How Do Detected Objects Affect the Noise Distribution of Terahertz Security Images?

Wang, Zhaodi; Hu, Menghan; Kuruoğlu, Erçan E.; Zhu, Wenhan; Zhai, Guangtao

doi:10.1109/access.2018.2859359

Cited by 13 publications

(5 citation statements)

References 22 publications

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“…What's more, imaging with higher resolution [8]- [11] can also be achieved by increasing the frequencies and bandwidth of incident waves. With this function, THz imaging is rapidly developed to meet the requirement of some commercial applications, such as THz medical imaging test [12]- [14], atmospheric and environmental monitoring [15]- [17], THz radar [18], [19], national security and anti-terrorism [20]- [23].…”

Section: B the Application Of Low-thz Antennamentioning

confidence: 99%

A Review of Broadband Low-Cost and High-Gain Low-Terahertz Antennas for Wireless Communications Applications

Gao

Sanz-Izquierdo

et al. 2020

IEEE Access

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100 GHz-1.0 THz) technology is expected to provide unprecedented data rates in future generations of wireless system such as the 6 th generation (6G) mobile communication system. Increasing the carrier frequencies from millimeter wave to THz is a potential solution to guarantee the transmission rate and channel capacity. Due to the large transmission loss of Low-THz wave in free space, it is particularly urgent to design high-gain antennas to compensate the additional path loss, and to overcome the power limitation of Low-THz source. Recently, with the continuous updating and progress of additive manufacturing (AM) and 3D printing (3DP) technology, antennas with complicated structures can now be easily manufactured with high precision and low cost. In the first part, this paper demonstrates different approaches of recent development on wideband and high gain sub-millimeter-wave and Low-THz antennas as well as their fabrication technologies. In addition, the performances of the state-of-the-art wideband and high-gain antennas are presented. A comparison among these reported antennas is summarized and discussed. In the second part, one case study of a broadband high-gain antenna at 300 GHz is introduced, which is an all-metal model based on the Fabry-Perot cavity (FPC) theory. The proposed FPC antenna is very suitable for manufacturing using AM technology, which provides a low-cost, reliable solution for emerging THz applications.INDEX TERMS Antennas, low-terahertz, additive manufacturing (AM), high gain, Fabry-Perot cavity (FPC), low-cost, three-dimensional printing (3DP). I. INTRODUCTIONA.

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Section: B the Application Of Low-thz Antennamentioning

confidence: 99%

A Review of Broadband Low-Cost and High-Gain Low-Terahertz Antennas for Wireless Communications Applications

Gao

Sanz-Izquierdo

et al. 2020

IEEE Access

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“…Currently, the Terahertz (THz) band, which lies between the end of the infrared band and the start of the microwave band, is used in imaging bodies under dielectric surfaces [4]. Like microwave radiation, THz radiation can penetrate a wide variety of non-metallic and non-polar materials, such as plastics, glasses, woods and dry soil, making it suitable for detecting buried objects and concealed illegal materials and underground imaging [4], [5]. The limitation of THz propagation through water enables measuring and imaging moisture faction in other materials and water diffusion using different dielectric models [5].…”

Section: Figurementioning

confidence: 99%

“…Like microwave radiation, THz radiation can penetrate a wide variety of non-metallic and non-polar materials, such as plastics, glasses, woods and dry soil, making it suitable for detecting buried objects and concealed illegal materials and underground imaging [4], [5]. The limitation of THz propagation through water enables measuring and imaging moisture faction in other materials and water diffusion using different dielectric models [5]. These models suppose moisture as particles in a host dielectric material and estimates water faction based on the measured constants, like the Effective Absorption (Net Attenuation) Coefficient and Effective Permittivity of the mixture, water particles and the host material, compared mathematically to the known individual constants of each of these materials [6].…”

Section: Figurementioning

confidence: 99%

Communication Network for Ultrasonic Acoustic Water Leakage Detectors

et al. 2020

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Water leaks in the distribution network produce significant losses and cause serious economic inconvenience especially in areas with water shortage. In this paper, the operational aspects of the most popular offline detection technologies, ground penetrating radars (GPR's), infrared (IR) cameras, and acoustic detectors, were compared. The authors also studied the potential of using the recent Terahertz imaging technology for the same application. Acoustic detectors were found the most suitable technology for the atmosphere in UAE, where the levels of humidity and, consequently, soil moisture are high, because both of GPRs and IR cameras operational capability to detect leaks tend to decrease sharply as soil moisture increases. On the other side, a conventional acoustic detector has very limited scope of detection. This paper presents a method of expanding the sensing component of acoustic detectors by connecting acoustic sensors through a digital communication system using the 3G/4G networks to a monitoring center with an acoustic spectrum analyzer. The novelty of this system is its ability to provide offline detection of leakages in the underground water pipelines remotely without deforming the surrounding environment or adjusting the acoustic detector's analyzing system. Simulation results proves the ability of the system to reconstruct the input noise signal at the end of the proposed network which is to be connected to the acoustic analyzer.

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“…Terahertz (THz) imaging has become a hot topic in scientific research due to its special properties: nonionizing, high penetration, and so on. 1,2 However, the poor resolution of THz imaging has been a great obstacle among these applications.…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of different deconvolution methods on 2D terahertz imaging

Ning

et al. 2023

Micro & Optical Tech Letters

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Terahertz (THz) images are always to be degraded because of the diffraction phenomenon. In this letter, the wave nature is considered in the resolution enhancement of terahertz imaging. The phase operation is extended to three classical deconvolution algorithms, which are used in THz complex-value deconvolution field. The resolution improvement can be seen, and it is impressive that the resolution can reach 0.5 times of the wavelength via the complex-value total variation deconvolution. We believe that the current resolution of THz imaging system can be significantly upgraded by taking advantage of such approaches.

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How Do Detected Objects Affect the Noise Distribution of Terahertz Security Images?

Cited by 13 publications

References 22 publications

A Review of Broadband Low-Cost and High-Gain Low-Terahertz Antennas for Wireless Communications Applications

A Review of Broadband Low-Cost and High-Gain Low-Terahertz Antennas for Wireless Communications Applications

Communication Network for Ultrasonic Acoustic Water Leakage Detectors

Performance comparison of different deconvolution methods on 2D terahertz imaging

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