The Use of Squids for Nondestructive Evaluation

Donaldson, G.B.; Cochran, A.; McKirdy, David M.

doi:10.1007/978-94-011-5674-5_15

Cited by 27 publications

(13 citation statements)

References 23 publications

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“…SQUIDs have been used for nondestructive evaluation (NDE) of various materials since the 1980s (for an overview, see, e.g., [1] and [2], and references therein). Besides testing flat samples, such as aircraft parts or niobium sheets for superconducting accelerators, the testing of thin wires has been investigated recently.…”

Section: Introductionmentioning

confidence: 99%

A SQUID-Based Nondestructive Evaluation System for Testing Wires of Arbitrary Length

Scholz

2007

IEEE Trans. Appl. Supercond.

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The high field sensitivity of superconducting quantum interference devices (SQUIDs), especially at low frequencies, makes them ideally suited for applications in nondestructive evaluation. For testing of conducting wires, such as aluminum bond wire, we developed a special cryostat, which allows for pulling a wire of arbitrary length (which is kept at room temperature) through a niobium flux transformer connected to a niobium dc SQUID. The wire is excited by either passing an alternating current through it, or by exciting eddy-currents in the wire. The cryostat is made from a stainless steel inner vessel; the outer tube is from fiberglass. The gradiometric pickup loops are wound on a German-silver tube. As the wire under test is at room temperature, thermal noise produced by the wire is limiting the sensitivity of the system, rather than thermal noise produced by the stainless steel dewar.

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Section: Introductionmentioning

confidence: 99%

A SQUID-Based Nondestructive Evaluation System for Testing Wires of Arbitrary Length

Scholz

2007

IEEE Trans. Appl. Supercond.

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“…Due to the highly sensitive magnetic flux measurements, inverse analyses on electromagnetic problems are effectively used for detecting and characterizing cracks and delamination. We shall not go into detail on the validity and applicability of each method, but will instead refer the reader to [10,11,17,19,20,23,24] for other contributions to this subject. Our initial efforts on such inverse problems include nondestructive testing under SQUID measurements using the direct current method [6].…”

Section: Introductionmentioning

confidence: 99%

Identification of material damage in two-dimensional domains using the SQUID-based nondestructive evaluation system

Banks

Kojima

2002

Inverse Problems

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Problems on the identification of two-dimensional spatial domains arising in the detection and characterization of material damage are considered. For electromagnetic nondestructive evaluation systems, observations of the magnetic flux from the front surface are used in a output least-squares approach. Parameter estimation techniques based on the method of mappings are discussed and approximation schemes are developed applying a finite-element Galerkin approach. Theoretical convergence results for computational techniques are given and results are applied to numerical experiments to demonstrate the efficacy of the proposed schemes.

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“…Since eddy currents are found only in a conducting material, the use of eddy current methods for interrogation is limited; however, these methods have been proven extremely useful when examining pipeline structures and aging aircraft. There are many devices and eddy current techniques in use today including the self-nulling eddy current probe [49] along with conformal mapping techniques [50], the magneto-optic/eddy current imager [16,45] in conjunction with eddy current imaging [17,19], the SQUID (superconducting quantum interference device) through the use of either injected current methods or induced eddy current methods [11,13,22,37,39,48] and the GMR (giant magnetoresistive) sensor based on the selfnulling probe design [51,52]. Some of the instruments provide images of the damage, while others provide quantitative data.…”

Section: Introductionmentioning

confidence: 99%

Real time computational algorithms for eddy-current-based damage detection

et al. 2002

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The Use of Squids for Nondestructive Evaluation

Cited by 27 publications

References 23 publications

A SQUID-Based Nondestructive Evaluation System for Testing Wires of Arbitrary Length

A SQUID-Based Nondestructive Evaluation System for Testing Wires of Arbitrary Length

Identification of material damage in two-dimensional domains using the SQUID-based nondestructive evaluation system

Real time computational algorithms for eddy-current-based damage detection

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