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

Xu, Peng; Huang, Songling; Zhao, Wei

doi:10.1016/j.ndteint.2011.01.010

Cited by 21 publications

(4 citation statements)

References 24 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The schematic representation of the test coils is shown in Figure 5. The eddy current principle can be explained by the following electromagnetic equations [42]:…”

Section: Mechanism Of Eddy Current Testingmentioning

confidence: 99%

Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

Guo

Ren

Zhang

2021

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

New materials and manufacturing technologies require applicable non-destructive techniques for quality assurance so as to achieve better performance. This study comprehensively investigated the effect of influencing factors including excitation frequency, lift-off distance, defect depth and size, residual heat, and surface roughness on the defect EC signals of an Inconel 738LC alloy produced by selective laser melting (SLM). The experimental investigations recorded the impedance amplitude and phase angle of EC signals for each defect to explore the feasibility of detecting subsurface defects by merely analyzing these two key indicators. Overall, this study revealed preliminary qualitative and roughly quantitative relationships between influencing factors and corresponding EC signals, which provided a practical reference on how to quantitively inspect subsurface defects using eddy current testing (ECT) on SLMed parts, and also made solid progress toward on-line ECT in additive/subtractive hybrid manufacturing (ASHM) for fabricating SLMed parts with enhanced quality and better performance.

show abstract

“…The schematic representation of the test coils is shown in Figure 5. The eddy current principle can be explained by the following electromagnetic equations [42]:…”

Section: Mechanism Of Eddy Current Testingmentioning

confidence: 99%

Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

Guo

Ren

Zhang

2021

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Eddy current detection is a detection technology based on the principle of electromagnetic induction. When a sensor (coil) scans a ferromagnetic conductive material, the defect will cause the sensor to change its impedance to detect the defect [5].…”

Section: Introductionmentioning

confidence: 99%

Multi-Channel Eddy Current Detector Based on Virtual Instrument Technology and Self-Balancing Technology

2021

View full text Add to dashboard Cite

In order to reduce the complexity of software and hardware design in multi-channel eddy current testing, a multi-channel real-time eddy current testing system based on lock-in amplifier technology and self-balancing technology is designed. The system uses graphical programming language platform (LabVIEW), Myrio1900 data acquisition control card and lock-in amplifier as key components. The lock-in amplifier adopts the lock-in technology to detect the amplitude and phase of the weak eddy current signal. The Myrio1900 card outputs multiple analog switch control signals and collects the amplitude component of the weak eddy current signal. The LabVIEW platform uses self-balancing technology to eliminate the imbalance of the bridge itself. The detection system realizes the real-time and reliable display of the amplitude and XY components of the 6-channel eddy current signal. Experimental results show that the designed system has a detection width of 56.00 mm at one time, and can detect artificial grooves with a covering layer of 2.90 mm. The artificial grooves have a width of 1.00 mm, a depth of 1.00 mm and a length of 50.00 mm. The system design process described in the article can be used as a reference for equipment developers and can also be used for educational purposes.

show abstract

“…The main advantage of Eddy current is its range of inspections and measurements which covers the crack detection [1,2], material and coating thickness measurement [3][4][5], conductivity measurement for material identification [6,7], heat damage detection, case depth determination, and heat treatment monitoring [8]. It offers numerous advantages such as high sensitivity, rapid scanning, and flexibility which contributed to its broad utilization.…”

Section: Introductionmentioning

confidence: 99%

Defect Characterization Based on Eddy Current Technique: Technical Review

Ghoni

Dollah

Sulaiman

et al. 2014

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Eddy current testing is widely used for nondestructive evaluation of metallic structures in characterizing numerous types of defects occurring in various locations. It offers remarkable advantages over other nondestructive techniques because of its ease of implementation. This paper presents a technical review of Eddy current technique in various scope of defect detection. The first part presents Eddy current evaluation on various defects location and orientation such as steam generator tubes, stress crack corrosion, and fatigue cracks. The next section analyzes the use of pulsed Eddy current and pulsed Eddy current thermography as an alternative method for monitoring the growth of cracks with the aid of computational techniques for postsignal analysis.

show abstract

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

Cited by 21 publications

References 24 publications

Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

Multi-Channel Eddy Current Detector Based on Virtual Instrument Technology and Self-Balancing Technology

Defect Characterization Based on Eddy Current Technique: Technical Review

Contact Info

Product

Resources

About