Electromagnetic dosimetry for adult and child models within a car: multi-exposure scenarios

Abstract

International audienceThis paper deals with the numerical dosimetry for adult and children models exposed to CW signals of several wireless communication systems (UMTS, WiMax, and Bluetooth) within a partly shielded environment represented by a realistic car model. More than 20 mono-and multi-source exposure scenarios are considered. Computational results demonstrate that, for all considered exposure scenarios, the specific absorption rate (SAR) is at least 40 times (whole-body average) and 10 times (local SAR) lower than the exposure limits fixed by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The whole-body average SAR values for children are found to be typically 1.1-1.3 times higher than those of adults. Under several exposure scenarios, the local SAR in the limbs of children models is 2-3 times higher than corresponding values in adult models. The power density distributions within the car have been also analyzed for one, two, and three simultaneously emitting devices. The results show that the homogeneity of the power density distribution increases with increasing number of simultaneously operating transmitters. These data suggest that the use of several wireless communication devices within a car leads to exposure levels that are several orders of magnitude below international exposure limits, even for the multi-exposure scenarios for both adult and children models

Radio Frequency Electromagnetic Fields Exposure Assessment in Indoor Environments: A Review

“…Some studies focused on the assessment of the RF-EMF exposure inside road vehicles by using computational methods [66,67,68]. In the study by Harris and colleagues [66] numerical dosimetry for adult and children models exposed to several wireless communication systems (UMTS, WiMax, and Bluetooth) localized in different positions within a partly shielded environment represented by a realistic car model, considering different exposure scenarios. Results showed that for a single operating device, the maximum whole body SAR for adults and for children exposure is 1.39 and 1.58 mW/kg, respectively.…”

Electromagnetic fields in body by wireless inductive system

“…This cell size takes into consideration the computer resources that would be required for the numerical simulation. We determine the dielectric properties of the human body by "two-thirds muscle" approximation at the operating frequency (Harris et al, 2011). The relative permittivity and conductivity of the human model, which are taken from the IFAC tissue database according to the operating frequency of the system, are 8,312 and 0.2316 S/m, respectively (Gabriel et al, 1996).…”

Review of Contactless Energy Transfer Concept Applied to Inductive Power Transfer Systems in Electric Vehicles

“…The consequent models are of two refinements, homogeneous and inhomogeneous. For the first ones, the dielectric belongings are generally endorsed to a 2/3 equivalent muscle model [90]. For inhomogeneous models, ghost models of layered stuff are built on magnetic resonance imaging (MRI), computed tomography and arithmetic imaging techniques, offering exactness of tissue profile to the nearest millimeter [91,92].…”