Abstract
Abstract High-Tc SQUID was applied for the detection of magnetized fine iron particles in motion. Two types of high-Tc SQUIDs with different magnetic field resolution were used. One is a large washer type and the other is a flux transformer type. It was shown that the magnetic field measured by the SQUID is proportional to the third power of diameter and is inversely proportional to the distance between the SQUID and the particle, as given by the electro-magnetic formula. As a result of the high magnetic field resolution and the quick response to transients, the SQUID detected an iron particle with 50 μm diameter at 800 m/min. This technique with high sensitive SQUID could be applicable to the in-line detection of iron particles inclusion in wires and fibers, as well as in food and medicine. This will contribute to an increased production yield and cope with the production liability.
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