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Discrepancies of Measured SAR between Traditional and Fast Measuring Systems

Author

Listed:
  • Zicheng Liu

    (Chaire C2M, LTCI, Télécom Paris, 91120 Palaiseau, France)

  • Djamel Allal

    (Laboratoire National de Métrologie et d’Essais, 78197 Trappes, France)

  • Maurice Cox

    (National Physical Laboratory, Teddington TW11 0LW, UK)

  • Joe Wiart

    (Chaire C2M, LTCI, Télécom Paris, 91120 Palaiseau, France)

Abstract

Human exposure to mobile devices is traditionally measured by a system in which the human body (or head) is modelled by a phantom and the energy absorbed from the device is estimated based on the electric fields measured with a single probe. Such a system suffers from low efficiency due to repeated volumetric scanning within the phantom needed to capture the absorbed energy throughout the volume. To speed up the measurement, fast SAR (specific absorption rate) measuring systems have been developed. However, discrepancies of measured results are observed between traditional and fast measuring systems. In this paper, the discrepancies in terms of post-processing procedures after the measurement of electric field (or its amplitude) are investigated. Here, the concerned fast measuring system estimates SAR based on the reconstructed field of the region of interest while the amplitude and phase of the electric field are measured on a single plane with a probe array. The numerical results presented indicate that the fast SAR measuring system has the potential to yield more accurate estimations than the traditional system, but no conclusion can be made on which kind of system is superior without knowledge of the field-reconstruction algorithms and the emitting source.

Suggested Citation

  • Zicheng Liu & Djamel Allal & Maurice Cox & Joe Wiart, 2020. "Discrepancies of Measured SAR between Traditional and Fast Measuring Systems," IJERPH, MDPI, vol. 17(6), pages 1-13, March.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:6:p:2111-:d:335695
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    References listed on IDEAS

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    1. Emma Chiaramello & Marta Bonato & Serena Fiocchi & Gabriella Tognola & Marta Parazzini & Paolo Ravazzani & Joe Wiart, 2019. "Radio Frequency Electromagnetic Fields Exposure Assessment in Indoor Environments: A Review," IJERPH, MDPI, vol. 16(6), pages 1-29, March.
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    Cited by:

    1. Zicheng Liu & Djamel Allal & Maurice Cox & Joe Wiart, 2020. "Reply to “Comment on Liu et al. ‘Discrepancies of Measured SAR between Traditional and Fast Measuring Systems’ Int. J. Environ. Res. Public Health , 2020, 17 , 2111”," IJERPH, MDPI, vol. 17(15), pages 1-4, July.
    2. Mark Douglas & Niels Kuster, 2020. "Comment on Liu et al. “Discrepancies of Measured SAR between Traditional and Fast Measuring Systems.” Int. J. Environ. Res. Public Health , 2020, 17 , 2111," IJERPH, MDPI, vol. 17(14), pages 1-4, July.

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