Abstract
We have developed a non-contact current measurement system, which converts magnetic flux distribution measured with high sensitivity using DC-SQUID into current distribution. The DC-SQUID is composed of Nb/AlO x /Nb junctions with high thermal reliability, and a pickup coil. The diameter of the pickup coil and the standoff distance between the DC-SQUID and samples, which are important parameters for the spatial resolution, are respectively 200 and 500 μm . The spatial resolution is 200 μm and the current noise density calculated from the magnetic noise is 6.8 nA/ Hz . We have applied the system to a solar cell to visualize the area, which does not generate electrical power.
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