Electromagnetic Microscope for Low Frequency, Pulsed, Eddy Current Evaluation of Airframes

Podney, Walter

doi:10.1007/978-1-4615-5339-7_131

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…This means that the dynamic range of the SQUID can be devoted to flaw detection. (From SQM Technology, with permission, see [58][59][60].) by several groups concurrently, with emphasis placed on the interplay between the SQUID, the sample and the current inducing mechanism.…”

Section: The Current Induction Techniquementioning

confidence: 99%

“…Podney and Czipott proposed [57] a SQUID-based instrument with a counter-wound coil inducer for eddycurrent evaluation of materials. Several prototype systems have been constructed and characterized [58] by Podney at SQM Technology. Each uses a counter-wound excitation coil and a planar gradiometer pick-up coil, as shown in figure 12.…”

Section: The Current Induction Techniquementioning

confidence: 99%

“…Podney at SQM has produced [58][59][60] several SQUID systems for eddy-current NDE. The inducing and pick-up coil arrangements has been discussed above and vary only in size between the prototypes.…”

Section: Squid Systems For Ndementioning

confidence: 99%

“…This means that the dynamic range of the SQUID can be devoted to flaw detection. (From SQM Technology, with permission, see[58][59][60]. )…”

mentioning

confidence: 99%

“…1, The cap with pick-up and excitation coils is essentially the same as in (a); 2, a 50 cm long flexible umbilical, by which heat is transported by copper braiding inside a flexible, stainless vacuum tube; 3, SQUID housing mounted onto a Gifford-McMahon refrigerator (4); 5, a valve motor to control the expansion. (From[58] and[60] with permission. )…”

mentioning

confidence: 99%

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SQUIDs for nondestructive evaluation

Jenks

Sadeghi

Wikswo

1997

J. Phys. D: Appl. Phys.

138

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We attempt a comprehensive review of all published research in nondestructive evaluation (NDE) performed with the superconducting quantum interference device (SQUID) magnetometer since the first work was reported in the mid-1980s. The SQUID is the most sensitive detector of magnetic flux known. The energy sensitivity of the SQUID may make it the most sensitive detector of any kind. The research on SQUIDs for NDE is based on the promise of that sensitivity and on the various other desirable properties developed for SQUID instrumentation in biomagnetism and other fields. The sensitivity of SQUID instruments down to very low frequencies allows them to function as eddy-current sensors with unparalleled depth resolution, and to image the static magnetization of paramagnetic materials and the flow of near-dc corrosion currents. The wide dynamic range of the SQUID makes it possible to image defects in steel structures and to measure the magnetomechanical behaviour of ferromagnetic materials with high sensitivity. In the last decade SQUID instrumentation designed specifically for NDE has appeared and improved the spatial resolution of most work to roughly 1 mm, with promise of another order of magnitude improvement within the next five years. Algorithms for flaw detection and image deconvolution have begun to flourish. With many talented, industrious people in the field, the future of SQUID NDE looks bright, provided the crucial first niche can be found.

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Section: The Current Induction Techniquementioning

confidence: 99%

Section: The Current Induction Techniquementioning

confidence: 99%