Results 211 to 220 of about 8,324 (257)

Invariance transformations for magnetic flux leakage signals

IEEE Transactions on Magnetics, 1996
Magnetic flux leakage (MFL) methods are used extensively for inspecting ferromagnetic materials. The analysis of the MFL signal is however fraught with problems associated with the sensitivity of the signal to a number of factors such as the MFL sensor velocity and variations in the permeability of the test specimen.
S. Mandayam, L. Udpa, S.S. Udpa, W. Lord
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Magnetic Flux Leakage for Bridge Inspection

Nondestructive Testing Methods for Civil Infrastructure, 1995
For many years the Federal Highway Administration, and before that the Bureau of Public Roads, had focused its nondestructive evaluation program on development of better tools to inspect components of steel bridges. In the early 70s the emphasis was changed and attention was given to the need for an inspection device that would detect and assess the ...
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The Effects of Magnetizer Velocity on Magnetic Flux Leakage Signals

1993
In many magnetic flux leakage applications, the nondestructive inspection constraints suggest the use of high inspection velocities. However, high inspection velocities can compromise the ability to detect and characterize defects. In general, velocity effects can be detected at speeds exceeding a few miles per hour [1].
Nestleroth, J. Bruce, Davis, Richard
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Tubing thread inspection by magnetic flux leakage

NDT & E International, 2006
Abstract The failure of the oil well tubing thread is a very serious problem which may result in accidents and repairs during well servicing. Routine inspections on the threads are thus necessary. This paper proposes a local magnetic flux leakage testing method to inspect the end of the pieces and introduces a certain kind of tubing thread testing ...
Ding Jinfeng, Kang Yihua, Wu Xinjun
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Simulation of a developed magnetic flux leakage method

Pollack Periodica, 2009
The paper presents the analysis of nondestructive testing equipment under investigation. There are two main parts of the research as well as this paper. The first part shows the present state of the developed nondestructive tester based on the Magnetic Flux Leakage method, the other part reviews the simulation and the results, which have been made with
Kovács, Gergely, Kuczmann, Miklós
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FEA of pipeline magnetic flux leakage NDE

2009 International Conference on Applied Superconductivity and Electromagnetic Devices, 2009
The magnetic flux leakage (MFL) technique is a viable approach to the non-destructive evaluation of pipelines. In this paper, we introduce two-dimensional (2D) finite element analysis (FEA) to estimate the defect profile from the pipeline MFL inspection. The 2D defect characterization would be measured by the axial and the radial components of the MFL.
Xing Li, Liang Chen, Xiaohong Zeng
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Magnetic charge model of defect in magnetic flux leakage testing

International Journal of Applied Electromagnetics and Mechanics, 2020
The defect in structures is the major risk to the structural integrity, thus to perform the defect detections and evaluations efficiently is critical in assuring the structural safety. Magnetic flux leakage testing (MFLT) is an important non-destructive testing (NDT) method.
Huang, Ranran, Li, Hongmei, Jiang, Mingyang, Wang, Yu, Zhao, Chuntian   +4 more
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The influence of magnetic head’s pose on magnetic flux leakage detection

International Journal of Applied Electromagnetics and Mechanics, 2020
As a high-sensitivity magnetic sensor, the magnetic head has been gradually applied to non-destructive testing. Compared with the single coil and the coil with an iron core, the magnetic core can converge the weak leakage magnetic field because it can form a magnetic circuit to transmit the leakage field to the coil wound thereon.
Tang, Jian, Wang, Rongbiao, Zhang, Jikai, Kang, Yihua   +3 more
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Abridgment of magnetic leakage and fringing flux calculations

Journal of the A.I.E.E., 1928
The object of this paper is the development of an empirical method of determining leakage and fringing fluxes in an electromagnetic system. Certain assumptions are made; namely, (a) the reluctance of the iron parts of the magnetic circuit are negligible as compared with that of the air-gaps; (b) the leakage and fringing components of the flux follow ...
Walter L. Upson, Ernest L. Furth
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A model for magnetic flux leakage signal predictions

Journal of Physics D: Applied Physics, 2003
An analytical model was developed to determine the length of a surface-breaking defect along the direction of the applied field when using the magnetic flux leakage (MFL) non-destructive technique. The theoretical model fits the experimental MFL results from simulated defects.
Catalin Mandache, Lynann Clapham
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