Crack size and shape determination by moving magnetic field type sensor

Enokizono, Masato; Tsuchida, Yuji; Chady, Tomasz

doi:10.1109/20.706512

Cited by 16 publications

(9 citation statements)

References 9 publications

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“…Eqs. (4) and (5) indicate that the equivalent resistance R increases and the equivalent inductance L decreases due to induced eddy currents. When the excitation frequency f is high enough, an approximation for inductance L can be used in Eq.…”

Section: Eddy Current Testing Principlementioning

confidence: 98%

“…Then the measurement results including various crack information are obtained. Based on the inverse non-destructive evaluation (NDE) methods like time-frequency analysis and impedance analysis, the crack characteristics like position, size, shape, depth and extension direction can be quantitatively estimated [5,[7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the principle of electromagnetism eddy current tests can be made on all electrically conducting materials [1]. An important application of ECT is to detect surface and sub-surface cracks [2][3][4][5]. Usually the ECT sensor implements scan in 2 dimensions for test area, which is operated by an X-Y positioning system [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new differential eddy current testing sensor used for detecting crack extension direction

Huang

Zhao

2011

NDT & E International

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Section: Eddy Current Testing Principlementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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A new differential eddy current testing sensor used for detecting crack extension direction

Huang

Zhao

2011

NDT & E International

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“…The postprocessing of surface proper- [10], the estimation of defect shape [11], the detection and characterization of plural defects [12], the determination of crack size and shape [13], the determination of electrical conductivity profiles from the inversion of multifrequency data [14], eddy-current multifrequency system simulation and flaws identification [15], and to detect and identify natural flaws in steam generator tubes [16] are reported in the technical literatures. In this paper, the idea of using neural network is to develop an alternative method to replace the grid systems as discussed earlier.…”

Section: Neural Network Model Aided Post-processingmentioning

confidence: 99%

A Novel Planar Mesh-Type Microelectromagnetic Sensor—Part II: Estimation of System Properties

Mukhopadhyay

2004

IEEE Sensors J.

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The use of planar-type sensors for the estimation of system properties has gained considerable importance in recent times because of its noncontact and nondestructive nature. The impedance of a coil in proximity of any conducting/nonconducting, magnetic/nonmagnetic surface is a complex function of many parameters, such as conductivity, permeability, and permittivity of near-surface materials, liftoff and coil pitch of the coil, etc. The transfer impedance (i.e., the ratio between the sensing voltage and the exciting current) of the planar-type microelectromagnetic sensors consisting of exciting and sensing coils is used for the estimation of the near-surface system properties. Two methods have been discussed for the postprocessing of output parameters from the measured impedance data. Based on the estimation of near-surface properties, it is possible to detect the existence of defects, to predict the degradation of material, fatigue, etc.

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“…Based on the principle of electromagnetism eddy current tests can be made on all materials which are electrically conducting [1]. An important application of ECT is the detection and evaluation of surface and sub-surface cracks [2]- [5]. Usually more characters of cracks like position, size, depth, direction and shape, are evaluated by non-destructive evaluation (NDE) methods.…”

Section: Introductionmentioning

confidence: 99%

Differential eddy current testing sensor composed of double gradient winding coils for crack detection

Huang

Zhao

2010

2010 IEEE Sensors Applications Symposium (SAS)

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In this paper the eddy current testing (ECT) sensor composed of double gradient winding coils is researched to detect crack in conductive materials. The gradient winding coil has a high resolution of crack position which can reduce probability of crack undetected and advance test efficiency compared with the round coil. The novel differential configuration makes a multifunctional ECT sensor which can evaluate the characteristics of crack including position and size according to two coils' inductance variations. The data reconstruction algorithms of crack position and width are established by curve fitting method based on the least square principle, and correspondingly estimation errors are both studied. Conclusion and further work are derived on the basis of the findings.

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Crack size and shape determination by moving magnetic field type sensor

Cited by 16 publications

References 9 publications

A new differential eddy current testing sensor used for detecting crack extension direction

A new differential eddy current testing sensor used for detecting crack extension direction

A Novel Planar Mesh-Type Microelectromagnetic Sensor—Part II: Estimation of System Properties

Differential eddy current testing sensor composed of double gradient winding coils for crack detection

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