Abstract
Terahertz (THz) technology offers unique see-through imaging capability for various non-destructive inspection applications. In this work, we implemented a broadband continuous-wave THz imaging system to study technical issues related to the see-through imaging, including frequency-dependent resolution, material loss, and interference-induced artifacts. The interference-induced false contrast and artifacts were observed, which were suppressed by broadband imaging techniques adopting the homodyne signal amplification by interferometric setup to overcome the material loss.
Highlights
Terahertz (THz) wave permits unique “see-through” imaging of optically opaque objects that are made of non-metallic materials such as plastics and ceramics [1]
While various real-time THz imaging systems have been realized by using high-power, single-frequency THz emitters, significant interference fringes can appear
To overcome the material loss and the problems related to the interference artifacts, we propose a homodyne amplification technique combined with broadband imaging
Summary
Terahertz (THz) wave permits unique “see-through” imaging of optically opaque objects that are made of non-metallic materials such as plastics and ceramics [1] This unique aspect of THz imaging is promising for non-destructive testing (NDT) [2] and security applications [3]. The interference fringes, or more generally the interference-induced artifacts, significantly hamper the recognition of the inside objects and faults, especially in reflective imaging systems [4]. Another issue is the selection of the imaging frequency, which is related to the material absorption and the resolution. The tuning of the frequency over a wide range is very important in a THz see-through imaging system
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