Scanning inductive pulse phase thermography with changing scanning speed for non-destructive testing

Christoph Tuschl, Beata Oswald-Tranta, Timotheos Agathocleous, Sven Eck

Research output: Contribution to journalArticleResearchpeer-review


This work aims at non-destructive detection of surface and subsur-face defects in metallic specimens (e.g. railway track components) via pulsed inductive thermography in a moving setup. A new approach for scanning with changing speed has been developed to enable manual scanning of components in track. A steel speci-men is heated with an inductor, and the surface temperature, including its variation over time, is recorded with an infrared cam-era. The infrared sequence is evaluated by Fourier transform to phase image, in order to increase the image quality. The proposed method uses a referencing object with AprilTags visible in each frame, allowing an adjustment by image registration. Changes in velocity during the scanning process are possible, as demonstrated by a manually performed scan of the specimen and the correspond-ing evaluation. Results obtained with different infrared cameras and scanning speeds were condensed into an estimation of the max-imum scanning speed for a given camera specification.
Original languageEnglish
Pages (from-to)156-171
Number of pages16
JournalQuantitative InfraRed Thermography Journal
Issue number3
Publication statusPublished - 2 Feb 2023

Bibliographical note

Publisher Copyright: © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.


  • Inductive thermography
  • image registration
  • scanning
  • defect detection
  • Rolling contact fatigue

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