Characterisation of cylindrical eddy-current probes in terms of their spatial frequency spectra

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Characterisation of cylindrical eddy-current probes in terms of their spatial frequency spectra

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Crown copyright 2001Reproduced by permission of theController of Her Majesty's Stationery Office
Published

The change in impedance of a cylindrical eddy-current coil, when placed on a layered conducting structure, is determined by the material properties and geometry of the structure and the spatial frequency spectrum of the coil. It is shown how the spatial frequency spectrum can be derived from the impedance spectrum of a coil for a characterised specimen. Once this is known, the performance of the coil can be predicted for any specimen. This process is illustrated using impedance measurements of both a large air-cored coil and a small ferrite-cored coil.

Inspec keywords: inspection; electric sensing devices; probes; eddy current testing; electric impedance measurement; coils

Other keywords: geometry; impedance spectrum; ferrite-cored coil; cylindrical eddy-current probes; impedance measurement; air-cored coil; layered conducting structure; spatial frequency spectrum; spatial frequency spectra

Subjects: Impedance and admittance measurement; Sensing devices and transducers; Materials testing; Electrical instruments and techniques; Sensing and detecting devices; Nondestructive testing: eddy current testing and related techniques

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