A sparse array based sub-terahertz imaging system for volume inspection

Baccouche, B.; Keil, Andreas; Kahl, Matthias; Bolívar, P. Haring; Loeffler, Torsten; Jonuscheit, Joachim; Friederich, Fabian

doi:10.1109/eumc.2015.7345794

Cited by 14 publications

(7 citation statements)

References 14 publications

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“…With regard to the inspection of materials and objects, FMCW techniques at the interface between the microwave and THz frequency regimes have established themselves by now [377][378][379][380], and the measurement systems continue to be improved [381][382][383][384][385].…”

Section: Thz Mcw Imagingmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

175

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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: Thz Mcw Imagingmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

175

View full text Add to dashboard Cite

show abstract

“…We experimentally investigated the imaging performance of the algorithms using measurement data from the imaging system presented in Baccouche et al (2015), which combines a sparse line array with a band-conveyor for 3-D tera-hertz imaging as sketched in Fig. 1.…”

Section: Measurement Resultsmentioning

confidence: 99%

Comparison of digital beamforming algorithms for 3-D terahertz imaging with sparse multistatic line arrays

et al. 2017

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Abstract. In this contribution we compare the backprojection algorithm with our recently developed modified range migration algorithm for 3-D terahertz imaging using sparse multistatic line arrays. A 2-D planar sampling scheme is generated using the array's aperture in combination with an orthogonal synthetic aperture obtained through linear movement of the object under test. A stepped frequency continuous wave signal modulation is used for range focusing.Comparisons of the focusing quality show that results using the modified range migration algorithm reflect these of the back-projection algorithm except for some degradation along the array's axis due to the operation in the array's near-field. Nevertheless the highest computational efficiency is obtained from the modified range migration algorithm, which is better than the numerically optimized version of the back-projection algorithm. Measurements have been performed by using an imaging system operating in the W frequency band to verify the theoretical results.

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“…5a shows the realization of a terahertz measurement system following this concept, which was developed in our group. Some more details of our system are given in [21,22]. The multistatic line array consists of 12 W-band transmitters (Tx) and 12 W-band heterodyne receivers (Rx).…”

Section: Inline Inspection With Sparse Arraysmentioning

confidence: 99%

Terahertz Quality Inspection for Automotive and Aviation Industries

Ellrich

Bauer

Schreiner

et al. 2019

J Infrared Milli Terahz Waves

Self Cite

131

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Nondestructive quality inspection with terahertz waves has become an emerging technology, especially in the automotive and aviation industries. Depending on the specific application, different terahertz systems-either fully electronic or based on optical laser pulses-cover the terahertz frequency region from 0.1 THz up to nearly 10 THz and provide high-speed volume inspections on the one hand and high-resolution thickness determination on the other hand. In this paper, we present different industrial applications, which we have addressed with our terahertz systems within the last couple of years. First, we show three-dimensional imaging of glass fiber-reinforced composites and foam structures, and demonstrate thickness determination of multilayer plastic tube walls. Then, we present the characterization of known and unknown multilayer systems down to some microns and the possibility of measuring the thickness of wet paints. The challenges of system reliability in industrial environments, e.g., under the impact of vibrations, and effective solutions are discussed. This paper gives an overview of state-of-the-art terahertz technology for industrial quality inspection. The presented principles are not limited to the automotive and aviation industries but can also be adapted to many other industrial fields.

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A sparse array based sub-terahertz imaging system for volume inspection

Cited by 14 publications

References 14 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

Comparison of digital beamforming algorithms for 3-D terahertz imaging with sparse multistatic line arrays

Terahertz Quality Inspection for Automotive and Aviation Industries

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