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Enhancement of LIBS emission using antenna-coupled microwave.

Optics express · 2013 · Benefit · Insufficient evidence

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BenefitInsufficient evidencePaper 3110

Microwave radiation introduced via a 3 mm diameter loop antenna was absorbed by the laser-induced plasma and significantly enhanced LIBS emission, producing higher-temperature and longer-lifetime plasma emission. Reported enhancement of Gd spectral lines was …

Study snapshot

PublicationOptics express · 2013
Study typeengineering
Reported directionBenefit
Evidence ratingInsufficient

Abstract

Intensified microwave coupled by a loop antenna (diameter of 3 mm) has been employed to enhance the laser-induced breakdown spectroscopy (LIBS) emission. In this method, a laser plasma was induced on Gd₂O₃ sample at a reduced pressure by focusing a pulsed Nd:YAG laser (532 nm, 10 ns, 5 mJ) at a local point, at which electromagnetic field was produced by introducing microwave radiation using loop antenna. The plasma emission was significantly enhanced by absorbing the microwave radiation, resulting in high-temperature plasma and long-lifetime plasma emission. By using this method, the enhancement of Gd lines was up to 32 times, depending upon the emission lines observed. A linear calibration curve of Ca contained in the Gd₂O₃ sample was made. The detection limit of Ca was approximately 2 mg/kg. This present method is very useful for identification of trace elements in nuclear fuel and radioactive materials.

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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 directionbenefit
PopulationNot supplied
Sample sizeNot supplied
Exposuremicrowave
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Microwave radiation introduced via a 3 mm diameter loop antenna was absorbed by the laser-induced plasma and significantly enhanced LIBS emission, producing higher-temperature and longer-lifetime plasma emission. Reported enhancement of Gd spectral lines was up to 32×, and the Ca detection limit in Gd2O3 was approximately 2 mg/kg.

Outcomes measured

  • LIBS plasma emission intensity
  • Plasma temperature (high-temperature plasma)
  • Plasma emission lifetime
  • Enhancement factor of Gd spectral lines
  • Calibration curve for Ca in Gd2O3
  • Detection limit for Ca (~2 mg/kg)

Limitations

  • Microwave frequency and exposure parameters (e.g., power) not stated in the abstract
  • No sample size or number of measurements reported
  • Study is an instrumentation/analytical method description rather than a biological/health assessment
View raw extracted JSON
{
  "study_type": "engineering",
  "exposure": {
    "band": "microwave",
    "source": "antenna-coupled microwave (loop antenna)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "LIBS plasma emission intensity",
    "Plasma temperature (high-temperature plasma)",
    "Plasma emission lifetime",
    "Enhancement factor of Gd spectral lines",
    "Calibration curve for Ca in Gd2O3",
    "Detection limit for Ca (~2 mg/kg)"
  ],
  "main_findings": "Microwave radiation introduced via a 3 mm diameter loop antenna was absorbed by the laser-induced plasma and significantly enhanced LIBS emission, producing higher-temperature and longer-lifetime plasma emission. Reported enhancement of Gd spectral lines was up to 32×, and the Ca detection limit in Gd2O3 was approximately 2 mg/kg.",
  "effect_direction": "benefit",
  "limitations": [
    "Microwave frequency and exposure parameters (e.g., power) not stated in the abstract",
    "No sample size or number of measurements reported",
    "Study is an instrumentation/analytical method description rather than a biological/health assessment"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave",
    "loop antenna",
    "laser-induced breakdown spectroscopy",
    "LIBS",
    "Nd:YAG laser",
    "plasma emission",
    "Gd2O3",
    "trace element detection",
    "calibration curve",
    "detection limit"
  ],
  "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: 10.1364/oe.21.029755
PubMed: 24514526

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