Measurement of iron-plate thickness using HTS coil

Tomoki Ishida, Teruyoshi Sasayama, Masaaki Matsuo, Keiji Enpuku

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Eddy current testing (ECT) has been widely used for the nondestructive evaluation of metallic plates or pipes. One of the methods in ECT is to measure the change of coil impedance that is caused by the metallic plate below the coil. We applied this method to estimate the thickness of an iron plate. In this case, low-frequency measurement is required in order to avoid the skin effect. At low frequencies, however, coil resistance dominates the coil impedance, and it becomes difficult to measure small changes in coil impedance. Therefore, we applied a high-temperature superconducting (HTS) coil in order to realize low coil resistance. In the experiment, changes in inductance L and resistance R of the coil were measured when the iron plate was set at 20 mm below the HTS coil. The range of the measurement frequency was chosen from 2 to 15 Hz, and the thickness of the plate was changed from 6 to 22 mm. It was shown that changes in R were clearly related to the thickness of the iron plate. Therefore, we could determine the thickness of the iron plate. Numerical simulation using the finite element method was also performed to analyze the experimental results.

Original languageEnglish
Title of host publication2015 15th International Superconductive Electronics Conference, ISEC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467383486
DOIs
Publication statusPublished - Jan 14 2016
Event15th International Superconductive Electronics Conference, ISEC 2015 - Nagoya, Japan
Duration: Jul 6 2015Jul 9 2015

Publication series

Name2015 15th International Superconductive Electronics Conference, ISEC 2015

Other

Other15th International Superconductive Electronics Conference, ISEC 2015
CountryJapan
CityNagoya
Period7/6/157/9/15

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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Ishida, T., Sasayama, T., Matsuo, M., & Enpuku, K. (2016). Measurement of iron-plate thickness using HTS coil. In 2015 15th International Superconductive Electronics Conference, ISEC 2015 [7383469] (2015 15th International Superconductive Electronics Conference, ISEC 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISEC.2015.7383469