Abstract
Modern electronics are always composed of the printed circuit board (PCB). When the currents on the PCB are visualized without decomposing the electronic devices, the testing and inspecting of the electronic devices can be carried out in an extremely efficient manner.
This paper proposes one of the methodologies to visualize a current distribution on the PCB from the locally measured magnetic fields. The current visualization from the magnetic fields always results in a solution of the ill-posed inverse problem. This paper reveals that conventional least squares method gives a reasonable solution of the inverse problem. Thus, we have succeeded in realizing a nondestructive testing methodology with high reliability.
