A new ECT surface probe without lift-off noise and with phase information on flaw depth

Hoshikawa, Hiroshi; Koyama, Kiyoshi; Karasawa, H.

doi:10.1063/1.1373861

Cited by 16 publications

(15 citation statements)

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“…Experiments were conducted for Plus Probe that consists of a tangential exciting coil of 19x19mm 2 and tangential detecting coils of 7x9mm 2 . Each coil was wound with 1mm 2 cross section.…”

Section: Resultsmentioning

confidence: 99%

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A New Eddy Current Surface Probe for Short Flaws with Minimal Lift-Off Noise

Hoshikawa¹,

Koyama²,

Maëda³

2003

AIP Conference Proceedings

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The authors have devised a new eddy current surface probe that generates minimal lift-off noise and provides phase information on depth of flaws. The probe comprises a tangential exciting coil and two tangential detecting coils. The authors expect that the new probe will make eddy current testing more reliable in detecting flaws and more quantitative in evaluating depth of flaws than the conventional probes.

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Section: Resultsmentioning

confidence: 99%

“…The authors already devised a couple of eddy current surface probes with minimal lift-off noise [1][2][3]. However, @ probe reported last year [3] has a problem in evaluating short flaws.…”

Section: Introductionmentioning

confidence: 99%

A New Eddy Current Surface Probe for Short Flaws with Minimal Lift-Off Noise

Hoshikawa¹,

Koyama²,

Maëda³

2003

AIP Conference Proceedings

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“…However, in many applications eddy current measurements are adversely affected by lift-off (the distance between the probe and the test sample) variations. Improvements in the probe design [7], signal processing [8] and testing strategy [9] have been attempted to eliminate or reduce the lift-off effects. For example, a testing strategy employing dual excitation frequencies [9] was adopted with the higher frequency response for lift-off compensation.…”

Section: Introductionmentioning

confidence: 99%

A simplified model for non-destructive thickness measurement immune to the lift-off effect

Yan-ru

Cao

2011

2011 IEEE International Instrumentation and Measurement Technology Conference

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A simplified model for thickness measurement was introduced in this paper by using an electromagnetic sensor. It uses the phase signature of inductance change to reduce the lift-off effect when air-core coil is placed next to a thin nonmagnetic metallic plate. The phase signature can be extracted through the data at several frequencies. The thickness of the plate can be evaluated non-intrusively and directly. Numerical simulations were carried out for different plate thickness. The results validated the effectiveness of the proposed model when used in eddy-current testing.

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“…To achieve a high S/N ratio from the signal, a uniform eddy current (UEC) probe is used [11,12]. A UEC probe is a specially designed probe such that the configuration of the excitation coil provides UEC distribution, and the detection coils are characterized by self-differential and self-nulling features [4].…”

Section: Introductionmentioning

confidence: 99%

“…It consists of a large tangential rectangular excitation coil and a small pancake circular detection coil whose position is in the backside surface of the middle of the excitation coil. A Hoshi probe was designed to detect flaws such as cracks on the weld zone having uneven surface a nonmagnetic material [11,13]. By improving the detectability of the flaw based on further studies by Hoshikawa, a cross probe and plus probe of the UEC probe were invented.…”

Section: Introductionmentioning

confidence: 99%

Flaw Detection in Aluminum Plates Using a Rotating Uniform Eddy Current Probe with Two Pairs of Excitation Coils

Repelianto

Kasai

Sekino³

et al. 2019

Metals

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The use of eddy currents for detecting flaws in specimens is of considerable significance in the industrial sector. In this study, a new design of a rotating uniform eddy current (UEC) probe, termed the rotating butterfly probe, is presented. The probe consists of two pairs of excitation coils arranged perpendicular to each other, positioned in two layers, and in a detection coil. The excitation and detection coils were installed the pancake orientation, which provides larger induction and enhances the sensitivity of flaws detection. In addition, to generate a rotating UEC distribution with same amplitude in all directions, the number of turns between first and second layers of the excitation coils and the amplitude of excitation current were arranged. Finite element simulations were conducted to confirm that rotating UEC distribution has the same amplitude in all directions. The experiment with the rotating butterfly probe was then conducted. In the experiment, the measured results with the probe was indicated the self-differential and self-nulling properties. Moreover, the probe was successful in detecting flaws in all directions on an aluminum plate. This attribute can be used for the effective inspection of test pieces.

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A new ECT surface probe without lift-off noise and with phase information on flaw depth

Cited by 16 publications

References 0 publications

A New Eddy Current Surface Probe for Short Flaws with Minimal Lift-Off Noise

A New Eddy Current Surface Probe for Short Flaws with Minimal Lift-Off Noise

A simplified model for non-destructive thickness measurement immune to the lift-off effect

Flaw Detection in Aluminum Plates Using a Rotating Uniform Eddy Current Probe with Two Pairs of Excitation Coils

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