Multi sensor probe and defect classification in eddy current tubing inspection

Joubert, Pierre-Yves; Bihan, Yann Le

doi:10.1016/j.sna.2005.09.038

Cited by 14 publications

(6 citation statements)

References 5 publications

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“…Once micro damage exists in the structure's surface, the material properties will change, which will result in a small change in the inductive voltages of the secondary coils. Thus, the change of the material properties can be identified by measuring the change in the multi-channel transimpedances of the planar electromagnetic sensor array, and then the micro damage on the surface of the metal structures can be found [11,12]. The repeatability of the amplitude and the phase of transimpedance measurements are of more concern in NDT, rather than the measurement accuracy, as in other cases.…”

Section: Multi-channel Transimpedance Measurement Of a Planar Electro...mentioning

confidence: 99%

Multi-channel transimpedance measurement of a planar electromagnetic sensor array

Chen¹,

Xie²,

Zhou³

et al. 2015

Meas. Sci. Technol.

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Planar electromagnetic sensor arrays have advantages such as nice coherence, fast response speed and high sensitivity, which can be used for micro damage inspection of crucial parts in equipment, and the key point in improving the inspection performance is to achieve a precise measurement of multi-channel transimpedances (the inductive voltages divided by the exciting current of the sensor). The principle and characteristics of planar electromagnetic sensor arrays are introduced in this paper, and a digital lock-in impedance measurement algorithm was investigated, with which the interference and noise in inductive voltage signals can be restrained effectively and the amplitude and phase of the transimpedance can be obtained with good repeatability. An eight channel impedance measurement system was established based on a field programmable gate array and utilized to inspect the micro damage in metal materials, and the experimental data were analyzed. The experimental results show that the impedance measurement has excellent repeatability when the sensor array is placed in air, and the maximum measurement error of the complete transimpedance measurement system is lower than 10%. A micro crack with a size of 1 mm (length) × 0.1 mm (width) × 1 mm (depth) can be detected through the measurement of multi-channel transimpedance in the planar electromagnetic sensor array.

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Section: Multi-channel Transimpedance Measurement Of a Planar Electro...mentioning

confidence: 99%

Multi-channel transimpedance measurement of a planar electromagnetic sensor array

Chen¹,

Xie²,

Zhou³

et al. 2015

Meas. Sci. Technol.

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“…This arrangement was chosen so that the EC flow perpendicularly to the main direction (z) of the defects ( Fig. 1) in order to maximize the probe sensitivity [3]. In presence of a defect, due to the local deviation of the EC, the B z axial component of the magnetic flux density is modified and nonzero B r radial and B  azimutal components appear in the vicinity of the defect.…”

Section: Problem Description and Proposed Generic Probe Structurementioning

confidence: 99%

Study for the Design of an Eddy Current Array Probe for the Imaging of Aeronautical Fastener Holes

Thomas¹,

Joubert²,

Vourch³

2009

Sen Lett

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Abstract:The design of an eddy current imaging array probe dedicated to the inspection of aeronautical fastener holes is presented. The probe aims at enhancing the characterisation of defects such as surface fatigue cracks as well as at simplifying the inspection procedures (limited probe displacements). In this paper, a general probe design featuring separate inducing and sensing functions is proposed and studied thanks to 3D finite element computations. Then, a first experimental validation of the structure is given. Finally alternative pickup sensor technologies are considered. A quantitative study of the influence of both the nature of the used sensors and their arrangement as part of a multisensor array is proposed and discussed.

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“…Non destructive testing has an important role in the evaluation of the integrity of oleo-ducts, aircrafts [1], pressurized gas pipes [2] and nuclear central equipments. The need for these non destructive tests by industrial applications has led to the development of several technologies that allow the analysis and detection of material defects caused by stress or corrosion, without changing the properties of the materials.…”

Section: Introductionmentioning

confidence: 99%

Current around a crack in an aluminum plate under nondestructive evaluation inspection

Ribeiro

Ramos

Pasadas

et al. 2012

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings

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This paper presents an inversion problem algorithm applied in eddy current inspection using a sinusoidal magnetic field with fixed-amplitude, in a metallic plate sample with machined crack defects. The uniform magnetic field is obtained in a wide area around the probe due to the building technique of the excitation coil. The magnetic sensor in use is a giant magnetoresistance (GMR) with high sensibility. It measures the amplitude and phase of the magnetic field originated from eddy currents. A perturbation occurs in the measured magnetic field in the proximity of a crack defect. The current density is then determined around the crack defect through an inversion problem algorithm. The applied method consists in determining the transformation kernel and applying a Tikhonov regularization algorithm. With this data it is possible to obtain information about the defect geometrical characteristics.

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Multi sensor probe and defect classification in eddy current tubing inspection

Cited by 14 publications

References 5 publications

Multi-channel transimpedance measurement of a planar electromagnetic sensor array

Multi-channel transimpedance measurement of a planar electromagnetic sensor array

Study for the Design of an Eddy Current Array Probe for the Imaging of Aeronautical Fastener Holes

Current around a crack in an aluminum plate under nondestructive evaluation inspection

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