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

Hoshikawa, Hiroshi; Koyama, Kiyoshi; Maëda, Minoru

doi:10.1063/1.1570165

Cited by 8 publications

(9 citation statements)

References 2 publications

(5 reference statements)

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“…Our experimental setup is shown in Figure 3. The exciting coil (6) and the PM (8) are placed on two sides of the test sample (7). The sample is placed on a stage, and can move in one direction via the controller (2).…”

Section: Methodsmentioning

confidence: 99%

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Vector-Based Eddy-Current Testing Method

et al. 2018

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We present a type of eddy-current testing (ECT) method based on measuring the reaction of the Lorentz force by using a small permanent magnet (PM) as the probe. The means of measuring impedance is superseded by measuring force. By analyzing the variations in different components of the reaction of Lorentz force, the defects characteristics within the measured conductor can be revealed. The results indicate that the vector-based eddy-current testing method obtains good quantitative results and precisely evaluates the lift-off effect during measurement along two orthogonal directions. Numerical simulations are performed to provide supports for the experimental results. The method described in this paper may have great potential for use in industrial nondestructive testing applications.

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Section: Methodsmentioning

confidence: 99%

“…Note that a phase difference occurs between the exciting coil and pick-up coil as shown in Figure 1a,b. By identifying this signal, the defect in the test sample can be identified as well [5,6].…”

Section: Introductionmentioning

confidence: 99%

Vector-Based Eddy-Current Testing Method

et al. 2018

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“…Both detector coils are orthogonal to the excitation coil, and the large detector coils make high S/N ratio signals due to their large interaction zone. Furthermore, the measured phase signals with the probe are more resistant to lift-off noise [7].…”

Section: Uec Probe Design Modelsmentioning

confidence: 99%

“…The eddy current technique (ECT) is one of the effective non-destructive methods to detect flaws in piping and conductive plat [1,2,3,4]. Over the years, many researchers have applied ECT to detect and evaluate flaws such as cracks [5,6,7,8] on uneven surfaces such as welding zones [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

The Improvement of Flaw Detection by the Configuration of Uniform Eddy Current Probes

Repelianto

Kasai

2019

Sensors

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In this review, the principles to detect flaws with uniform eddy currents were presented based on the shape and orientation of the excitation coils and detection coils of the probe. Techniques are applied to detect flaws like cracks, especially on the weld zone surface, of test pieces of non-magnetic and ferromagnetic materials, and have unique features which are immune to the effects of lift-off. In the technique of interest, almost all the probe models developed are the type with tangential rectangular excitation coils. The induction condition and the flaw signal for each probe were discussed based on the shape and orientation of the excitation coils and detection coils of the probe. Finally, the challenge of increasing sensitivity to detect flaws with a uniform eddy current was also presented.

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“…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. The cross probe consists of a large tangential rectangular excitation coil and a large tangential rectangular detection coil, while the plus probe consists of a large tangential rectangular excitation coil and two tangential rectangular detection coils [14][15][16]. Another type, a developed tangential eddy current array probe, can provide a clear measurement signal of surface flaws despite changes in lift-off and permeability [17].…”

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

Cited by 8 publications

References 2 publications

Vector-Based Eddy-Current Testing Method

Vector-Based Eddy-Current Testing Method

The Improvement of Flaw Detection by the Configuration of Uniform Eddy Current Probes

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

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