Title :
NDT of high speed fine particles by high Tc SQUID
Author :
Nagaishi, T. ; Kugai, H. ; Toyoda, H. ; Itozaki, H.
Author_Institution :
Res. Labs., Sumitomo Electr. Ind. Ltd., Itami, Japan
fDate :
6/1/1997 12:00:00 AM
Abstract :
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/.
Keywords :
SQUID magnetometers; magnetic particles; nondestructive testing; superconducting device noise; superconducting transformers; white noise; 0.17 to 83 m/s; 50 mum; Fe; Fe particle; HTS SQUID; NDT; high speed fine particles; magnetic field capture area; magnetic field resolution; moving magnetized fine particle detection; output signals; particle speed dependence; trilayered 15-turn flux transformer; white noise level; High temperature superconductors; Iron; Magnetic fields; Magnetic flux; Magnetic shielding; SQUID magnetometers; Signal resolution; Superconducting magnets; White noise; Wire;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
