Skip to main content
Article thumbnail
Location of Repository

Eddy current measurement of the electrical conductivity and porosity of metal foams.

By Xiandong Ma and A. J. Peyton


This paper presents experimental results characterizing the electrical properties of metallic foams, a relatively new class of material, using nondestructive eddy current sensing techniques. The fundamentals of eddy current sensing, which is based on electromagnetic induction, are described, and the effects on coil impedance change of the representative types of coil sensors are analyzed. It has been found that the phase-frequency response of the normalized eddy current signal of the sensor is relatively immune to coil-to-sample spacing and fill-factor variations, from which key results such as the equivalent conductivity and the porosity of the foams are presented. The paper demonstrates the broad applicability of this technique in characterizing and further recognizing the properties of a variety of sample shapes used

Year: 2006
OAI identifier:
Provided by: Lancaster E-Prints

Suggested articles


  1. (1988). A single-sided eddy current method to measure electrical resistivity,”
  2. (1968). Analytical solutions to eddy-current probecoil problems,”
  3. (2002). Determination of the thickness of copper coatings on steel by measuring the impedance of a thin elliptic coil,”
  4. (1996). Eddy current measurement of the wall thickness and conductivity of circular nonmagnetic conductive tubes,”
  5. (1971). Introduction to Electromagnetic Non-Destructive Test Methods.
  6. (2001). Manufacture, characterisation and application of cellular metals and metal foams,”
  7. (1986). Peyton received the B.Sc. degree in electrical engineering and electronics and the Ph.D. degree in medical instrumention from the
  8. (2003). The FOAMCARP process: Foaming of aluminium MMCs by the chalk-aluminium reaction in precursors,”
  9. (2003). The microstructure and electrical conductivity of aluminum alloy foams,”
  10. (1989). to 1998, he was an Electrical Engineer for eight years and later a Senior Engineer for two years at NARI, where he specialized in DSP-based power system real-time digital simulators dedicated for close-loop power equipment testing. From
  11. (1986). Xiandong Ma received the B.Eng. degree in electrical engineering from Jiangsu University of Science and Technology,
  12. (1989). Xiandong Ma received the B.Eng. degree in electrical engineering from Jiangsu University of Science and Technology, China, in 1986, the M.Sc. degree in power systems and automation from Nanjing Automation Research Institute

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.