Conductivity Imaging in Plates Using Current Injection Tomography

Staton, Daniel J.; Rousakov, Sergei V.; Wikswo, John P.

doi:10.1007/978-1-4613-0383-1_110

Cited by 1 publication

(1 citation statement)

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“…Application of currents from two orthogonal directions and the use of phase-sensitive detection and analysis techniques allow the SQUID to be used for depth-selective, oriented eddy current imaging that can distinguish the signature of a subsurface crack from the larger signal from an adjacent rivet. For many NDE applications, the signal strength is determined by an applied field or current, and hence the signal-to-noise ratio of the image would be limited not by SQUID noise but by spatial variations in the material properties or structure of the sample (62), suggesting the possible utility of this approach for mapping subsurface heterogeneities in metals (63). The suitability of high-resolution SSMs to eddy current measurements has already been demonstrated (26,64), thus their extension to this area of study should be straightforward.…”

Section: Non-destructive Testingmentioning

confidence: 99%

Scanning Squid Microscopy

Kirtley¹,

Wikswo

1999

Annu. Rev. Mater. Sci.

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161

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The scanning SQUID microscope (SSM) is a powerful tool for imaging magnetic fields above sample surfaces. It has the advantage of high sensitivity and bandwidth and the disadvantages of relatively modest spatial resolution and the requirement of a cooled SQUID sensor. We describe the various implementations of this type of instrument and discuss a number of applications, including magnetic imaging of short circuits in integrated circuits, corrosion currents in aluminum, and trapped flux in superconductors.

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Section: Non-destructive Testingmentioning

confidence: 99%