Comparison of time and frequency domain features’ immunity against lift-off in pulse-compression eddy current imaging

Ferrigno, Luigi; Laracca, Marco; Malekmohammadi, Hamed; Tian, Gui Yun; Ricci, Marco

doi:10.1016/j.ndteint.2019.102152

Cited by 24 publications

(5 citation statements)

References 44 publications

(62 reference statements)

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“…Furthermore, the conductivity distributions reconstructed in the ROI by inverse methods can represent the arbitrary defect location and shape [88,152]. Through the various scanning modes shown in Figure 20, it has been proposed that among the features of |H( f , x, y)|, Arg{H( f , x, y)}, |Γ(t, x, y)|, and Arg{Γ (t, x, y)} (Γ(t, x, y) = H(t, x, y) + j{H(t, x, y)}, {•} represents the Hilbert transform) and Arg{Γ (t, x, y)} can characterize the defects in relatively deeper locations of test pieces [153]. The distribution of the measured magnetic field approximates to the Hermite-Gaussian (HG) modes which are solutions of analytical function [154], i.e., paraxial wave equations in Cartesian coordinates [155].…”

Section: Peer Review 23 Of 31mentioning

confidence: 99%

Eddy Current Measurement for Planar Structures

Xia

Huang

Chen

et al. 2022

Sensors

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Eddy current (EC) testing has become one of the most common techniques for measuring metallic planar structures in various industrial scenarios such as infrastructures, automotive, manufacturing, and chemical engineering. There has been significant progress in measuring the geometry, electromagnetic properties, and defects of metallic planar structures based on electromagnetic principles. In this review, we summarize recent developments in EC computational models, systems, algorithms, and measurement approaches for planar structures. First, the computational models including analytical models, numerical methods, and plate property estimation algorithms are introduced. Subsequently, the impedance measurement system and probes are presented. In plate measurements, sensor signals are sensitive to probe lift-off, and various algorithms for reducing the lift-off effect are reviewed. These approaches can be used for measureing thickness and electromagnetic properties. Furthermore, defect detection for metallic plates is also discussed.

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Section: Peer Review 23 Of 31mentioning

confidence: 99%

Eddy Current Measurement for Planar Structures

Xia

Huang

Chen

et al. 2022

Sensors

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“…It is currently widely used in machinery, aviation, nuclear power, etc. [1][2][3][4]. Eddy current detection is a detection technology based on the principle of electromagnetic induction.…”

Section: Introductionmentioning

confidence: 99%

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

2021

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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.

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“…PuC is extensively used in air-coupled UT [19,20], medical sonography [21,22], and for the UT inspection of high-attenuating materials [23,24]. PuC is also used in guided waves [25,26], thermography [27][28][29], and it has been also successfully applied to eddy current testing [30].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

et al. 2021

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The use of pulse-compression in ultrasonic non-destructive testing has assured, in various applications, a significant improvement in the signal-to-noise ratio. In this work, the technique is combined with linear phased array to improve the sensitivity and resolution in the ultrasonic imaging of highly attenuating and scattering materials. A series of tests were conducted on a 60 mm thick carbon fiber reinforced polymer benchmark sample with known defects using a custom-made pulse-compression-based phased array system. Sector scan and total focusing method images of the sample were obtained with the developed system and were compared with those reconstructed by using a commercial pulse-echo phased array system. While an almost identical sensitivity was found in the near field, the pulse-compression-based system surpassed the standard one in the far-field producing a more accurate imaging of the deepest defects and of the backwall of the sample.

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Comparison of time and frequency domain features’ immunity against lift-off in pulse-compression eddy current imaging

Cited by 24 publications

References 44 publications

Eddy Current Measurement for Planar Structures

Eddy Current Measurement for Planar Structures

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

Ultrasonic Imaging of Thick Carbon Fiber Reinforced Polymers through Pulse-Compression-Based Phased Array

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