Wiener filtering applied to magnetic near field scanning

Abstract

Magnetic near-field scanning is a growing-up technique in power electronics. However, due to the large size of the devices, a trade-off is necessary to find between the spatial resolution of the field and the measurement time, this one is often unsatisfying. In this paper, we propose to improve drastically this trade-off by using a signal-processing technique (Wiener filtering) which allows a large scanning step (short scanning duration) while keeping an accurate spatial resolution of the magnetic field. This technique is adapted to the magnetic near-field probing, as described in the paper. Our experiments show that a factor 25 can be gained on the product "resolution-×-duration" of the measurements.