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

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

2886

Lastpage

2889

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621895

Filename

621895