A Review of the Concept, Applications and Implementation Issues of Terahertz Spectral Imaging Technique

Bandyopadhyay, Aparajita; Sengupta, Amartya

doi:10.1080/02564602.2020.1865844

Cited by 38 publications

(16 citation statements)

References 171 publications

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“…Concerning industrial applications of THz imaging and sensing, their possibilities were well-described recently [446,447]. Since industrial applications are very sensitive to convenience-in-use and reliability, we would like to underline only one technology which, in our opinion, can cause a breakthrough in industrial applications.…”

Section: Summary Systems Integration and Possible Extrapolations In Thz Imagingmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

178

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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.

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Section: Summary Systems Integration and Possible Extrapolations In Thz Imagingmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

178

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“…The THz-TDI technique, as a non-contact and non-invasive tool has been used in widespread applications ranging from medical diagnostics and biological studies, security screening, material characterization, quality control and more recently, culture and/or heritage conservation [4]. To implement this spectroscopic imaging technique, an object is imaged with a broadband THz source over a range of THz frequencies and the transmitted or reflected signal off the object is recorded through gated coherent detection.…”

Section: Thz-tdi Leading To Spectroscopic Imagingmentioning

confidence: 99%

Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging techniques

Bandyopadhyay

Bertling

Garg

et al. 2021

Optics for Arts, Architecture, and Archaeology VIII

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This present collaborative research, undertaken in two different hemispheres, in an effort to address the challenge of early structural and sub-surface assessment of heritage marble architectures, like the Taj Mahal, using two complementary non-contact, non-invasive imaging techniques in the THz spectral range. In our previous work, it was already demonstrated that the complementary techniques of broadband Terahertz Time Domain Imaging (THz-TDI) and micro-Raman spectroscopy are successful in probing volume and surface damage in marble with Pietra-dura work. In the present work, the unique combination of THz-TDI and highly sensitive THz-Laser Feedback Interferometry (THz-LFI) have been explored to study sub-surface damage and irregularities of marble structures with Pietra-dura motif. These optical techniques hold immense possibility in large-scale architectural restoration projects as they collectively provide accurate structural depth profile up to several inches into the volume of the marble including the strain generated within the structure leading to potential cracks.

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“…N recent years, terahertz (THz) imaging technology has been used in security screening, clinical and medical applications, pharmaceutical, food and agricultural industries, non-destructive testing and automotive to solve real-world challenges [1][2][3]. One of the most prominent advantages of THz radiation is its ability to penetrate a wide range of materials (fabric, plastic, wood, paper, semiconductors, etc.).…”

Section: Introductionmentioning

confidence: 99%

Fast Processing Approach for Near-Field Terahertz Imaging With Linear Sparse Periodic Array

Molaei

Skouroliakou

et al. 2022

IEEE Sensors J.

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The benefits of terahertz (THz) radiation have increased its use, especially in imaging systems. Recently, the use of a linear sparse periodic array (SPA) has been proposed as an effective solution for two-dimensional (2D) scanning in THz imaging systems. However, the special multistatic structure of the SPA is such that it is not possible to apply fast Fourier transform-based techniques directly in the near-field (NF). Therefore, in this paper, a fast processing approach based on two Fourier techniques compatible with linear SPA is presented for NF THz imaging. In this approach, we first employ a multistatic-to-monostatic conversion to reduce phase errors due to NF multistatic imaging. Then, to improve the quality of the results, we mathematically derive an interpolation formula to counteract the non-uniform spacing of the virtual array. The modified data is then processed by three rapid techniques (fast Fourier transform (FFT)-inverse fast Fourier transform, matched filtering and a novel 1D FFT-based technique with low computational complexity) to obtain reconstructed images of the scene. Numerical and experimental results confirm the satisfactory performance of the proposed approach in terms of both computational time and the quality of the reconstructed image.

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A Review of the Concept, Applications and Implementation Issues of Terahertz Spectral Imaging Technique

Cited by 38 publications

References 171 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging techniques

Fast Processing Approach for Near-Field Terahertz Imaging With Linear Sparse Periodic Array

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