Comparison Between Pulsed Terahertz Imaging and Continuous-Wave Terahertz Imaging

Kun, 杨昆 Yang; Guozhong, 赵国忠 Zhao; Chengsen, 梁承森 Liang; Lizhong, 武利忠 Wu

doi:10.3788/cjl20093611.2853

Cited by 3 publications

(1 citation statement)

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“…THZ imaging technology is one of the main application directions of THZ technology. Current THZ wave imaging technologies are mainly divided into active imaging and passive imaging [5], while active THZ imaging technologies can be divided into transmission, reflection, attenuated full emission and near-field imaging [6][7][8][9][10]. The continuous development of terahertz imaging technology makes it widely used in non-destructive testing, dangerous goods detection, biomedicine, urban security, drug screening and so on.…”

Section: Introductionmentioning

confidence: 99%

DETransMVSnet: Research on Terahertz 3D Reconstruction of Multi-View Stereo Network With Deep Equilibrium Transformers

Bai,

Li,

Wang

et al. 2023

IEEE Access

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Terahertz waves, positioned between microwaves and infrared in the electromagnetic spectrum, stand out with their potent penetration, minimal energy, and consistent absorption profiles for specific substances. Their versatility in applications like non-destructive evaluation, human security scans, and biological diagnostics has propelled them to the forefront of scientific inquiry. Yet, the current state of terahertz equipment, both for generation and acquisition, imposes limitations such as compromised resolution, blurring from diffraction, and clarity degradation due to texture overlaps. As a result, many extant multi-view 3D reconstruction algorithms struggle to yield quality results with terahertz imagery. To circumvent these issues, and specifically the scarcity of terahertz datasets and the conflation of textures, we combined X-ray images from the DTU dataset with our gathered terahertz projections. Observing the inconsistent texture projections in multi-view terahertz images based on angle shifts, we conceptualized the DETransMVSnet -a cutting-edge multi-view 3D reconstruction rooted in the Multi-Scale Deep Equilibrium Layer (MDEQ) paradigm. By tapping into the equilibrium layers of homography-projected feature maps, we can extract masks distinguishing the scene's layers. The Intra-Attention and Mask-Attention Blocks further refine feature selection, retaining pertinent terahertz details while sidelining disruptive background elements. As a testament to its efficacy, DETransMVSnet matches conventional algorithms on the DTU dataset but notably outperforms in terahertz datasets, aptly reconstructing images where predecessors faltered.

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Section: Introductionmentioning

confidence: 99%

DETransMVSnet: Research on Terahertz 3D Reconstruction of Multi-View Stereo Network With Deep Equilibrium Transformers

Bai,

Li,

Wang

et al. 2023

IEEE Access

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Biomedical applications of terahertz technology

Gong

Qiu

Chen

et al. 2019

Applied Spectroscopy Reviews

123

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Common path continuous terahertz reflection and attenuated total reflection imaging

Wu¹,

Xu²,

Wang³

et al. 2021

Acta Phys. Sin.

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Terahertz imaging technology is one of the candidate technologies for medical imaging. In particular, continuous terahertz reflection and attenuated total reflection imaging are expected to achieve rapid intraoperative imaging, which is hot research topic at present. In order to realize the rapid multi-dimensional and high-quality terahertz imaging detection of sample, it is necessary to study the common optical path continuous terahertz reflection/attenuated total reflection dual-mode imaging system based on point scanning. By using the Fresnel formula and the penetration depth formula of evanescent wave, the influence of imaging angle on the reflected signal and the penetration depth of attenuated total reflection are studied theoretically in this paper. The imaging angle of terahertz wave suitable for both reflection and attenuation total reflection imaging is obtained. Based on this, an isoscele total reflection prism with a base angle of 49° is designed. The dual-mode imaging of common optical path continuous terahertz reflection and attenuated total reflection is realized by quickly switching between reflection window and total reflection prism. The reflection and attenuation total reflection imaging modes have imaging resolutions of 400 μm and 500 μm, respectively. Continuous terahertz reflection and attenuated total reflection imaging are experimentally studied by using distilled water and pork as samples. The results show that the relative reflectance of the sample obtained in the attenuated total reflection imaging mode fluctuates within a range of 1%, and the image contrast is 9 times that of the reflection imaging mode. Moreover, attenuated total reflection imaging can effectively identify the sample with the length less than 1 mm. Thus, compared with reflection imaging, continuous terahertz attenuated total reflection imaging has the advantages of high image resolution, high image contrast and highr signal stability, and can accurately obtain the reflectivity of sample. The terahertz attenuated total reflection imaging technology is more helpful in achieving high sensitivity imaging of samples. By combining reflection and attenuated total reflection imaging modes, the advantages of different imaging modes can be compensated for and the performance of the imaging system can be further improved. This common path continuous terahertz reflection and attenuated total reflection dual mode imaging system is expected to achieve a high sensitivity detection of sample.

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Comparison Between Pulsed Terahertz Imaging and Continuous-Wave Terahertz Imaging

Cited by 3 publications

References 0 publications

DETransMVSnet: Research on Terahertz 3D Reconstruction of Multi-View Stereo Network With Deep Equilibrium Transformers

DETransMVSnet: Research on Terahertz 3D Reconstruction of Multi-View Stereo Network With Deep Equilibrium Transformers

Biomedical applications of terahertz technology

Common path continuous terahertz reflection and attenuated total reflection imaging

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