Pulsed eddy current testing of carbon steel pipes' wall-thinning through insulation and cladding

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

Pulsed eddy current testing of wall-thinning through cladding and insulation was studied from both theoretical and experimental aspects. The analytical solution was derived for a simplified four-layered structure and was used to conduct simulations to ascertain the feasibility of this method. A pulsed eddy current testing probe consisting of a circular excitation coil and an AMR-sensor-embedded differential detector was fabricated to measure the time-varying magnetic field signals on the axisymmetric excitation coil's axis. The measurement system was able to measure magnetic field down to a few hundred micro-Gausses in an unshielded environment. Simulation and test results showed that over a certain time after turning off the excitation current the magnetic field signal's decay behavior is almost merely relevant to the pipe's wall thickness. Future development of a carbon steel pipe's wall-thinning can be evaluated by using decay coefficients estimated from previously obtained test data.

Original languageEnglish
Pages (from-to)215-224
Number of pages10
JournalJournal of Nondestructive Evaluation
Volume31
Issue number3
DOIs
Publication statusPublished - 2012 Sep 1
Externally publishedYes

Keywords

  • AMR sensor
  • Analytical solution
  • Magnetic field measurement
  • Pulsed eddy current testing
  • Wall-thinning

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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