Fig. 2: NMR magnetic sensor array.
From: Nuclear magnetic resonance for wireless magnetic tracking
a The NMR magnetic sensor and the resonator circuit. b, c The magnetic field measurement of 0.65 emu magnetic dipole. The solid lines are the analytic model at different orientations. Points show the mean value and error bars represent the standard deviation (s.d.) of measured magnetic field. d The 3D configuration of the hexagonal sensor array and reference sensor in axial and top views. e The tracking workspace for 1 emu soft magnet. The dashed lines are the average magnetic field measured by seven sensors. The blue color map is the expected tracking precision.
