Developing exposure systems: The CNRS engineering group at work for GOLiAT

The CNRS engineering group is working on the design, the development and the characterisation of exposure systems for biological experiments. Accurate knowledge of the electromagnetic systems to be used and the induced dose are crucial for biological investigations in GOLiAT. Our objective is to build adequate and well characterized setups for the in vitro, in vivo, and human experiments of 5G exposure at 0.7, 3.5, and 26 GHz, three frequency bands specific to 5G.

The CNRS engineering group (CNRS- Limoges) develops exposure setups in collaboration with partners involved in GOLiAT work packages (WP) 3, 4 and 5: UNIROMA1, CNRS-Bordeaux, CNRS-Toulouse, INERIS, National Public Health Center (Hungary), Univ. Bologna, Univ. of Pécs (Hungary). The expected exposure levels are 0.08, 0.4, 4 W/kg for the SAR (Specific Absorption Rate) at 700 MHz and 3.5 GHz, and 10, 50, 100 W/m² power densities at 26 GHz.

The image gallery belows shows the setups for different experiments addressed to assess exposure to 5G developep by the CNRS engineering group.

WP3 – In vitro exposure systems 700 MHz

Exposure system for thermoregulation experiments on ion channels using BRET measurement (installed in CNRS-Bordeaux), and exposure system for CNS cells (installed in CNRS-Bordeaux).

 

 

 

 

WP3 – In vitro exposure systems 3.5 GHz

3.5 GHz: compact mode-stirred reverberation chamber incubator adapted for specific biological holders dedicated to skin cells; the incubator will also preserve the biological proper environment, and allow long time (several hours, days) exposure to 5G signals (installed in CNRS-Bordeaux).

 

WP3 – Dosimetry

Dosimetry is performed by numerical and experimental methods. In vitro, temperature measurements will be recorded to retrieve SAR values. Experimental dosimetry below 6 GHz uses SAR (W/kg) to quantify exposure levels and power density (W/m²) for 26 GHz.

 

WP3 Development of setups that allows for biological exposure

To complete the exposure setup, it is important to generate and control the signal and most of the critical parameters of the setup: incident power, frequency, forward and reverse power, temperature, … A graphic user interface (GUI) has been developed for control and monitoring.