Superimposed transducer zone of testing

Polyahov, M.; Ahmedov, A.; Nikolayev, D; Chernov, L.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p485
Academic Journal
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.


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