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More and more uncooled terahertz (THz) real-time imaging cameras are being developed and commercialized. For image analysis, the characterization of the optical performance is an important issue. We tested the TZCam camera that integrates the CEA-Leti based on micro-bolometer array coupled to antennas and a resonant cavity structure, and equipped with a terahertz objective. A numerical tool kit has...
Seals are part of our cultural heritage but the study of these objects is limited because of their fragility. Terahertz and X-Ray imaging are used to analyze a collection of wax seals from the fourteenth to eighteenth centuries. In this work, both techniques are compared in order to discuss their advantages and limits and their complementarity for conservation state study of the samples. Thanks to...
. This study focuses on the middle age papers and inks. We use THz spectroscopy imaging for non-destructive evaluation of sheepskin layers. Using a time domain THz spectroscopy and imaging system, THz transmission and reflection images are generated in the 0.1–3 THz range and demonstrate that we can inspect the internal structure.
Additive manufacturing (AM) is an essential tool to make 3D objects. In the industry and laboratories, quality controls of these objects have to be fulfilled. But these quality controls are challenging compared to classical methods of fabrication because of very complex object manufacturing, unachievable with standard tools. Consequently, we demonstrate terahertz (THz) imaging as an efficient method...
Chemometric analysis was applied on terahertz absorbance 3D images, in transmission. The goal is to automatically discriminate some explosives on images and quantify mixtures of RDX/PETN in the frequency range of 0.2–3 THz. Partial Least Square (PLS) was applied on THz absorbance multispectral images to quantify individual product inside pure samples and mixtures at each pixel on the image. Then the...
We investigate the possibility to limit refraction effect at interfaces between a sample and a liquid medium to improve resolution in 2D and 3D terahertz imaging. Indeed, an important part of the terahertz beam is reflected, diffracted and refracted at each interfaces because of refractive index mismatch. We propose to adapt the refractive index of medium around the sample replacing surrounding air...
Detection of explosives has always been an important fact for homeland security. Terahertz spectroscopy and imaging is an emerging, promising candidate in this field. We use time domain THz spectroscopy and we demonstrate that a methodology based on chemometrics is successful for discrimination of explosives and prediction of their concentration in complex samples made by mixture of products.
Terahertz (THz) tomography is a recent imaging technique allowing 3D inspection of opaque objects. In this paper, we investigate a dual-energy experimental setup and a THz tomographic reconstruction algorithm based on dual-energy measurements. We discuss how this dual-energy approach is able to extract physical properties of acquired samples in addition to the 3D reconstruction from acquisitions measured...
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