| Autor: |
Qing Yang Steve Wu, Nan Zhang, Lim, Vincent, Lei Zhang, Yu Zhong, Russell, Benjamin, Lin Ke |
| Předmět: |
|
| Zdroj: |
ChemPhysMater; Oct2024, Vol. 3 Issue 4, p470-480, 11p |
| Abstrakt: |
Terahertz (THz) computed tomography (THz CT) exhibits the potential to provide a wealth of data, surpassing that of THz tomographic imaging in applications such as detecting embedded defects, particularly defect evolution within a glass fiber-reinforced polymer. To realize high-resolution THz CT, a systematic approach guided by wave propagation simulation was employed. First, the front wave of the THz beam was fine-tuned to realize a beam diameter of < 2 mm. To mitigate the strong refractive effect and minimize Fresnel reflection loss, a refractiveindex-matching material was fabricated and utilized as a rounded enclosure for samples with sharp corners. To further improve the reconstruction resolution, a flat surface enclosure was applied to collect all incident beams at the detector. To realize comparable results to those of full-angle CT, a limited-angle CT approach was implemented, and the frequency range 0.1-3 THz was used in the image reconstruction study. The experimental and simulated images were used to validate the findings, and conductive and non-conductive defects measuring 200 µm were successfully visualized. Additionally, a custom-built user interface enabled us to visualize the field spatial distribution of the THz beam with respect to frequency. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
