Continuous-wave THz imaging system using microwave photonic double sideband modulation

2020 ◽  
Author(s):  
Gao xiang ◽  
Cao xiaoxiao ◽  
Zhang Lu ◽  
Zhang le ◽  
Wang shiwei ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Imaging System ◽  
Thz Imaging ◽  
Microwave Photonic

scholarly journals THz Reflective Imaging System Utilizing Broadband Homodyne Amplification for Artifact-Free See-Through Imaging

2020 ◽  
Vol 10 (20) ◽  
pp. 7228
Author(s):  
Kiwon Moon ◽  
Il-Min Lee ◽  
Eui Su Lee ◽  
Kyung Hyun Park
Keyword(s):  
Signal Amplification ◽  
Continuous Wave ◽  
Imaging System ◽  
Imaging Techniques ◽  
Thz Imaging ◽  
Material Loss ◽  
Frequency Dependent ◽  
Imaging Capability ◽  
Technical Issues ◽  
Non Destructive

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.

Compact and cost-effective continuous wave THz imaging system

2003 ◽  
Author(s):  
T. Kleine-Ostmann ◽  
P. Knobloch ◽  
M. Koch ◽  
S. Hoffmann ◽  
M. Hofmann ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Imaging System ◽  
Cost Effective ◽  
Thz Imaging

A continuous-wave THz imaging system

2013 ◽  
Author(s):  
Ting-Hang Pei ◽  
Yang-Tung Huang ◽  
Yu-Jiu Wang ◽  
Wei-Zen Chen ◽  
Chien-Nan Kuo ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Imaging System ◽  
Thz Imaging

scholarly journals Nondestructive Internal Defect Detection Using a CW–THz Imaging System in XLPE for Power Cable Insulation

2020 ◽  
Vol 10 (6) ◽  
pp. 2055 ◽  
Author(s):  
In-Sung Lee ◽  
Joong Wook Lee
Keyword(s):  
Nondestructive Testing ◽  
Continuous Wave ◽  
Imaging System ◽  
Electrical Power ◽  
Coherent Detection ◽  
Power Cable ◽  
Thz Imaging ◽  
Cable Insulation ◽  
Detection Scheme ◽  
Thz Waves

The demand for internal nondestructive testing and inspection techniques is rapidly increasing. Using a continuous wave (CW) terahertz (THz) imaging system, we demonstrate that the internal defects in cross-linked polyethylene (XLPE) plates for power cable insulation can be detected. In a coherent detection scheme based on photomixers, which serve as the THz emitters and receivers, the change of phase occurring with the defects inside the XLPE plates is distinctly measured by the change in the amplitude of the transmitted THz waves. According to the two-dimensional images of THz waves transmitted through the XLPE plates, defects of up to 0.5 mm size located inside the XLPE plates can be detected by the internal nondestructive examination method based on CW–THz waves. This technique will be useful for internal nondestructive testing and inspection of insulation materials that require high resolution in various industries, including the automobiles, electronics, and electrical power industries.

scholarly journals Continuous-Wave THz Imaging for Biomedical Samples

2020 ◽  
Vol 11 (1) ◽  
pp. 71
Author(s):  
Yaya Zhang ◽  
Chuting Wang ◽  
Bingxin Huai ◽  
Shiyu Wang ◽  
Yating Zhang ◽  
...  
Keyword(s):  
Medical Imaging ◽  
Biomedical Imaging ◽  
Continuous Wave ◽  
Biological Tissues ◽  
Thz Spectroscopy ◽  
Label Free ◽  
Thz Imaging ◽  
Malignant Tumours ◽  
Advantages And Disadvantages ◽  
Imaging Application

In the past few decades, the applications of terahertz (THz) spectroscopy and imaging technology have seen significant developments in the fields of biology, medical diagnosis, food safety, and nondestructive testing. Label-free diagnosis of malignant tumours has been obtained and also achieved significant development in THz biomedical imaging. This review mainly presents the research status and prospects of several common continuous-wave (CW) THz medical imaging systems and applications of THz medical imaging in biological tissues. Here, we first introduce the properties of THz waves and how these properties play a role in biomedical imaging. Then, we analyse both the advantages and disadvantages of the CW THz imaging methods and the progress of these methods in THz biomedical imaging in recent ten years. Finally, we summarise the obstacles in the way of the application of THz bio-imaging application technology in clinical detection, which need to be investigated and overcome in the future.

scholarly journals Roadmap of Terahertz Imaging 2021

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4092
Author(s):  
Gintaras Valušis ◽  
Alvydas Lisauskas ◽  
Hui Yuan ◽  
Wojciech Knap ◽  
Hartmut G. Roskos
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Computational Imaging ◽  
Imaging Systems ◽  
Thz Imaging ◽  
Operational Conditions ◽  
Frequency Combs ◽  
Wave Imaging ◽  
On Chip ◽  
Nano Imaging

In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

Improvement of continuous-wave terahertz imaging system for cellulose acetate membrane electrophoresis

2012 ◽  
Vol 7 (S1) ◽  
pp. S126-S131 ◽  
Author(s):  
Hongbing Zhang ◽  
Kazutaka Mitobe ◽  
Mahmudul Kabir ◽  
Masafumi Suzuki ◽  
Yoko Mitobe ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Continuous Wave ◽  
Imaging System ◽  
Terahertz Imaging ◽  
Cellulose Acetate Membrane
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