Performance Evaluation and Calibration of Electromagnetic Field (EMF) Area Monitors Using a Multi-Wire Transverse Electromagnetic (MWTEM) Transmission Line.

Abstract

The exposure levels generated by environmental electromagnetic field (EMF) sources can be measured and monitored by employing EMF area monitors. The operating spectrum of environmental EMF sources is not limited to high frequencies ( > 30 MHz) but also extends to low frequencies ( < 30 MHz), where sources associated, for example, with radio transmitters typically generate non-negligible field contributions. For this reason, professional EMF area monitors can be equipped with different field sensors, properly calibrated according to standardized procedures. Because low-frequency electric fields are very sensitive to environmental boundary conditions, equipping an EMF area monitor with electric field sensors, previously calibrated as stand-alone devices, can lead to measurement errors due to field perturbations introduced by the physical structure of the area monitor itself. This paper describes the activities carried out to assess the performance of an EMF area monitor in simulated realistic conditions and calibrate it in the 300 kHz-20 MHz frequency band. The activities were conducted using a multi-wire transverse electromagnetic (MWTEM) transmission line as a controlled electric field source, with dimensions suitable for exposure of the entire structure of the EMF area monitor. In view of using this approach to calibrate the area monitors as a whole instead of the individual sensors, the uniformity of the electric field generated by the available MWTEM transmission line was analyzed in detail both numerically and experimentally. Finally, the results of the evaluation and calibration of an area monitor are reported and discussed.

AI evidence extraction

Main findings

The paper describes using a MWTEM transmission line as a controlled electric-field source to analyze field uniformity (numerically and experimentally) and to evaluate and calibrate an EMF area monitor as a whole in the 300 kHz–20 MHz band. Results of the evaluation and calibration are reported and discussed, but specific quantitative outcomes are not provided in the abstract.

Outcomes measured

• Performance evaluation of an EMF area monitor under simulated realistic conditions
• Calibration of an EMF area monitor in the 300 kHz–20 MHz frequency band
• Numerical and experimental assessment of electric-field uniformity generated by a multi-wire transverse electromagnetic (MWTEM) transmission line
• Assessment of measurement errors/field perturbations due to integrating previously stand-alone calibrated electric-field sensors into an area monitor structure

Limitations

• Abstract does not report quantitative calibration results or performance metrics.
• No details provided on the specific area monitor model, sensor types, or calibration uncertainties.
• No information on number of measurements/replicates or experimental conditions beyond general description.

Suggested hubs

• occupational-exposure (0.2)
  Mentions environmental EMF monitoring and calibration of professional area monitors; not explicitly occupational but potentially relevant to workplace monitoring contexts.

{
    "study_type": "engineering",
    "exposure": {
        "band": "RF",
        "source": "environmental EMF sources / area monitor calibration",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": null
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Performance evaluation of an EMF area monitor under simulated realistic conditions",
        "Calibration of an EMF area monitor in the 300 kHz–20 MHz frequency band",
        "Numerical and experimental assessment of electric-field uniformity generated by a multi-wire transverse electromagnetic (MWTEM) transmission line",
        "Assessment of measurement errors/field perturbations due to integrating previously stand-alone calibrated electric-field sensors into an area monitor structure"
    ],
    "main_findings": "The paper describes using a MWTEM transmission line as a controlled electric-field source to analyze field uniformity (numerically and experimentally) and to evaluate and calibrate an EMF area monitor as a whole in the 300 kHz–20 MHz band. Results of the evaluation and calibration are reported and discussed, but specific quantitative outcomes are not provided in the abstract.",
    "effect_direction": "unclear",
    "limitations": [
        "Abstract does not report quantitative calibration results or performance metrics.",
        "No details provided on the specific area monitor model, sensor types, or calibration uncertainties.",
        "No information on number of measurements/replicates or experimental conditions beyond general description."
    ],
    "evidence_strength": "insufficient",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "EMF area monitor",
        "calibration",
        "performance evaluation",
        "electric field",
        "low frequency",
        "300 kHz–20 MHz",
        "MWTEM",
        "multi-wire transverse electromagnetic transmission line",
        "field uniformity",
        "environmental EMF monitoring"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.200000000000000011102230246251565404236316680908203125,
            "reason": "Mentions environmental EMF monitoring and calibration of professional area monitors; not explicitly occupational but potentially relevant to workplace monitoring contexts."
        }
    ]
}

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