Scanning pulse phase thermography with changing scanning speed

Tuschl, Christoph; Oswald-Tranta, Beate; Agathocleous, timotheos; Eck, Sven

doi:10.21611/qirt.2022.1020

Cited by 2 publications

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“…Inductive thermography is a standardized NDT method, which is used for detection of surface defects in metal parts 1,2 . In recent years, the usage of inductive thermography for testing railway rails and turnout sections has also been investigated [3][4][5][6] . Short pulses from an inductor heat the component by a few degrees (∆T<10 K) and an infrared camera records the changes in the surface temperature before, during and after those pulses.…”

Section: Introductionmentioning

confidence: 99%

Scanning inductive thermography using a µ-bolometer and a visual camera

Tuschl

Agathocleous

Oswald-Tranta

et al. 2023

Thermosense: Thermal Infrared Applications XLV

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Scanning inductive thermography is a non-destructive inspection technique, which is suitable for detecting surface defects in long metallic work pieces. The work piece is moved below the inductor and the infrared (IR) camera, which is recording the surface temperature during the motion. To evaluate such measurements via phase image the recorded infrared image sequence must be reorganized according to the scanning speed. If the speed is not constant during the motion (e.g., due to manual scanning), visual fiducials (AprilTags) can be used in the camera’s field of view to register shifts between consecutive images. The main contribution of this work is image fusion, applied to scanning inductive thermography, combining the results of an infrared camera and a visual camera. An uncooled IR µ-bolometer camera with a thermal time constant of 8 ms is used for the infrared spectrum. Information of the motion speed during the scanning is acquired by the image registration, and it is used to deblur the IR image sequence before the evaluation to phase image via Fourier transform is performed. A second camera records the scanning process in the visual range. Using the AprilTags for registration, a panoramic view of the specimen is created. The results from both cameras are superimposed to improve the interpretation and localization of defects.

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