Measurements of surface-breaking flaws in ferromagnetic plates by means of an imaging SQUID susceptometer

Measurements of surface-breaking flaws in ferromagnetic plates by means of an imaging SQUID susceptometer

We detected sub-millimeter surface-breaking flaws in ferromagnetic plates using an imaging SQUID susceptometer. The normal component of the field was imaged with an axial, first order gradiometer with 3 mm diameter coils and a 4 cm baseline. We mapped the field above mild steel test samples, detecti...

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Veröffentlicht in:IEEE transactions on applied superconductivity 1995-06, Vol.5 (2), p.2482-2485
Hauptverfasser: Bruno, A.C., Ewing, A.P., Wikswo, J.P.
Format: Artikel
Sprache:eng
Schlagworte:
Coils
Extraterrestrial measurements
Magnetic field measurement
Magnetic flux leakage
Magnetic shielding
Spatial resolution
SQUID magnetometers
Steel
Superconducting magnets
Testing
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Zusammenfassung:We detected sub-millimeter surface-breaking flaws in ferromagnetic plates using an imaging SQUID susceptometer. The normal component of the field was imaged with an axial, first order gradiometer with 3 mm diameter coils and a 4 cm baseline. We mapped the field above mild steel test samples, detecting field distortions due to surface flaws with volumes as small as 0.1 cubic millimeter. A comparison is made with conventional flux leakage methods. Our method of observing distortions in a perpendicularly applied field may be more sensitive for detecting surface-breaking flaws. Image enhancement techniques successfully removed background signals with low spatial frequencies.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.403094