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Discrepancies of Measured SAR between Traditional and Fast Measuring Systems

Liu, Z; Allal, D; Cox, M; Wiart, J (2020) Discrepancies of Measured SAR between Traditional and Fast Measuring Systems. International Journal of Environmental Research and Public Health, 17 (6). 2111 ISSN 1660-4601

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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 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.

Item Type: Article
Keywords: specific absorption rate; fast SARmeasurement; field reconstruction; plane-wave expansion; traditional SAR measurement; measurement discrepancy; uncertainty analysis
Subjects: Electromagnetics > Electrical Measurement
Divisions: Data Science
Identification number/DOI: 10.3390/ijerph17062111
Last Modified: 18 Sep 2020 12:39
URI: http://eprintspublications.npl.co.uk/id/eprint/8849

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