Phase-contrast THz-CT for non-destructive testing
| Autor: | Simon Hubmer, Alexander Ploier, Sandrine van Frank, Ronny Ramlau, Peter Fosodeder, Christian Rankl |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Spectrometer Geometrical optics Terahertz radiation Image quality business.industry Phase (waves) FOS: Physical sciences Physics - Applied Physics Applied Physics (physics.app-ph) 02 engineering and technology Iterative reconstruction 021001 nanoscience & nanotechnology 01 natural sciences Signal Atomic and Molecular Physics and Optics 010309 optics Optics Nondestructive testing 0103 physical sciences 0210 nano-technology business Physics - Optics Optics (physics.optics) |
| Zdroj: | Optics Express. 29:15711 |
| ISSN: | 1094-4087 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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