EMF Measurement

Measurement of electromagnetic field environment.

Electromagnetic fields have established acute and undesirable physiological effects on body tissues that may be exacerbated by passive metallic implants, and may also present an EMC threat to active medical devices (both body-worn and implanted). Avoiding such issues minimizes the potential need for costly rework in the later stages of vehicle development when prototypes become available and ensures that brand value and market share are not damaged by adverse publicity.

Potential field exposure sources in the automotive environment include:

  • Traction batteries
  • High-voltage power cables
  • Wireless power transfer systems
  • Vehicle-mounted transmitters
  • On-board personal transmitters
  • Nearby transmitters

The physiological effects and exposure metrics that are involved vary in different frequency ranges. HORIBA MIRA is equipped with specialized field exposure instruments to assess in-vehicle fields, as well as other real-world field environments, against a variety of international standards and regulations. Examples include:

  • ICNIRP 1998 (general public and occupational, 0 Hz to 300 GHz)
  • 1999/519/EC (general public, 0 Hz to 300 GHz )
  • 2013/35/EU (occupational, 0 Hz to 300 GHz)

In addition, bespoke measurements can be carried out, for example, to extract individual field components, or to compare field measurements with other regulatory requirements.

Where measurements indicate that the in-vehicle environment is unlikely to comply with recommended field limits then numerical simulations using anatomically detailed human models may be the most practicable approach in order to assess compliance with limits on in-body quantities such as specific absorption rate (SAR, 100 kHz to 10 GHz) or induced internal electric field (1 Hz to 10 MHz).

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