TITLE

Superimposed transducer zone of testing

AUTHOR(S)
Polyahov, M.; Ahmedov, A.; Nikolayev, D; Chernov, L.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p485
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Eddy-current transducer pick-up coil signal is determined by eddy-currents, circulating in circular area coaxial with an excitation coil. The depth of the area is determined by eddy-current propagation depth. The width of the area (b) is defined as the following: b=Rmax-Rmin, where Rmax and Rmin are radiuses at which eddy-current density=maximum density/&sqrt2;. There was created a special software to calculate eddy-current densities for superimposed excitation coil (with radius=Re) placed over flat nonmagnetic sheet at a distance of H. The results of computer emulation showed that Rmapprox. Re, where Rm-eddy-current maximum density radius, and with H=2[sup *]Re it increases to Rmapprox. 1.4[sup *]Re. The width of the circular area has a linear dependence on H:b=0.3[sup *]Re at H=0 and b=1.6[sup *]Re at H=2[sup *]Re. These results remain almost the same when considerably altering parameters of testing and the width of metal sheet, and make it possible to find the defect’s position. Moreover, eddy-current density distribution curves determine a circular zone of heating for eddy-current-thermal method of testing. © 2000 American Institute of Physics.
ACCESSION #
6029093

 

Related Articles

  • PEC: Computation of coil-induced voltage due to a defect-free plate using Stehfest's method for pulsed eddy current evaluation. Mengbao Fan; Binghua Cao; Yuqiao Wang // Insight: Non-Destructive Testing & Condition Monitoring;Jun2010, Vol. 52 Issue 6, p302 

    The pulsed eddy current technique has demonstrated considerable promise as a new tool for the evaluation of conducting plate structures. Recently, much attention has been paid to the Laplace transform-based method for the calculation of transient probe response. However, use of the Laplace...

  • Movement consideration in force calculation of a rotating magnetic bearing. Chouikhi, L.; Tibouche, A.; Bourouina, A.; Allag, H. // Electromotion;Jan-Mar2011, Vol. 18 Issue 1, p3 

    This paper presents the comparative studies between an analytical and numerical calculation of magnetic forces of a radial magnetic bearing. When an unlaminated rotor rotates in a radial magnetic bearing, eddy currents are caused to flow inside the conducting material of the rotor. These eddy...

  • Eddy currents appearing in a p- n junction in a high microwave field. Shamirzaev, S.; Gulyamov, G.; Dadamirzaev, M.; Gulyamov, A. // Semiconductors;Aug2011, Vol. 45 Issue 8, p1035 

    The influence of a high-frequency quasi-potential on the electromotive force generated by a microwave field and on eddy currents in a p- n junction has been studied. It is shown that the microwave quasi-potential reduces the eddy currents appearing in the p- n junction.

  • On the Theory of the Anisotropic Thermoelement. Anatychuk, L.; Prybyla, A. // Journal of Electronic Materials;May2011, Vol. 40 Issue 5, p1304 

    The anisotropic thermoelement (AT) has been studied in generation and cooling modes. A procedure to account for temperature dependences of material kinetic coefficients has been elaborated. The distributions of physical fields in the anisotropic thermoelement have been found. The efficiency and...

  • Influence of an Electronic Field on the GMI Effect of Fe-based Nanocrystalline Microwire. Zhang, Q.; Chen, D. L.; Li, X.; Yang, P. X.; Chu, J. H.; Zhao, Z. J. // Nano-Micro Letters;2013, Vol. 5 Issue 1, p13 

    In this work, a Fe-based nanocrystalline microwire of 20 mm in length and 25 μm in diameter was placed in the center of a 316 stainless steel pipe. The pipe was 500 μm in diameter and a little shorter than the microwire. A series of voltages were applied on the pipe to study the influence...

  • Numerical modeling of the 2D time-domain transient electromagnetic secondary field of the line source of the current excitation. Liu, Yun; Wang, Xu-Ben; Wang, Yun // Applied Geophysics: Bulletin of Chinese Geophysical Society;Jun2013, Vol. 10 Issue 2, p134 

    To effectively minimize the electromagnetic field response in the total field solution, we propose a numerical modeling method for the two-dimensional (2D) timedomain transient electromagnetic secondary field of the line source based on the DuFort-Frankel finite-difference method. In the...

  • Electromagnetic evaluation of reinforced concrete structure. Chady, T.; Frankowski, P. // AIP Conference Proceedings;Jan2013, Vol. 1511 Issue 1, p1355 

    The purpose of this paper is to present the new electromagnetic system for detection and evaluation of steel bars in reinforced concrete structures. A differential eddy current transducers and system with lock-in amplifier are proposed for this purpose. Studies show that, the shape of output...

  • Theoretical study of irreversible jumps of 180° domain well separating infinitely long domains. Roman, Andrzej // Journal of Applied Physics;1/1/1988, Vol. 63 Issue 1, p176 

    Presents an analysis of static losses due to the irreversible Barkhausen jump of the 180° Bloch wall separating infinitely large domains. Classification of relationships between the displacement of wall and time and spatial and time dependence of eddy currents generated by the jump;...

  • Advantages and limitations of eddy current displacement sensors in the measurement of standing wave ratios of transverse waves in stranded metal cables. Noiseux, Denis U.; Beauchemin, Réal // Review of Scientific Instruments;Nov85, Vol. 56 Issue 11, p2138 

    Eddy current displacement sensors have been used successfully to measure the standing wave ratios (SWR) of transverse waves in stranded metal cables. The difficult measurements are those of the minima. The effects of inclined transverse motions, longitudinal waves, and torsional waves on the...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics