Terahertz imaging super-resolution for documental heritage diagnostics
IEEE Transactions on Terahertz Science and Technology(2024)
摘要
Terahertz imaging provides valuable insights into the composition and
structure of objects or materials, with applications spanning security
screening, medical imaging, materials science, and cultural heritage
preservation. Despite its widespread utility, traditional terahertz imaging is
limited in spatial resolution to approximately 1 mm according to Abbe's
formula. In this paper, we propose a novel super-resolution method for
terahertz time-domain spectroscopy systems. Our approach involves spatial
filtering through scattering in the far-field of high spatial frequency
components of the imaged sample. This method leverages evanescent wave
filtering using a knife edge, akin to a standard structured illumination
scheme. We demonstrate improved spatial resolution in slit diffraction, edge
imaging, and reflection imaging of structures fabricated on a paper substrate
using commonly encountered materials in works of art and documents.
Furthermore, we present super-resolved images of an ancient document on
parchment, showcasing the effectiveness of our proposed method.
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关键词
Terahertz (THz) imaging,THz time-domain spectroscopy,optical super-resolution,documental heritage,non-invasive diagnosis
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