EMC’04/Sendai LOCALIZATION AND VISUALIZATION OF LOW-FREQUENCY ELECTROMAGNETIC SOURCES

It is important to determine the location of electromagnetic noise sources within the electrical and electronic equipment under real operating conditions, to reduce the undesired noise emissions from the equipment. In this work we develop a system to locate electromagnetic sources, especially low-frequency (< MHz) magnetic dipoles (current loops), by measuring the magnetic field distributions around the sources. We apply the MUSIC algorithm to estimate both the locations and orientations of the incoherent multiple current loops. With simulations and experiments we evaluate the performance and accuracy of the MUSIC algorithm. We then visualize the estimated sources superimposed on the actual camera image of the sources.