Phase-contrast THz-CT for non-destructive testing

Alexander Ploier; Christian Rankl; Peter Fosodeder; Ronny Ramlau; Sandrine van Frank; Simon Hubmer

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arxiv 2102.08650 v2 pith:D3GGKNEN submitted 2021-02-17 physics.app-ph physics.optics

Phase-contrast THz-CT for non-destructive testing

Peter Fosodeder , Simon Hubmer , Alexander Ploier , Ronny Ramlau , Sandrine van Frank , Christian Rankl This is my paper

classification physics.app-ph physics.optics

keywords algorithmapproachimagenon-destructivephasephase-contrastplasticprofiles

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A new approach for image reconstruction in THz computed tomography (THz-CT) is presented. Based on a geometrical optics model containing the THz signal amplitude and phase, a novel algorithm for extracting an average phase from the measured THz signals is derived. Applying the algorithm results in a phase-contrast sinogram, which is further used for image reconstruction. For experimental validation, a fast THz time-domain spectrometer (THz-TDS) in transmission geometry is employed, enabling CT measurements within several minutes. Quantitative evaluation of reconstructed 3D printed plastic profiles reveals the potential of our approach in non-destructive testing of plastic profiles.

Phase-contrast THz-CT for non-destructive testing

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