1,409 Hits in 4.7 sec

Low Frequency, Pulsed Eddy Currents for Deep Penetration [chapter]

William W. Ward, John C. Moulder
1998 Review of Progress in Quantitative Nondestructive Evaluation  
John Bowler for their assistance in calculating magnetic field strengths for this article.  ...  ACKNOWLEDGMENT This work is supported by the FAA Center for Aviation Systems Reliability program under Federal Aviation Administration Grant No. 95G-032. We are grateful to Dr.  ...  Figure 6 .Figure 7 . 67 Signals for simulated corrosion on the bottom of a 6.3 mm panel of 2024 Al for the GMR sensor (A) and the coil sensor (B)Scanned images using the GMR probe to detect simulated corrosion  ... 
doi:10.1007/978-1-4615-5339-7_37 fatcat:taflgndzsjdapoc36nuoasess4

Quantitative Assessment of Corrosion in Aircraft Structures Using Scanning Pulsed Eddy Current [chapter]

Jay A. Bieber, Cheng-Chi Tai, John C. Moulder
1998 Review of Progress in Quantitative Nondestructive Evaluation  
ACKNOWLEDGMENTS This work was supported by the FAA Center for Aviation Systems Reliability program at the Center for NDE at Iowa State University and was supported in part by AFOSR grant No.  ...  INTRODUCTION Eddy current nondestructive testing techniques are used extensively in industry for detection of hidden cracks and corrosion in multi-layer conductive structures such as those found in aircraft  ...  Holes were also drilled through the sample to simulate fastener holes on 25.4 mm centers. Figure 6 shows the pulsed eddy current images obtained by scanning this sample.  ... 
doi:10.1007/978-1-4615-5339-7_40 fatcat:4qfvd6sub5g6hj3ynjlvhc77nm

Detecting defects in marine structures by using eddy current infrared thermography

W. Swiderski
2016 Applied Optics  
Eddy current thermography is a new non-destructive testing technique for detecting cracks in electro conductive materials.  ...  on aircraft carriers, loads that occur upon the sudden immersion in and emerging from water in the case of submarines, effects of fatigue, corrosion cracking, etc.  ...  Structural elements of warships made of metal sheets meet the requirements of using pulsed eddy current thermography to detect defects.  ... 
doi:10.1364/ao.55.000d17 pmid:27958434 fatcat:33ucodgo4ncvlm44hndl6obe3m

Pulsed Eddy-Current Measurements of Corrosion-Induced Metal Loss: Theory and Experiment [chapter]

John C. Moulder, Mark W. Kubovich, Erol Uzal, James H. Rose
1995 Review of Progress in Quantitative Nondestructive Evaluation  
ACKNOWLEDGMENT This material is based upon work perfonned at the FAA Center for Aviation Systems Reliability operated by Iowa State University and supported by the Federal Aviation Administration under  ...  A considerable effort is underway to develop new eddy-current techniques for detecting and characterizing hidden corrosion.  ...  We have built a pulsed eddy-current instrument for characterizing corrosion-induced loss of metal in aircraft structures.  ... 
doi:10.1007/978-1-4615-1987-4_264 fatcat:y2j7dq5wy5hdzjfkzvysrl2emi

Time-Gating of Pulsed Eddy Current Signals for Defect Characterization and Discrimination in Aircraft Lap-Joints [chapter]

Jay A. Bieber, Sunil K. Shaligram, James H. Rose, John C. Moulder
1997 Review of Progress in Quantitative Nondestructive Evaluation  
Figure 8 Fig. 8 . 88 is the result of an investigation of second layer crack detection by pulsed eddy current.  ...  This demonstrates one of the principal advantages of the pulsed eddy current technique.  ... 
doi:10.1007/978-1-4615-5947-4_250 fatcat:i2ti44xxancynamhhaquy7pf64


Jia Jia, Jun Cheng, Yuanheng Zhang, Senhua Zhang, Xiaogang Li
2019 International Journal of Robotics and Automation  
A set of rust detecting system for reinforced concrete was designed based on the electromagnetic pulsed eddy current (EPEC).  ...  And the results of the numerical simulation verify the validity of the conclusions of the physical experiments.  ...  Then, the specimen generated an eddy current magnetic field under the effect of the exciting pulse magnetic field.  ... 
doi:10.2316/j.2019.206-5582 fatcat:ntlqga3po5c5hmlua4lwc2wuxe

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

Namhoon Ha, Han-Seung Lee, Songjun Lee
2021 Sensors  
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.  ...  was verified by simulations and experiments.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/s21248199 pmid:34960312 pmcid:PMC8704296 fatcat:qxfh2miqqnhdfkrnnz7ypt5gcu

Corrosion detection in steel reinforced aluminium conductor cables

Nisar Ali Jaffrey, Sujeewa Hettiwatte
2014 2014 Australasian Universities Power Engineering Conference (AUPEC)  
This paper investigates the existing methods of corrosion detection used in ACSR cables of overhead transmission lines, and estimates the location of corrosion through simulation in a computer program.  ...  The paper also analyses two promising methods of corrosion detection, namely "electromagnetic induction" and "time domain reflectometry (TDR)", and explains in detail their principle of operation and efficiency  ...  This is the basic concept for eddy current inspection [8] .  ... 
doi:10.1109/aupec.2014.6966630 fatcat:orv5whvglvbldg7pwfbfbqivje

