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Purpose: To determine optimal frequency of the electromagnetic field that raises eddy currents during the search for surface defects in non-ferromagnetic materials or conductivity measurements by means of eddy currents methods. The frequency choice takes into consideration sensitivity of measuring device, depth of the eddy currents penetration and elimination of undesirable phenomena that affects result of the exploration. Design/methodology/approach: During the design and scalling of the devices based on phenomenon of eddy currents implying changes of contact coil impedance components, significant influence of the electromagnetic field frequency on measurement results was observed. Additionally, some other phenomena can be observed which causes invalid interpretation of devices indications. Basing on a mathematical model of a contact coil located above a conductive non-ferromagnetic plate, the sensitivities to the measured parameters are determined. Furthermore, a novel definition of the eddy currents penetration depth is proposed. Findings: Depending on specific applications, recommendations enabling proper choice of the electromagnetic field frequency are formulated. Practical implications: Describred phenomena and calculations are useful for the designers of the devices utilising the phenomenon of eddy currents, and also for the users of flaw detectors and conductometers. Remarks included in this paper can be useful for proper interpretation of the observed results and phenomena. Originality/value: A modified definition of the actual penetration depth of eddy currents proposed in the paper differs from the classical approach based on the 1/e level. This definition may be especially convenient and useful for operators utilising eddy current devices. Described sensitivity model facilitates setting up the devices for a specific task involved in a different technological process.
Wydawca
Rocznik
Tom
Strony
77--84
Opis fizyczny
Bibliogr. 16 poz.
Twórcy
autor
- Institute of Electronics, The Silesian University of Technology, ul. Akademicka 16, 44-100 Gliwice, Poland, leszek.dziczkowski@polsl.pl
Bibliografia
- [1] R. Sikora, K.M. Gawrylczuk, M. Gramaz, S. Gratkowski, Computer models of eddy-current probes in flaw detection and conductivity testing equipment, Scientific book of The Silesian University of Technology, Eddy currents in non-destruction testing Z111, Gliwice, 1993, 51-79 (in Polish).
- [2] K. Nita, P.Tarnowski, S.F. Filipowicz, Z. Giza, J. Sikora, Resistance scanner, Proceedings of the 24th International Conference on Fundamental of Electrotechnics and Circuit Theory, XXIVIC-SPETO'01, Gliwice, 2001, 523-527.
- [3] A. Lewinska-Romicka, Non-destructive testing, WNT, Warsaw, 2001 (in Polish).
- [4] L. Dziczkowski, M. Dziczkowska, A useful mathematical model for analysis of non-magnetic thin foil on the grounds of the eddy current method, Mašinostroenie i Technosfera XXI weka. Sprawnik Trudow XIV Meždunarodnoj Naučno-techničeskoj Konferencji, Donieck, 2007, 26-31.
- [5] L. Dziczkowski, The analysis of determining the conductance and thickness of thin non-magnetic foil by the eddy current method, Mašinostroenie i Technosfera XXI weka. Sprawnik Trudow XIV Meždunarodnoj Naučno-techničeskoj Konferencji, Donieck, 2007, 22-26.
- [6] L. Dziczkowski, Errors in the simultaneous determination of conductivity and foil thickness by the eddy curent method based on a single measurement, Avtomatizacja: Problemy, Idei, Rešenija, Materialy Meždunarodnoj Naučno-techničeskoj Konferencji, Sevastopol, 2007, 137-140.
- [7] M. Boujelbene, A. Moisan, W. Bouzid, S. Torbaty, Variation cutting speed the five axis milling, Journal of Achievements in Materials and Manufacturing Engineering 21/1 (2007) 7-14.
- [8] S. Malzacher, L. Dziczkowski, A comparative eddy current conductivity meter with analog reading, Scientific book of The Silesian University of Technology, Eddy currents in non-destruction testing Z111, Gliwice, 1993, 165-180 (in Polish).
- [9] R. Nowosielski, S. Griner, The shielding of magnetic fields by means of metallic glass laminar structures Fe78Si9B13,Proceedings of the 7th International Scientific Conference "Achievements in Materials and Manufacturing Engineering", AMME'98, Gliwice - Zakopane, 1998, 381-386 (in Polish).
- [10] S. Griner, R. Nowosielski, The damping of magnetic fields by metallic glass shields Co60Ni10Fe5Si11B14, Proceedings of the 8th International Scientific Conference, "Achievements in Materials and Manufacturing Engineering", AMME'99, Gliwice - Rydzyna - Pawłowice - Rokosowo, 1999, 229-232, (in Polish).
- [11] S. Griner, R. Nowosielski, The impact of the structural properties of electromagnetic fields shields mad of metallic glass Fe78Si9B13on their dumping properties, Proceedings of the 8th International Scientific Conference, "Achievements in Materials and Manufacturing Engineering", AMME'99, Gliwice - Rydzyna - Pawłowice - Rokosowo, 1999, 429-432, (in Polish).
- [12] B. Weiss, O. Biro, Multigrid for time-harmonic 3-D eddy current analysis with edge elements, IEEE Transactions on Magnetics 5 (2005) 1712-1715.
- [13] T. Theodoulidis, J. Bowler, Eddy-current interaction of long coil with a slot in a conductive plate, IEEE Transactions on Magnetics 4 (2005) 1238-1247.
- [14] K. Ishibashi, H. Fujita, Eddy Current Analysis of a Conductor With a Conductive Crack by Boundary Integral Equation Method, Proceedings of the 12th Biennial IEEE Conference on Electromagnetic Field Computation, Miami, 2006, 189-189.
- [15] G. Betta, L. Ferrigno, M. Laracca, Calibration and adjustment of an eddy current based multi-sensor probe for non-desrtuctive testing, Proceedings of the Sensors for Industry Conference, 2nd ISA/IEEE, 2002, 120-124.
- [16] K. Ishibashi, H. Fujita, Eddy Current Analysis of a konductor With a Conductive Crack by Boundary Integral Equation Method, Proceedings of the 12th Biennial IEEE Conference on Electromagnetic Field Computation, Miami, 2006, 189.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL8-0028-0042