Pulsed Eddy Current Thermography and Applications

Tian, GY; Wilson, John W.; Cheng, Liang; Almond, D.P.; Kostson, E.; Weekes, B.

doi:10.1007/978-3-642-21099-0_10

Cited by 30 publications

(10 citation statements)

References 15 publications

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“…The thermal transient responses during the heating and cooling stages include rich pattern information, which can be employed to evaluate crack detection and classification, and structural degradation through thermal image sequences. However, current ECPT with single line-coil excitation [ 1 , 2 , 3 ] is not good enough for complex geometry structures, e.g., gears, turbine blades, rail tracks, etc. Different configurations of ECPT are introduced and compared under different test samples.…”

Section: Theory and Methodsmentioning

confidence: 99%

“…Eddy current pulsed thermography (ECPT) [ 1 ], as an emerging nondestructive evaluation (NDE) method, has been investigated for detection and characterization of structural degradation. Material degradations and failures such as defect, fatigue, corrosion, and residual stress have been detected and evaluated using ECPT [ 2 , 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Eddy Current Pulsed Thermography with Different Excitation Configurations for Metallic Material and Defect Characterization

Tian

Gao

et al. 2016

Sensors

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This paper reviews recent developments of eddy current pulsed thermography (ECPT) for material characterization and nondestructive evaluation (NDE). Due to the fact that line-coil-based ECPT, with the limitation of non-uniform heating and a restricted view, is not suitable for complex geometry structures evaluation, Helmholtz coils and ferrite-yoke-based excitation configurations of ECPT are proposed and compared. Simulations and experiments of new ECPT configurations considering the multi-physical-phenomenon of hysteresis losses, stray losses, and eddy current heating in conjunction with uniform induction magnetic field have been conducted and implemented for ferromagnetic and non-ferromagnetic materials. These configurations of ECPT for metallic material and defect characterization are discussed and compared with conventional line-coil configuration. The results indicate that the proposed ECPT excitation configurations can be applied for different shapes of samples such as turbine blade edges and rail tracks.

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Section: Theory and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Eddy Current Pulsed Thermography with Different Excitation Configurations for Metallic Material and Defect Characterization

Tian

Gao

et al. 2016

Sensors

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“…For ease of calculation, the length of the rail is taken equal to 1 m. The calculation is given by expression (1). We will carry out the calculation for a "cracked" defect, and simulate this defect using an example of gash in a rail of various sizes [7]. The standard formula for calculating the resonant frequencies for a rod fixed from two ends is determined by the formula:…”

Section: Math Modelingmentioning

confidence: 99%

Analysis and Development of a Digital Radar Flaw Detector for Robotic Defect Detection Systems

Potylitsyn

Kokhonkova

Romanov

2019

2019 International Siberian Conference on Control and Communications (SIBCON)

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The purpose of this study is to develop a software and hardware complex for robotic defect detection systems, which will reduce the measurement time and reduce labor costs. The main method of detecting defects in this article is the registration of the effect of a change in the resonant frequency of oscillations of rail lashes due to the formation of defects. Simulation and evaluation of the effect of linear dimensions of defects for a regular cylinder and a sphere is given. It is shown that even defects with sizes up to 1 mm give frequency shifts for the first harmonic up to 10 Hz, and also data are given on the formation of additional oscillatory modes from the position of the defect relative to the edges of the rail lash. The second part of the article contains materials on the development of software and hardware for recording vibration data by a radar method Keywords-robotic system, radar method, defectoscopy, railway rails, frequency of free oscillations, acoustic waves.

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“…Alternating Current Field Measurement (ACFM) have a good potential to detect RCF cracks with maximum operating lift-off , but is not sensitive for sub surface defect and it is also difficult to identify multi-cracks [7].Electromagnetic acoustic transducers (EMATs) can generate the surface wave to detect the RCF in rail at a small standoff distance, which is a non-contact technique with high speed potential but lift-off is the limitation [8].Other noteworthy innovation include the development of low frequency eddy current (LFEC) techniques, designed to locate deep defects. This technique has the ability to penetrate the rail, along with the feature that LFEC waves are immune to longitudinal defects but are interfered with by transverse defects and the data is generated indicating the presence of transverse anomaly hidden under a horizontal crack [9].…”

mentioning

confidence: 99%

“…In addition, the continuing development of IR cameral technology has led to increase in spatial resolution, frame rate and temperature sensitivity [2]. These improvements have allowed thermography to develop from a qualitative overall inspection technique which is supplemented by other NDE technique like Pulse Eddy Current, to standalone technique able to supply quantitative information through the acquisition and analysis of image sequence [8].…”

mentioning

confidence: 99%

Eddy Current Thermography for Rail Inspection

Vaibhav¹,

Balasubramaniam²,

Thomas³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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With the tendency of the railway transportation into heavy haul, more frequent usage of rail tracks and increased axle load, the problem of surface damage and fatigue is dominant on rails. Rolling contact fatigue (RCF), which leads to crack formation in rail track heads, is becoming a growing concern in the transportation industry. It occurs on or very close to the rail head surface, and is a significant cause of rail failure. The detection of cracks in RAILS is a critical requirement in the Railway industry. Cracks, if undetected will lead to rail fractures and consequently may lead to catastrophic accidents. Thus with the development and operation of high speed trains, condition based maintenance and monitoring becomes an important approach for the improvement of reliability and safety of rail transportation. Eddy Current Thermography (ECT) is an emerging NDT method especially for conductive material like rails which combines the advantages of eddy current testing and IR Thermography. Due to electrical conductivity, thermal conductivity and high permeability of rails, ECT is very suitable for its damage detections. This technology describes an inspection methodology which utilizes scanning induction Thermography in which coil is excited by a high frequency alternating current and induced eddy current are generated in sample placed near the coil. The thermographic camera is arranged to capture data indicative of a thermal response resulting from the flow of electrical current through the copper coil which scans the rail track. A computer system is configured to process the data from the thermographic camera to generate an indication of a presence of a discontinuity in the rails.

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Pulsed Eddy Current Thermography and Applications

Cited by 30 publications

References 15 publications

Eddy Current Pulsed Thermography with Different Excitation Configurations for Metallic Material and Defect Characterization

Eddy Current Pulsed Thermography with Different Excitation Configurations for Metallic Material and Defect Characterization

Analysis and Development of a Digital Radar Flaw Detector for Robotic Defect Detection Systems

Eddy Current Thermography for Rail Inspection

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