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정밀 뇌자도 측정을 위한 넓은 영역에서의 제로필드 구현기술
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- Issue Date
- 2026-06
- Citation
- 대한전자공학회 학술 대회 (하계) 2026, pp.1-3
- Publisher
- 대한전자공학회
- Language
- Korean
- Type
- Conference Paper
- Abstract
- To measure faint brain magnetic fields using Magnetoencephalography (MEG) such as Optically Pumped Magnetometers (OPM), a highly uniform zero-magnetic-field environment is essential. Conventional square Helmholtz coils restrict the uniform field volume because the optimal distance between coils is strictly limited to half the side length. In this paper, we propose a novel dual-coil structure to extend the distance between coils while maintaining magnetic field uniformity. The proposed structure consists of an outer coil (18 mm) and an inner coil (11 mm) separated by a wide distance of 33 mm. By applying currents in opposite directions to the inner and outer coils, we effectively compensate for the field degradation at the center. Electromagnetic simulations confirm that the proposed structure significantly enlarges the uniform zero-field volume compared to conventional designs, making it highly suitable for practical MEG applications requiring larger spatial clearance.
- KSP Keywords
- Electromagnetic simulation, Field Environment, Field uniformity, Helmholtz coils, Magnetic field, Optically pumped, Spatial clearance, optimal distance, uniform field