Detection of subsurface cracks using inductive thermography

Beate Oswald-Tranta; Christoph Tuschl; Alexander Hackl

doi:10.1117/12.2585623

12 April 2021 Detection of subsurface cracks using inductive thermography

Beate Oswald-Tranta, Christoph Tuschl, Alexander Hackl

Proceedings Volume 11743, Thermosense: Thermal Infrared Applications XLIII; 117430G (2021) https://doi.org/10.1117/12.2585623
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

Inductive thermography is a well-established NDT method to detect surface cracks in metallic materials. The induced eddy current density decays exponentially below the surface, penetrating up to the so-called skin-depth. This depth depends on the excitation frequency and on material parameters, as the magnetic permeability. As a surface crack is an obstacle for the eddy current and for the heat flow, it becomes visible in the infrared images. It is investigated whether cracks ending below the surface, can be detected by inductive thermography. It is stated, that when the crack end is lying closer the surface than the half skin-depth, then it can be detected. This statement is investigated for ferro-magnetic and non-magnetic samples and for different excitation frequencies. The inspection is usually done in reflection mode, but for thin wall work-pieces the transmission mode provides a good detection possibility. Experimental results are compared with finite element simulation results.

Conference Presentation

Citation Download Citation

Beate Oswald-Tranta, Christoph Tuschl, and Alexander Hackl "Detection of subsurface cracks using inductive thermography", Proc. SPIE 11743, Thermosense: Thermal Infrared Applications XLIII, 117430G (12 April 2021); https://doi.org/10.1117/12.2585623

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