Study of pulse eddy current probes detecting cracks extending in all directions

Shu, Li; Huang, Songling; Zhao, Wei; Peng, Yu

doi:10.1016/j.sna.2007.07.008

Cited by 34 publications

(5 citation statements)

References 11 publications

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“…However, defects that are parallel to the inspection direction are challenging to detect as the disturbance on the magnetic field is small. [ 8 ] Eddy current testing has gained interest from a wide range of applications in conductive materials due to its ability to estimate the dimensions of defects. However, sizing of defects is possible only when the defect can be represented by a known mathematical geometry (i.e., cracks and grooves).…”

Section: Introductionmentioning

confidence: 99%

Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

Kopf

Tighe

2022

Materials & Corrosion

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Corrosion of metals can occur under coatings making early visual detection almost impossible which enables corrosion to progress undetected. Nondestructive evaluation can be used to inspect parts during their life. Thermography uses the difference in thermal properties between defective and sound areas to locate defects by applying a short pulse of heat and monitoring the surface temperature of the sample with an infrared camera. However, currently, inspection is reliant on highly trained operators to analyze images for defects and in the case of corrosion, judge its growth. The aim of this research was to develop and test a novel algorithm to identify and quantify the onset of corrosion under coatings and monitor the growth. Using this algorithm, the corrosion was autonomously detected in a variety of mild steel samples exposed to three different corrosive environments. The method successfully detected, quantified, and monitored the growth of corrosion under coatings accurately and robustly using thermal images gathered by a microbolometer infrared camera. The extent of corrosion was reported with an accuracy of 3% absolute error when compared to the true extent.

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Section: Introductionmentioning

confidence: 99%

Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

Kopf

Tighe

2022

Materials & Corrosion

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“…of applications where the coil is perpendicular to the conductor are listed below. Shu et al [9] and Janousek et al [10] both used coils perpendicular to the conductor to detect cracks in different directions and depths on the conductor with good results. Mirzaei et al [11] developed an eddy-current velocity sensor consisting of a pickup coil perpendicular to the conductor, as shown in figure 1(b).…”

Section: Introductionmentioning

confidence: 99%

A novel model for calculating the impedance of arbitrarily-shaped coils with perpendicular to the planar medium

Wu¹,

Feng²

2022

J. Phys. D: Appl. Phys.

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Some studies have shown that coils placed perpendicular to conductors have excellent detection results for specific defects in eddy-current testing (ECT), where the impedance is an important parameter. The impedance calculation for perpendicular coil is more complex than that for parallel coil, and currently the main focus is on the impedance analysis of circular and rectangular coils. In this paper a closed formula for the impedance of a coil with arbitrary-shape perpendicular to the conductor is given based on the second order vector position (SOVP) method. In the proposed model, a novel shape and position function is defined to extend the coil application to arbitrary shapes. Meanwhile, experimental comparisons are conducted to evaluate the impedance of various coils on an aluminum plate. The result illustrated that the experimental values are in perfect agreement with the calculated ones. Therefore, the proposed model can provide guidance for the impedance calculation of arbitrarily-shaped coils in eddy current testing.

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“…However, the method of generating multiple frequencies requires much more complex and expensive electronics than a single-frequency system, involving generating input signals and measuring output signals, and it is not suitable for minimizing cost or power consumption. On the other hand, the method of PEC using a pulse signal as an input has the possibility to minimize the power consumption [24,25]. Further, since it covers multiple frequencies which can detect various depths of objects without actually changing the frequency [12,26], PEC can be used as an alternative to explicit multiplefrequency methods for inspecting corrosion deep inside a steel frame.…”

Section: Introductionmentioning

confidence: 99%

Development of a Wireless Corrosion Detection System for Steel-Framed Structures Using Pulsed Eddy Currents

Lee

2021

Sensors

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Structural health monitoring (SHM) can be more efficient with the application of a wireless sensor network (WSN). However, the hardware that makes up this system should have sufficient performance to sample the data collected from the sensor in real-time situations. High-performance hardware can be used for this purpose, but is not suitable in this application because of its relatively high power consumption, high cost, large size, and so on. In this paper, an optimal remote monitoring system platform for SHM is proposed based on pulsed eddy current (PEC) that is utilized for measuring the corrosion of a steel-framed construction. A circuit to delay the PEC response based on the resistance–inductance–capacitance (RLC) combination was designed for data sampling to utilize the conventional hardware of WSN for SHM, and this approach was verified by simulations and experiments. Especially, the importance of configuring sensing modules and the WSN for remote monitoring were studied, and the PEC responses caused by the corrosion of a specimen made with steel were able to be sampled remotely using the proposed system. Therefore, we present a remote SHM system platform for diagnosing the corrosion condition of a building with a steel structure, and proving its viability with experiments.

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Study of pulse eddy current probes detecting cracks extending in all directions

Cited by 34 publications

References 11 publications

Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

A novel model for calculating the impedance of arbitrarily-shaped coils with perpendicular to the planar medium

Development of a Wireless Corrosion Detection System for Steel-Framed Structures Using Pulsed Eddy Currents

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