Coverage factors for efficient demonstration of compliance of low-frequency magnetic near-field exposures with basic restrictions

Abstract

Overview

Regulators mandate that systems involving wireless power transfer (WPT) and other sources generating strong magnetic fields be compliant with established basic restrictions (BR). These restrictions are crucial for safeguarding human health against potential adverse effects from electromagnetic fields.

Findings

• Methodology: The study introduces an efficient approach using a homogeneous phantom with a coverage factor, significantly reducing the need for multiple simulations.
• Local Field Effects: It highlights how non-uniform fields from local sources such as WPT transmitters can exceed set reference levels (RL) while induced field strengths remain safe under BR.
• Data Analysis: Derived coverage factors from statistical analysis show great variability (1 to 9) depending on the dosimetric quantity, underscoring the complexity of electromagnetic field interactions with human tissues.

Conclusion

The application of coverage factors can reduce the need for extensive simulations, making compliance testing more feasible and practical. However, occasional use-case simulations may reveal underestimations in exposure, indicating inherently high variability and potential underestimation of risks associated with electromagnetic fields.