Table 1 Comparing theoretical and measured values (in brackets) of the efficiency for the coil designs when wound as field and gradient coils.

From: Balanced, bi-planar magnetic field and field gradient coils for field compensation in wearable magnetoencephalography

Coil

Efficiency as field coil (nT/mA)

Efficiency as gradient coil (nT/m/mA)

Single plane Inductance (μH)

Bx and Gx

0.74 (0.57 ± 0.01)

1.20 (1.11 ± 0.02)

169 (192)

By and Gy

0.74 (0.47 ± 0.02)

1.20 (0.98 ± 0.02)

169 (193)

Bz and Gz

3.9 (3.6 ± 0.3)

4.6 (4.5 ± 0.7)

379 (385)

  1. Errors are the standard deviation from the mean of measurements taken across three OPMs spatially separated in z. The single plane inductances are also reported.
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