
    "optical emission spectroscopy",
    "photomultiplier tube",
    "nitrogen spectral lines",
    "N2+ first negative system",
    "N2 second positive system"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: Not supplied
PubMed: 19248473

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