WP 4: Evaluation of exposure linked to different uses and functions
Collaborators: IMEC; Orange
The exposure induced by wireless communication systems depends on the power emitted by the systems, the communication protocols and the frequency bands used. The exposure and its spatial distribution also depend strongly on the relative position of the devices (mobile phone, tablet PC). Studies conducted in recent years have focused primarily on compliance to standards using test systems configurations, with the device in contact with the body or very close to it. These settings do not always correspond to current uses of the devices. Today the position of the mobile is very variable, unlike in the 90s when the phone was almost used near the ear. Digital information transfer, new patterns of use (such as multimedia glasses) may induce highly variable exposures, even when the transmitted power is similar. This is the case for example when using a phone: in «speaker» or «headset» mode, the same voice use will result in very different brain exposure than when the phone is near the ear.
To evaluate the specific absorption rate (SAR) related to different uses and functions (Studied in WPs 1-3). The goal is to evaluate human exposure induced by wireless communication systems as a function of device, network technologies, protocols and position of use.
To achieve this objective WP4 will
• Conduct a bibliographic analysis and compile information on the topic from the CREST partners. Many studies have been conducted. The goal is to compile existing dosimetric data on whole body and local (averaged over 10g, 1g, the brain, etc …) SAR for the sources and positions identified in WP1;
• Conduct numerical dosimetric studies in new and yet unstudied configurations identified in the project (e.g. multimedia glasses, close to femtocell) using the FDFDT method. Numerical models of the source (device) and of the human heterogeneous body will be used;
• Conduct a study on the influence of the variability of the relative positions of the sources linked to different uses (e.g. variability in the position of a tablet on the knees, a mobile phone near the head …) to estimate uncertainties associated with these exposure estimates.