WIENER FILTERING APPLIED TO MAGNETIC NEAR FIELD SCANNING

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