Review of Terahertz Tomography Techniques

Guillet, Jean-Paul; Recur, Benoît; Frederique, L.; Bousquet, Bruno; Canioni, Lionel; Manek-Hönninger, Inka; Desbarats, Pascal; Mounaix, Patrick

doi:10.1007/s10762-014-0057-0

Cited by 207 publications

(108 citation statements)

References 198 publications

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“…Its feasibility was shown for volumes obtained by optical slicing (or scanning) tomography [77,78], optical rotating scanning tomography(ORST) [155], terahertz tomography [84], confocal microscopy [148], laser-scanning confocal microscopy (LSCM) [194], and ultrasonic imaging [24].…”

Section: Other 3d Imaging Techniquesmentioning

confidence: 99%

Digital Volume Correlation: Review of Progress and Challenges

et al. 2018

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3D imaging has become popular for analyzing material microstructures. When time lapse series of 3D pictures are acquired during a single experiment, it is possible to measure displacement fields via digital volume correlation (DVC), thereby leading to 4D results. Such ForewordThe present paper aims at reviewing the major developments in Digital Volume Correlation (DVC) over the past ten years. It follows the first review on DVC that was published in 2008 by its pioneer [11]. In the latter, the interested reader will find all the general principles associated with what is now called local DVC. They will not be recalled hereafter. In such approaches the region of interest is subdivided into small subvolumes that are independently registered. In addition to its wider use with local approaches, DVC has been extended to global approaches in which the displacement field is defined in a dense way over the region of interest. Kinematic bases using finite element discretizations have been selected. To further add mechanical content, elastic regularization has been introduced. Last, integrated approaches use kinematic fields that are constructed from finite element simulations with chosen constitutive equations. The material parameters (and/or boundary conditions) then become the quantities of interest.These various implementations assume different degrees of integration of mechanical knowledge about the analyzed experiment. First and foremost, DVC can be considered as a stand-alone technique, which has seen its field of applications grow over the last ten years. In this case the measured displacement fields and post-processed strain fields are reported. With the introduction of finite element based DVC, the measured displacement field is continuous. It is also a standalone technique. However, given the fact that it shares common kinematic bases with numerical simulations, it can be easily combined with the latter. One route is to require local satisfaction of equilibrium via mechanical regularization. Another route is to fully merge DVC analyses and numerical simulations via integrated approaches. Different examples will illustrate how these various integration steps can be tailored and what are the current challenges associated with various approaches.

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Section: Other 3d Imaging Techniquesmentioning

confidence: 99%

Digital Volume Correlation: Review of Progress and Challenges

et al. 2018

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“…C 2016 Author(s Due to its unique qualities such as low energy, the ability to penetrate into many opaque materials, the especial excitations for many materials at terahertz (THz) range, and so on, THz wave shows many potential important applications. 1,2 In these fields, low-cost, compact, coherent high-power sources are especially needed. Among all THz sources, terahertz quantum cascade lasers (THz QCLs) are the most suitability to meet the above requirements.…”

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confidence: 99%

High-power terahertz quantum cascade lasers with ∼0.23 W in continuous wave mode

et al. 2016

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Terahertz quantum cascade lasers with a record output power up to ∼0.23 W in continuous wave mode were obtained. We show that the optimal 2.9-mm-long device operating at 3.11 THz has a low threshold current density of 270 A/cm2 at ∼15 K. The maximum operating temperature arrived at ∼65 K in continuous wave mode and the internal quantum efficiencies decreased from 0.53 to 0.19 for the devices with different cavity lengths. By using one convex lens with the effective focal length of 13 mm, the beam profile was collimated to be a quasi Gaussian distribution.

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Section: Thz Pulsed Imaging Systemmentioning

confidence: 99%

“…For example, the performance of THz computed tomography (CT) is improved [50,51]. THz CT can acquire and render 3D images in the THz frequency range, as in the optical, infrared, or X-ray regions of the electromagnetic spectrum [50]. A THz CT system using an injection-seeded parametric source for frequencytunable, Fourier transform-limited and high-power THz emission and a heterodyne detector for sensitive THz detection is demonstrated, as shown in Figure 3 [51].…”

Section: Thz Pulsed Imaging Systemmentioning

confidence: 99%

Terahertz Pulse Detection Techniques and Imaging Applications

Chen¹,

Guo²

2017

Terahertz Spectroscopy - A Cutting Edge Technology

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Recent years have witnessed successful developments of detection techniques of teraherz (THz) pulse radiation and its imaging applications such as security, medicine and environmental sensing, to name an important few. Progress of detection techniques has been made in many aspects, including detection sensitivity, real-time detection, roomtemperature operation, detection bandwidth and dynamic range, spatial (wavefront) and temporal proiles and so on. New detection techniques utilizing cuting-edge materials, sensors, systems and even novel detection mechanisms contribute to advances in teraherz pulse detection. While detection techniques continuously improve, teraherz pulsed imaging (TPI) also inds broad and intriguing applications. For instance, TPI has shown applications in nondestructive evaluation in pharmaceutics, biomedical characterization of tissues, medical diagnosis of cancers, identiication of explosive hazards and examination of art and archeology. The chapter highlights recent progress of teraherz pulse detection techniques and imaging applications.

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Review of Terahertz Tomography Techniques

Cited by 207 publications

References 198 publications

Digital Volume Correlation: Review of Progress and Challenges

Digital Volume Correlation: Review of Progress and Challenges

High-power terahertz quantum cascade lasers with ∼0.23 W in continuous wave mode

Terahertz Pulse Detection Techniques and Imaging Applications

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