Detection of Corrosion and Wall Thinning in Carbon Steel Pipe Covered With Insulation Using Pulsed Eddy Current

Duck-Gun Park, M.B. Kishore, J.Y. Kim, L.J. Jacobs, D.H. Lee
2016 Journal of Magnetics  
In this study we developed a Pulsed Eddy Current (PEC) system to detect wall thinning of ferro magnetic steel pipes covered with 95 mm thick fiber glass thermal insulator and shielded with aluminum plate  ...  The thickness of the tube was made to change such as 2.5 mm, 5 mm and 8 mm from the inner surface to simulate wall thinning.  ...  The duration of the eddy currents will have an effect on the transition period of the detected pulse.  ... 
doi:10.4283/jmag.2016.21.1.057 fatcat:t7lchhl2pjfzhkxkzhhik3y6fm

Review paper: Application of the Pulsed Eddy Current Technique to Inspect Pipelines of Nuclear Plants

D.G. Park, C.S. Angani, M.B. Kishore, G. Vertesy, D.H. Lee
2013 Journal of Magnetics  
In the present study, a development of pulsed eddy current (PEC) technology that detects the wall thinning of pipelines covered with insulation is reviewed.  ...  The excitation coils in the probe is driven by a rectangular current pulse, the difference of two Hall sensors has been measured as a resultant PEC signal.  ...  effect of the induced eddy currents are more on H1 than H2.  ... 
doi:10.4283/jmag.2013.18.3.342 fatcat:naxo3fl5hrbs3h3qxinz7pma54

Scanning the steel 08G2B using superminiature eddy current probe

Sergey Dmitriev, Alexey Ishkov, Vladimir Malikov, Alexander Katasonov, Alexey Grigorev, Mihail Ryasnoy, Anatoly Sagalakov, S. Kudriavtcev, V. Murgul
2020 E3S Web of Conferences  
eddy current probe to detect continuity defects and corrosion in this type of metal.  ...  The eddy current method is a non-contact one being used both for cracks identification and determination of their characteristics.  ...  eddy current probe to detect continuity defects and corrosion in this type of metal.  ... 
doi:10.1051/e3sconf/202015701011 fatcat:7mrhy6g55bezpg62v3dyt2pdwm

Investigation of an encircling Pulsed Eddy Current probe for corrosion detection

Shiva Majidnia, Rajagopal Nilavalan, John Rudlin
2014 IEEE SENSORS 2014 Proceedings  
Existing Pulsed Eddy Current probes use surface type probes on pipes.  ...  Pulsed Eddy Current (PEC) is an emerging nondestructive testing and evaluation (NDT & E) technique and has been used for a wide range of conductive materials.  ...  ACKNOWLEDGMENT Authors would like to thank TWI Ltd and College of Engineering, Design and Physical Sciences, Brunel University for funding this work.  ... 
doi:10.1109/icsens.2014.6985129 fatcat:qiowdrxyv5hxtk47ryuci3y3z4

Dual Core Differential Pulsed Eddy Current Probe to Detect the Wall Thickness Variation in an Insulated Stainless Steel Pipe

C.S. Angani, D.G. Park, C.G. Kim, P. Kollu, Y.M. Cheong
2010 Journal of Magnetics  
In the present study, a pulsed eddy current (PEC) differential probe with two excitation coils and two Hall-sensors was fabricated to measure the wall thinning in insulated pipelines.  ...  The excitation coils in the probe were driven by a rectangular current pulse, the difference of signals from two Hall-sensors was measured as the resultant PEC signal.  ...  Acknowledgement This work was developed by the research project focusing on the development of an advanced diagnostic technique for micro-material degradation and damages, as a part of a long-term nuclear  ... 
doi:10.4283/jmag.2010.15.4.204 fatcat:5l4hscvrsjbu5kv4blykxam3pi

A Capsule-Type Electromagnetic Acoustic Transducer for Fast Screening of External Corrosion in Nonmagnetic Pipes

Yong Li, Rui Cai, Bei Yan, Ilham Zainal Abidin, Haoqing Jing, Yi Wang
2018 Sensors  
Simulations based on the hybrid model indicate feasibility of the proposed transducer in detection and evaluation of external corrosion in nonmagnetic pipes.  ...  A 3D hybrid model for efficient prediction of responses from the proposed transducer to external corrosion is established.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/s18061733 pmid:29843390 pmcid:PMC6021855 fatcat:h2k6xnhgxjfwvlcpwv2pejld6q

Study on Detection Methods of Residual Wall Thickness for Process Pipeline Corrosion in Oil and Gas Gathering and Transportation Station

Mingjiang Shi, Honghui Zhao, Zhiqiang Huang, Lu Jiang
2018 Journal of Magnetics  
In this paper, it is proposed to adopt Pulsed Eddy Current (PEC) testing of coaxial double coil structure to implement the detection on residual wall thickness of pipeline corrosion in oil and gas gathering  ...  On such basis, a theoretical model of coaxial double coil structure for PEC detection is built, and the relation of voltage phase of the detected signal varying with the wall thickness of the pipeline  ...  The signals of pulse eddy current response quicker than the ones of multi-frequency current.  ... 
doi:10.4283/jmag.2018.23.2.142 fatcat:2isrcs2awzffhfg33icdnut4jm
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