Magnetic Field Mapping with a Squid Device

Fickett, F. R.; Capobianco, T. E.

doi:10.1007/978-1-4615-9421-5_45

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The reduction in the size of the search coils from that of our earlier work [1] bas been considerable and this is reflected in the turns-area product 2 (n•A) of the coils. The search coil usid previously had an n•A of 226 mm .…”

Section: Measurement Techniques and Apparatusmentioning

confidence: 73%

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Mapping of Eddy Current Probe Fields

Capobianco¹,

Fickett²,

Moulder³

1986

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Measurement Techniques and Apparatusmentioning

confidence: 73%

“…In an earlier paper we described a system that coupled a room temperature search coil to the input coil of a Superconducting Quantum Interference Device (SQUID) in liquid helium [1]. This system has been used for mapping ac magnetic fields of eddy current probes.…”

mentioning

confidence: 99%

Mapping of Eddy Current Probe Fields

Capobianco¹,

Fickett²,

Moulder³

1986

Review of Progress in Quantitative Nondestructive Evaluation

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“…In the first SQUID eddy-current instrument, Capobianco et al at the (then) National Bureau of Standards coupled a stationary rf SQUID to a room-temperature probe [50]. This group had already used a rf SQUID magnetometer to measure and map the magnetic field of eddy-current probes [51,52]. Moulder and Capobianco [53] then used the hybrid system to measure the eddy-current response of some standard simulated flaws made by electrical discharge machining (EDM) notches in a metal plate.…”

Section: The Current Induction Techniquementioning

confidence: 99%

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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“…One of the first applications of SQUIDS to measurement problems in nondestructive evaluation was the use of a SQUID magnetometer to measure and map the magnetic fields of eddy current probes [ 6 , 7 ]. The success of this application led to the development of a SQUID-based eddy current probe for flaw detection [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Detection and sizing of surface flaws with a squid-based eddy-current probe

Moulder¹,

Capobianco²

1987

J. RES. NATL. BUR. STAN.

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In a new approach to eddy current detection and sizing of surface-breaking flaws, we have coupled a conventional reflection probe to a superconducting quantum interference device (SQUID) to produce an eddy current probe with increased sensitivity and signal to noise ratio. The reflection probe consists of an air-core excitation coil surrounding two counterwound ferite-core pickup coils connected in series. A room-temperature probe is inductively coupled to a SQUID, which operates in a liquid helium bath. The new probe was used to obtain flaw signals from a number of electrical-discharge machined slots in aluminum alloy 6061. Results indicated that by scanning the probe along the length of the flaw, the length could be determined from the extent of the flaw signal. The peak amplitude of the flaw signal was found to be proportional to the cross-sectional area of the flaw. Empirical calibration curves relating these quantities were used to invert successfully the experimental data obtained for the RDM slots.

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Magnetic Field Mapping with a Squid Device

Cited by 5 publications

References 6 publications

Mapping of Eddy Current Probe Fields

Mapping of Eddy Current Probe Fields

SQUIDs for nondestructive evaluation

Detection and sizing of surface flaws with a squid-based eddy-current probe

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