Eddy current tomography of multi-layered aluminum structures

Chady, T.; Enokizono, M.; Todaka, T.; Tsuchida, Y.; Sikora, R.; Anan, M.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p425
Academic Journal
This paper proposes a high resolution ECT system for testing of multi-layered aluminum structures. In this system a precise crack imaging is achieved by using spectrograms obtained from the eddy-current probe multifrequency response. A complex signal containing selected sinusoidal components is used as excitation. Selected methods of digital signal processing are used and finally the results are obtained in a form of spectrograms. The spectrogram is a two-dimensional display of the relative amplitude of the frequency components of a signal from the pickup coil over the sensor position. By using the spectrogram it is possible to determine position and shape of flaws. The determination of an unknown defect size, shape, and position from eddy-current probe response is an inverse problem. To solve this problem authors have successfully applied a newly developed neural network model. In order to demonstrate advantages of the system a set of experiments was carried out. Each specimen consists of five 1 mm thick plates of aluminum. The flaws are wholes of diameter from 0.5 mm up to 4 mm made in single layers. Various kinds of flaw configurations were tested. The results of experiments confirm very good spatial resolution of the system. © 2000 American Institute of Physics.


Related Articles

  • Spectroscopic properties of Ho3+/Yb3+ codoped lanthanum aluminum germanate glasses with efficient energy transfer. Zhang, Qiang; Chen, Guorong; Zhang, Guang; Qiu, Jianrong; Chen, Danping // Journal of Applied Physics;Dec2009, Vol. 106 Issue 11, p113102 

    Ho3+/Yb3+ codoped lanthanum aluminum germanate glasses are prepared simply by melt-quenching method. The 2 μm emission characteristic and energy transfer from Yb3+ to Ho3+ upon excitation of a conventional 980 nm laser diode is investigated and the energy transfer efficiency is as high as...

  • Soft X-Ray Radiation of Fast-Capillary-Discharge CAPEX 2. Schmidt, Jiri; Kolacek, Karel; Bohacek, Vladislav; Ripa, Milan; Frolov, Olexandr; Vrba, Pavel; Jancarek, Alexandr; Vrbova, Miroslava // AIP Conference Proceedings;2002, Vol. 651 Issue 1, p165 

    The paper reports on technological modifications of the capillary discharge experiment CAPEX, especially in capillary region. A temporal evolution of axial soft X-ray radiation and a spectroscopic measurement in the soft X-ray region on the modified capillary are presented as well. The strong...

  • Collision induced deactivation of the bending mode v=1 vibrational level of the excited A... Chieu Nguyen Xuan; Margani, Alessandro; Mastropietro, Marcello // Journal of Chemical Physics;5/22/1997, Vol. 106 Issue 20, p8473 

    Studies collisional deactivation of the vibrational level of the bending mode by rare gases for the excited and ground electronic states of PH2. Quenching constants; Role of rotation with respect to translation in the deactivation of vibrational energies; Behavior of dihydride triatomic...

  • Improvement of two-photon laser induced fluorescence measurements of H- and O-atoms in premixed methane/air flames. Gasnot, L.; Desgroux, P.; Pauwels, J.F.; Sochet, L.R. // Applied Physics B: Lasers & Optics;1997, Vol. 65 Issue 4/5, p639 

    Two-photon LIF is used to measure the concentration of H- and O-atom in low–pressure premixed methane/air flames at different equivalence ratios. New experimental evidences of photochemical effects, interference and collisional energy transfer upon excitation at 205 and 226 nm are shown....

  • Impact induced vibrational excitation in surface scattering of hyperthermal neutral C[sub 60]... Tsipinyuk, B.; Budrevich, A. // Journal of Chemical Physics;2/8/1997, Vol. 106 Issue 6, p2449 

    Presents a mass-spectrometry based method for measuring the average vibrational energy of large and hot polyatomic molecules. Application to carbon molecules inelastically scattered off nickel; Measurement of vibrational cooling and collisional excitation upon surface impact.

  • Isotope effects in the vibrational deactivation of large molecules. Toselli, Beatriz M.; Barker, John R. // Journal of Chemical Physics;8/1/1992, Vol. 97 Issue 3, p1809 

    Collisional deactivation of highly vibrationally excited gas phase toluene-d8 and benzene-d6 pumped at 248 nm, has been investigated by monitoring the time resolved infrared fluorescence from the C–D stretch modes near 4.3 μm. For toluene-d8, energy transfer data were obtained for...

  • Ionic excitation in dense, two-component plasmas: A nonperturbative approach. Kitamura, Hikaru; Murillo, Michael S.; Weisheit, Jon C. // Physics of Plasmas;Aug2000, Vol. 7 Issue 8 

    A nonperturbative formulation of atomic collisional excitation rates in dense plasmas is developed on the basis of the equations of motion for density matrices in a stochastic potential. This model treats the strong scattering between the atom and plasma particles through the many-body...

  • Orange and red upconversion laser pumped by an avalanche mechanism in Pr[sup 3+], Yb[sup 3+]:BaY[sub 2]F[sub 8]. Osiac, E.; Heumann, E.; Huber, G.; Kück, S.; Sani, E.; Toncelli, A.; Tonelli, M. // Applied Physics Letters;6/2/2003, Vol. 82 Issue 22, p3832 

    The letter reports on upconverted orange (607.5 nm, [sup 3]P[sub 0]→[sup 3]H[sub 6]) and red (638.7 nm, [sup 3]P[sub 0]→[sup 3]F[sub 2]) laser oscillation at room temperature observed in Pr[sup 3+], Yb[sup 3+]:BaY[sub 2]F[sub 8] under excitation at 822 or 841 nm at 300 K. The...

  • Microcalorimetry of dust particles in a radio-frequency plasma. Swinkels, G.H.P.M. // Journal of Applied Physics;8/15/2000, Vol. 88 Issue 4, p1747 

    Details the microcalorimetry of rhodamine B-dyed dust particles in radio-frequency (rf) plasma. Use of argon-ion laser to excite the dye; Determination of temperature after comparing with calibration curves; Relationship between rf power and particle temperature in oxygen and argon.


Read the Article


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

Try another library?
Sign out of this library

Other Topics