Numerical Exposure Assessment Method for Low Frequency Range and Application to Wireless Power Transfer

2016 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 1354

Study snapshot

Publicationmanual · 2016

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Numerical Exposure Assessment Method for Low Frequency Range and Application to Wireless Power Transfer Park S, Kim M. Numerical Exposure Assessment Method for Low Frequency Range and Application to Wireless Power Transfer. PLoS One. 2016 Nov 29;11(11):e0166720. doi: 10.1371/journal.pone.0166720. Abstract In this paper, a numerical exposure assessment method is presented for a quasi-static analysis by the use of finite-difference time-domain (FDTD) algorithm. The proposed method is composed of scattered field FDTD method and quasi-static approximation for analyzing of the low frequency band electromagnetic problems. The proposed method provides an effective tool to compute induced electric fields in an anatomically realistic human voxel model exposed to an arbitrary non-uniform field source in the low frequency ranges. The method is verified, and excellent agreement with theoretical solutions is found for a dielectric sphere model exposed to a magnetic dipole source. The assessment method serves a practical example of the electric fields, current densities, and specific absorption rates induced in a human head and body in close proximity to a 150-kHz wireless power transfer system for cell phone charging. The results are compared to the limits recommended by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the IEEE standard guidelines. Open access: journals.plos.org

Machine Enhanced Logic

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

Populationanatomically realistic human voxel model (human head and body)

Sample sizeNot supplied

ExposureELF · 0.15 MHz

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

A numerical exposure assessment method using scattered-field FDTD and quasi-static approximation is presented for low-frequency electromagnetic problems. The method showed excellent agreement with theoretical solutions for a dielectric sphere exposed to a magnetic dipole source, and was applied to compute induced electric fields, current densities, and SAR in a human head and body near a 150-kHz wireless power transfer system, with results compared to ICNIRP and IEEE guideline limits.

Outcomes measured

induced electric fields
current densities
specific absorption rates (SAR)
agreement with theoretical solutions (verification)
comparison to ICNIRP limits
comparison to IEEE standard guidelines

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "ELF",
    "source": "wireless power transfer",
    "frequency_mhz": 0.15,
    "sar_wkg": null,
    "duration": null
  },
  "population": "anatomically realistic human voxel model (human head and body)",
  "sample_size": null,
  "outcomes": [
    "induced electric fields",
    "current densities",
    "specific absorption rates (SAR)",
    "agreement with theoretical solutions (verification)",
    "comparison to ICNIRP limits",
    "comparison to IEEE standard guidelines"
  ],
  "main_findings": "A numerical exposure assessment method using scattered-field FDTD and quasi-static approximation is presented for low-frequency electromagnetic problems. The method showed excellent agreement with theoretical solutions for a dielectric sphere exposed to a magnetic dipole source, and was applied to compute induced electric fields, current densities, and SAR in a human head and body near a 150-kHz wireless power transfer system, with results compared to ICNIRP and IEEE guideline limits.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "finite-difference time-domain (FDTD)",
    "quasi-static approximation",
    "scattered field",
    "low frequency",
    "wireless power transfer",
    "150 kHz",
    "cell phone charging",
    "human voxel model",
    "induced electric field",
    "current density",
    "SAR",
    "ICNIRP",
    "IEEE"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.6,
      "reason": "Results are compared to ICNIRP recommended limits and IEEE guidelines."
    }
  ]
}

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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: 10.1371/journal.pone.0166720
PubMed: Not supplied

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