Depth resolution by continuous-wave imaging

2007 ◽  
Author(s):  
E. Burteçin Aksel ◽  
Ata Akin
Keyword(s):  
Continuous Wave ◽  
Depth Resolution ◽  
Wave Imaging

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.

Material characterisation by enhanced resolution in non-stationary thermal wave imaging

2021 ◽  
Vol 63 (12) ◽  
pp. 721-726
Author(s):  
G T Vesala ◽  
V S Ghali ◽  
S Subhani ◽  
Y Naga Prasanthi
Keyword(s):  
Defect Detection ◽  
Thermal Wave ◽  
Signal To Noise Ratio ◽  
Empirical Relationship ◽  
Depth Resolution ◽  
Steel Sample ◽  
Detection Depth ◽  
Wave Imaging ◽  
Domain Phase ◽  
Thermal Wave Imaging

In the recent past, quadratic frequency-modulated thermal wave imaging (QFMTWI) has been advanced with a chirp z-transform (CZT)-based processing approach to facilitate enhanced subsurface anomaly detection, depth quantification and material property estimation with enhanced depth resolution. In the present study, the applicability of CZT-based phase analysis for foreign object defect detection in a structural steel sample using QFMTWI is validated through finite element-based numerical modelling rather than experimental verification due to limited available resources. Furthermore, the enhanced defect detection capability of the CZT phase approach is qualitatively compared with the frequency- and time-domain phase approaches using the defect signal-to-noise ratio (SNR) as a quality metric. Also, an empirical relationship between the observed phases and the thermal reflection coefficient is obtained, which recommends the CZT phase as a prominent approach for foreign material defect detection.

scholarly journals Relative capacities of time-gated versus continuous-wave imaging to localize tissue embedded vessels with increasing depth

2010 ◽  
Vol 15 (1) ◽  
pp. 016015 ◽  
Author(s):  
Nimit L. Patel ◽  
Zi-Jing Lin ◽  
Yajuvendra Rathore ◽  
Edward H. Livingston ◽  
Hanli Liu ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Wave Imaging

Real-time continuous-wave imaging with a 1.63THz OPTL and a pyroelectric camera

2008 ◽  
Vol 4 (4) ◽  
pp. 295-298 ◽  
Author(s):  
Jun Yang ◽  
Shuang-chen Ruan ◽  
Min Zhang ◽  
Wei Zhang
Keyword(s):  
Real Time ◽  
Continuous Wave ◽  
Wave Imaging

scholarly journals Three-Dimensional Terahertz Continuous Wave Imaging Radar for Nondestructive Testing

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 144259-144276
Author(s):  
Xiaoxuan Zhang ◽  
Tianying Chang ◽  
Zhongmin Wang ◽  
Hong-Liang Cui
Keyword(s):  
Nondestructive Testing ◽  
Continuous Wave ◽  
Three Dimensional ◽  
Imaging Radar ◽  
Wave Imaging

High-Quality Continuous-Wave Imaging with a 2.53 THz Optical Pumped Terahertz Laser and a Pyroelectric Detector

2010 ◽  
Vol 27 (12) ◽  
pp. 124209 ◽  
Author(s):  
Pi-Bin Bing ◽  
Jian-Quan Yao ◽  
De-Gang Xu ◽  
Xiao-Yan Xu ◽  
Zhong-Yang Li
Keyword(s):  
Continuous Wave ◽  
Pyroelectric Detector ◽  
High Quality ◽  
Wave Imaging
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