Quantitative Evaluation of Buried Defects in Ferromagnetic Steels Using DC Magnetization-Based Eddy Current Array Testing

Li, Erlong; Wu, Jianbo; Zhu, Junzhen; Kang, Yihua

doi:10.1109/tmag.2020.3003841

Cited by 16 publications

(9 citation statements)

References 26 publications

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“…Under DC magnetization, the conductivity effect is found to be negligible and the real part of the impedance can, therefore, be ignored for the sensor optimization study [22,26].…”

Section: 𝑅 = 𝑙 𝜇𝐴mentioning

confidence: 99%

“…With the development of powerful rare earth magnets, there is the possibility of using the MFL or MEC sensors as permanently installed sensors due to considerably reduced probe size and low power requirements. The magnetic eddy current method, which is an adaptation of magnetic flux leakage and eddy current technique, requires low magnetization levels and has good sensitivity for detecting internal corrosion in ferromagnetic structures [22,23]. Additionally, the technique has the capability to distinguish between internal and external corrosion, which is not possible with the traditional MFL [24].…”

Section: Introductionmentioning

confidence: 99%

“…MEC sensors have been found to be promising for the detection of narrow-surface and buried defects such as cracks by measuring the perturbations in the permeability of the test sample [25][26][27]. Most of the research on MEC sensors has focused on the effect of the magnetization level and defect quantification using different signal parameters [22][23][24]. A wide range of detection frequencies are used for MEC testing.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of Permanently Installed Magnetic Eddy Current Sensor for Corrosion Monitoring of Ferromagnetic Pipelines

et al. 2022

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Permanently installed sensors are a cost-effective solution for corrosion monitoring due to their advantages, such as less human interference and continuous data acquisition. Some of the most widely used permanently installed corrosion sensors are ultrasonic thickness (UT) gauges. However, UT sensors are limited by the need for coupling agents between pipe surfaces and sensors. The magnetic eddy current (MEC) method, on the other hand, does not require couplant and can be used over insulations. With the development of powerful rare earth magnets, MEC sensors with low power consumption are possible, and there is the prospect of using them as permanently installed sensors. A novel wireless magnetic eddy current sensor has been designed and optimized using finite element simulation. Sensitivity studies of the sensors reveal that the excitation frequency is a critical parameter for the detection of corrosion defects. An in-depth explanation of the relationship between the sensitivity of the sensor and the excitation frequency is presented in this paper. The results of an accelerated corrosion test, conducted to simulate the service environment of the sensor, are also discussed. It was observed that the sensor signals are very sensitive to corrosion defects and show no subtle differences due to temperature and humidity changes.

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“…Under DC magnetization, the conductivity effect is found to be negligible and the real part of the impedance can, therefore, be ignored for the sensor optimization study [22,26].…”

Section: 𝑅 = 𝑙 𝜇𝐴mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Permanently Installed Magnetic Eddy Current Sensor for Corrosion Monitoring of Ferromagnetic Pipelines

et al. 2022

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“…The MEC technique is an adaptation of MFL and can be used along with the MFL transducer for corrosion monitoring. While the performance of MFL and MEC methods for detection of corrosion through inspection is well established [ 30 , 40 ], the monitoring devices designed based on the MFL technique are not being tested for long-term performance in the service environment. An improvement in their reliability is required for long-term monitoring applications [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

Reliability Improvement of Magnetic Corrosion Monitor for Long-Term Applications

Wasif

Tokhi

Rudlin

et al. 2023

Sensors

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Electromagnetic techniques are widely employed for corrosion detection, and their performance for inspection of corrosion is well established. However, limited work is carried out on the development and reliability of smart corrosion monitoring devices for tracking internal or buried thickness loss due to corrosion remotely. A novel smart magnetic corrosion transducer is developed for long-term monitoring of thickness loss due to corrosion at critical locations. The reliability of the transducer is enhanced by using a dissimilar active redundancy approach. The improved corrosion monitor has been tested in the ambient environment for seven months to evaluate the stability against environmental factors and degradation. The monitor is found to show great sensitivity to detect defects due to corrosion. Detection of anomalous patterns in the time series data received from the monitors is accomplished by using Pearson’s correlation coefficient. The critical component of the monitor is identified at the end of the test. Research findings reveal that, compared to the existing corrosion monitoring techniques in the industry, the detection and isolation of faulty sensor features introduced in this study can contribute to reliable monitoring of thickness loss due to corrosion in ferromagnetic structures over an extended period of time.

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“…ECT is also a contact testing method, and it can be easily affected by non-uniform permeability [14,15]. To sum up, these testing methods still have some shortcomings for bearing rings.…”

Section: Introductionmentioning

confidence: 99%

Scanning Induction Thermography for Bearing Ring Under AC-DC Composite Magnetization

Jiang

Zhang

et al. 2022

J Nondestruct Eval

Self Cite

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Induction thermography is a promising nondestructive testing technique with the advantages of high efficiency, lift-off tolerance, and defect imaging. To fulfill scanning detection and quantify the defect in bearing rings, this paper proposes scanning eddy current thermography under AC-DC composite magnetization. With DC magnetization, the defect will cause permeability disturbance in the bearing ring surface. Under high-frequency AC magnetization, disturbed permeability will generate a non-uniform thermal response captured by the infrared camera. To investigate the detection principle, a multi-physics coupling simulation model for permeability and thermal distribution in the scanning process is built, involving DC-AC composite magnetization, nonlinear ferromagnetic material, heat generation, heat conduction, and scanning movement. Then, a thermal data postprocessing method for scanning imaging and crack quantification is proposed. Finally, the scanning induction thermography system for bearing rings is designed and developed. The experimental results show that the proposed scanning method can quantify bearing ring cracks with depths up to 2.0 mm.

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Quantitative Evaluation of Buried Defects in Ferromagnetic Steels Using DC Magnetization-Based Eddy Current Array Testing

Cited by 16 publications

References 26 publications

Development of Permanently Installed Magnetic Eddy Current Sensor for Corrosion Monitoring of Ferromagnetic Pipelines

Development of Permanently Installed Magnetic Eddy Current Sensor for Corrosion Monitoring of Ferromagnetic Pipelines

Reliability Improvement of Magnetic Corrosion Monitor for Long-Term Applications

Scanning Induction Thermography for Bearing Ring Under AC-DC Composite Magnetization

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