Keywords: Gradients, Gradients
Motivation: Commercial dynamic field camera measures gradient eddy current fields in the magnet, where magnet eddy current can confound gradient coil’s internal eddy current fields.
Goal(s): To develop a field monitoring device, called dB/dt camera, to map short-time-constant eddy current fields on a standalone gradient coil.
Approach: A circular array of 22 untuned pickup coils was placed inside two different gradient coils outside the magnet and the step response functions were measured and compared.
Results: Eddy current fields with time constant ~100 μs were measured consistent with prior imaging results. The amplitudes correlated with the thickness of the conductors of the gradient coils.
Impact: The proposed method enables time-resolved gradient eddy current field mapping without the magnet or power electronics. The method can help isolate eddy current sources in the gradient coil or RF subsystem.
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