Phase-contrast THz-CT for non-destructive testing.

Area of Science:

• Physics
• Materials Science
• Engineering

Background:

• Terahertz computed tomography (THz-CT) is an imaging technique with potential for non-destructive testing.
• Traditional THz-CT methods can face challenges in image quality and reconstruction speed.
• Phase information in THz signals is crucial for accurate material characterization.

Purpose of the Study:

• To develop a new image reconstruction approach for THz-CT.
• To introduce a novel algorithm for extracting average phase from THz signals.
• To validate the approach for non-destructive testing of plastic profiles.

Main Methods:

• A geometrical optics model incorporating THz signal amplitude and phase was utilized.
• A novel algorithm was derived to extract average phase from measured THz signals.
• THz time-domain spectroscopy (THz-TDS) in transmission geometry was employed for rapid CT measurements.

Main Results:

• The developed algorithm successfully generated phase-contrast sinograms.
• Phase-contrast sinograms were effectively used for image reconstruction.
• Quantitative evaluation demonstrated the potential of the approach for plastic profile analysis.

Conclusions:

• The new THz-CT image reconstruction method offers improved phase extraction.
• The approach enables rapid and effective non-destructive testing of plastic profiles.
• This technique has significant implications for quality control in materials science and engineering.