The Concept of the SEMONT Monitoring System and its Influence on the EM Pollution Protection

1. The Concept of the SEMONT Monitoring System and its Influence on the EM Pollution Protection Nikola DjuricFaculty of Technical Sciences, University of Novi Sad

2. Content • The concept of the SEMONT monitoring system. • The broadband monitoring approach. • The monitoring bands. • The EM field register. • The exposure assessment approach. • The SEMONT system utilization. • Internet web portal. • Conclusion.

3. The SEMONT system concept Concept • Serbian electromagnetic field monitoring network – SEMONT. Fig. 1. System implementation over the area of interest.

4. Broadband monitoring approach • Provide information on the overall EM field level, without considering which sources are active over the area. Broadband Fig. 2. The broadband isotropic EM field monitoring.

5. The monitoring bands • The SEMONT sensor nodes performs broadband monitoring in multiband frequency ranges. Bands Fig. 3. The monitoring bands.

6. The EM field register (1/2) • The SEMONT system employ broadband measurements in combination with continuous monitoring, offering a history overview of field fluctuation during a period of time. Field register Fig. 4. The broadband isotropic EM field monitoring.

7. The EM field register (2/2) • The SEMONT system is intended for remote, the 24 hours a day monitoring, utilizing sensor nodes with considerable internal memory, solar panel and rechargeable batteries. Field register Table. 1. Memory and monitoring period of the sensor.

8. The exposure assessment approach (1/3) • Generally, the conventional measurement requires an extrapolation to the maximum power of source, since the “worst case” method is the only way to gain information on the exposure level that can be present in some area. Exposure Fig. 5. Example of extrapolation of EM field level.

9. The exposure assessment approach (2/3) • The continuous measurements overcame the problem of missing the period of the most intensive radiation of sources. The SEMONT monitoring is performed during the 24-hours period. Exposure Fig. 6. Daily limits of the global exposure ration (GER) assessment.

10. The exposure assessment approach (3/3) • Exploiting an approach of continuous monitoring, the SEMONT system assesses the GER and calculates lower and upper limits of daily exposure, according to the Serbian prescribed limits and ICNIRP recommendations. • For high-frequency electric field: • For the low-frequency magnetic field: • where real exposure will be in the range Exposure

11. The SEMONT system utilization (1/2) • The low-frequency application – overhead power lines are well known sources of the low frequency magnetic and electric field. Utilization Fig. 7. Monitoring field near overhead power lines.

12. The SEMONT system utilization (2/2) • The high-frequency application – the EM fields register simplifies procedure of the first and periodic testing of the radiation sources, as well as licensing the installation of new sources. Utilization Fig. 8. Testing of the radiation sources.

13. Internet web portal (1/2) Web portal Fig. 9. Presentation of the measurement results.

14. Internet web portal (2/2) Web portal Fig. 9. Presentation of the measurement results.

15. Conclusion • The SEMONT system introduces an approach of wireless sensor network utilization for a daily supervision of overall and cumulative EM field level. • The SEMONT system is able to offer respectable answers regarding the public concerns on actual and long-term exposure to EM radiation. • The system provides information on the overall EM field level at any instant of time, without considering which EM sources are present and active over the observed area. • It is convenient if it is necessary to inform the general population, without technical knowledge on EM field sources. • The SEMONT system could be a significant support for the local authorities in their efforts to perform systematic care considering health effects of non-ionizing radiation. Conclusion