SQUID systems for non-destructive testing by AC field mapping

Author

Cochran, A. ; Morgan, L.N.C. ; Bowman, R.M. ; Kirk, K.J. ; Donaldson, G.B.

Author_Institution

Dept. of Phys. & Appl. Phys., Strathclyde Univ., Glasgow, UK

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1926

Lastpage

1929

Abstract

The authors describe a low-temperature liquid-helium superconducting quantum interference device (SQUID) system with high spatial resolution and a wider bandwidth than usual for an all-metal cryostat and which also provides access for a mechanism to balance the pick-up coils. They discuss the effects of these properties on AC field measurement and present experimental results from small slits which mimic growing fatigue cracks. Related work on high-temperature superconducting devices indicates that they will offer important advantages over low-temperature SQUIDs, particularly in terms of cryogenic design which has been so restrictive in low-temperature systems. The authors suggest that even relatively poor high-temperature-superconductor SQUID performance will be acceptable if these advantages can be exploited.<>

Keywords

SQUIDs; crack detection; field plotting; flaw detection; magnetic field measurement; magnetometers; AC field mapping; NDT; SQUID systems; bandwidth; cryogenic design; flaw detection; growing fatigue cracks; high-temperature superconducting devices; low-temperature SQUIDs; low-temperature liquid-helium superconducting quantum interference device; magnetic field maps; nondestructive testing; pick-up coils; small slits; spatial resolution; Bandwidth; Fatigue; High temperature superconductors; Interference; Nondestructive testing; SQUIDs; Spatial resolution; Superconducting coils; Superconducting devices; System testing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233584

Filename

233584