Distance Calibration of Large PCB Induction-Coil Arrays in ActiveMode |
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| Melvin Liebsch, Olaf Dunkel, Andrea Del Carme Fontanet Valls, Stephan Russenschuck, Stefan Kurz |
- Abstract:
- Rotating- and translating coil systems for magnetic measurement of particle accelerator magnets rely on induction-coil arrays often built in printed circuit board technology. For the accurate calculation of field gradients from induced voltages, the distances between the coils need to be calibrated. In this paper we present a calibration approach, based on the operation of the PCB in active mode, i.e., exciting the coils with a small current. The resulting flux density distribution is scanned with a uni-axial Hall probe, translated by the stages of a coordinatemeasuring machine (CMM). The proposed calibration approach does not rely on field absolutes. Geometric coil distances are computed only from zero crossings of the measured signal. In this way, a low field sensor calibration can be avoided and systematic errors are reduced.
- Download:
- IMEKO-TC4-2020-39.pdf
- DOI:
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