Proceedings ArticleDOI
THz computed tomography system with zero-order Bessel beam
Liting Niu,Qiao Wu,Kejia Wang,Jinsong Liu,Zhengang Yang +4 more
- Vol. 10623, pp 1062303
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TLDR
In this paper, a 0.3 THz zero-order Bessel beam was used to improve the depth of focus of this imaging system for the non-diffraction property of Bessel beams.Abstract:
Terahertz (THz) waves can penetrate many optically opaque dielectric materials such as plastics, ceramics and colorants. It is effective to reveal the internal structures of these materials. We have built a THz Computed Tomography (CT) system with 0.3 THz zero-order Bessel beam to improve the depth of focus of this imaging system for the non-diffraction property of Bessel beam. The THz CT system has been used to detect a paper cup with a metal rod inside. Finally, the acquired projection data have been processed by the filtered back-projection algorithm and the reconstructed image of the sample has been obtained.read more
Citations
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Journal ArticleDOI
3D image reconstruction of terahertz computed tomography at sparse angles by total variation minimization
TL;DR: In this article, the total variation minimization iterative algorithm was applied to squeeze 75% data acquisition time of continuous-wave computed tomography (THz-CT) without the loss of reconstruction fidelity.
Proceedings ArticleDOI
Total-Variation Iterative Algorithm for Terahertz Transmission Computed Tomography
TL;DR: In this paper, a 3D continuous-wave (CW) terahertz computed tomography (CT) system employing a teraherstz sources (IMPATT diodes) operating at 278.6 GHz is presented.
Journal ArticleDOI
High accuracy terahertz computed tomography using a 3D printed super-oscillatory lens
TL;DR: In this paper , a binary terahertz super-oscillatory lens is proposed with a full width at half-maximum of 0.97λ, a focal length of 48λ, and a focal depth of 25λ.
References
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Journal ArticleDOI
Imaging with terahertz waves
B. B. Hu,Martin C. Nuss +1 more
TL;DR: This work presents what is to their knowledge the first imaging system based on optoelectronic terahertz time-domain spectroscopy, and demonstrates applications to package inspection and chemical content mapping in biological objects.
Journal ArticleDOI
A single-pixel terahertz imaging system based on compressed sensing
Wai Lam Chan,Kriti Charan,Dharmpal Takhar,Kevin F. Kelly,Richard G. Baraniuk,Daniel M. Mittleman +5 more
TL;DR: In this paper, a terahertz imaging system that uses a single pixel detector in combination with a series of random masks to enable high-speed image acquisition is described, based on the theory of compressed sensing, which permits the reconstruction of a N-by-N pixel image using much fewer than N2 measurements.
Journal ArticleDOI
Two‐dimensional electro‐optic imaging of THz beams
TL;DR: In this article, a novel electro-optic sampling system for real-time terahertz (THz) imaging applications was proposed, which achieved time-resolved images of pulsed far-infrared radiation emitted from an unbiased GaAs wafer.
Journal ArticleDOI
T-ray computed tomography.
TL;DR: A tomographic imaging modality that uses pulsed terahertz (THz) radiation to probe the optical properties of three-dimensional structures in the far-infrared, analogous to conventional CT techniques such as x-ray CT.
Journal ArticleDOI
High quality quasi-Bessel beam generated by round-tip axicon
TL;DR: This work shows how the spatial filtration of the beam in the Fourier plane improves this spatial beam distribution and removes the undesired intensity modulation of the quasi-Bessel beam.