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NDT of high speed fine particles by high Tc SQUID

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4 Author(s)
Nagaishi, T. ; Res. Labs., Sumitomo Electr. Ind. Ltd., Itami, Japan ; Kugai, H. ; Toyoda, H. ; Itozaki, H.

We detected moving magnetized fine particles with high Tc SQUIDs. The output signals of SQUIDs were investigated with various particle speeds. It was found that the signal decreases less than 20% with an increase of particle speed from 10 to 500 m/min. An iron particle of 50 /spl mu/m diameter could be detected by the SQUID. The high Tc SQUID had a trilayered 15-turn flux transformer. It has a magnetic field resolution of 48 fT Hz/sup -1/2/ at white noise level and a magnetic field capture area of 2.7 mm/sup 2/.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:7 ,  Issue: 2 )