SQUID application research in Japan

Japanese research activities using SQUIDs are reviewed in this paper. Low-T-c SQUIDS are applied to multi-channel systems for magnetoencephalogram (MEG) and magnetocardiograrn (MCG). High-T-c SQUIDS are applied to MCG, nondestructive evaluation (NDE), SQUID microscopy, biological testing using fine magnetic markers, geological surveying, food inspection, large-scale integration (LSI) defect analysis and SQUID-NQR (nuclear quadrupole resonance). These applications of SQUIDs are being researched and developed actively and some of them are expected to be in the commercial market in the near future.