  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.
