IEEE Transactions on Terahertz Science and Technology最新文献_第8页

Terahertz Imaging With 3D-Printed Risley-Prism and Telecentric Objective 利用 3D 打印的 Risley 棱镜和远心物镜进行太赫兹成像

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-23 DOI: 10.1109/TTHZ.2024.3404642

Bryce Chung;Daniel Headland;Withawat Withayachumnankul

{"title":"Terahertz Imaging With 3D-Printed Risley-Prism and Telecentric Objective","authors":"Bryce Chung;Daniel Headland;Withawat Withayachumnankul","doi":"10.1109/TTHZ.2024.3404642","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3404642","url":null,"abstract":"Nondestructive evaluation is one of the key envisaged applications for terahertz technology due to nonionizing energy levels and the ability to penetrate many optically opaque materials. Conventional terahertz imaging systems typically rely on raster scanning the target with a moving transceiver, or make use of goniometric beam manipulation schemes. As an alternative, we propose the use of a Risley-prism, essentially a cascaded pair of independently rotating prisms, to function as a simple beam-steering mechanism. When deployed in conjunction with an aspheric, telecentric objective, the Risley-prism allows for scanning a focused terahertz beam in two dimensions. We utilize 3D-printed cyclic olefin copolymer, a low-loss and low-dispersion polymer, to minimize material loss and facilitate the construction of these bulk optics. Owing to true time delay, our imaging system operates over 220–330 GHz, making use of this bandwidth for resolving depth features and hidden objects. We achieve a spatial resolution of 0.419 lp/mm over a circular scanning region 27.8 mm in diameter. The proposed Risley-prism imaging system offers a simple solution to the complicated problem of broadband and high resolution imaging, and hence, is readily amenable to widespread adoption and commercial applications.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 4","pages":"446-454"},"PeriodicalIF":3.9,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141494984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling Analysis and Research of Terahertz Wave Propagation Experiment at Sea 太赫兹波海上传播实验的建模分析与研究

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-20 DOI: 10.1109/TTHZ.2024.3379749

Xiangchun Cao;Juan Liu;Jianhong Hao;Qiang Zhao;Bixi Xue;Fang Zhang;Jieqing Fan;Changxing Lin;Zhiwei Dong

{"title":"Modeling Analysis and Research of Terahertz Wave Propagation Experiment at Sea","authors":"Xiangchun Cao;Juan Liu;Jianhong Hao;Qiang Zhao;Bixi Xue;Fang Zhang;Jieqing Fan;Changxing Lin;Zhiwei Dong","doi":"10.1109/TTHZ.2024.3379749","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3379749","url":null,"abstract":"In this article, the propagation loss of 0.14 THz signal propagating for 27 km at sea is measured experimentally and compared with the simulation results of model in the International Telecommunication Union-Radiocommunication Sector. The results show that the average difference between the simulated and experimental values of signal received power is −5.2 dB, and all the simulation results overestimate the propagation loss. Considering that evaporation duct is ubiquitous in the marine atmosphere and may affect the propagation characteristics of terahertz wave, a new computational model is proposed. More than half of the simulated values based on this model agree well with the measured data, with an average difference of −1.3 dB, but the maximum difference of a single point reaches −18.6 dB, which is mainly caused by the sensitivity of the model to meteorological parameters. The “waveguide effect” in the evaporation duct environment is further simulated by adjusting the transmit antenna height from 29 to 10 m. At this time, although the atmospheric absorption loss increases by 1 dB on average, the total path loss decreases by 5.4 dB on average, which effectively reduces the propagation loss and makes it possible for the long-range transmission of terahertz wave.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 3","pages":"377-385"},"PeriodicalIF":3.2,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140820386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Beyond 500 GHz THz Wireless Links Based on Heterodyne Photomixing and Absolute Operation Pruned Two-Stage MIMO–Volterra 超越 500 GHz 太赫兹无线链路，基于异频光电混合和绝对操作剪枝两级 MIMO-Volterra

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-18 DOI: 10.1109/TTHZ.2024.3377354

Junting Shi;Yanyi Wang;Jiao Zhang;Xianming Zhao;Min Zhu;Wen Zhou;Jianjun Yu

{"title":"Beyond 500 GHz THz Wireless Links Based on Heterodyne Photomixing and Absolute Operation Pruned Two-Stage MIMO–Volterra","authors":"Junting Shi;Yanyi Wang;Jiao Zhang;Xianming Zhao;Min Zhu;Wen Zhou;Jianjun Yu","doi":"10.1109/TTHZ.2024.3377354","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3377354","url":null,"abstract":"Compared to the traditional Volterra nonlinear equalizer (VNE), the multi-input, multioutput (MIMO)–VNE is capable of addressing the signal degradation caused by higher order cross-talk. Naturally, the gains from the MIMO architecture are at the cost of doubling the amount of computation. To reduce the calculation workload, based on the two-stage serial–parallel MIMO architecture, the absolute operation of the cross-beating terms and the pruning technique, an extremely low-complexity MIMO–VNE, namely absolute-term pruned two-stage (AT-P-2S) MIMO–VNE, has been proposed in this article. With the proposed AT-P-2S MIMO–VNE and optical mixing technique, terahertz wave transmission over 500 GHz is successfully demonstrated. The experimental results show that the AT–P–2S–MIMO–VNE demonstrates very comparable BER performance to the MIMO–VNE, and can achieve more than 4% capacity improvement in the beyond-500 GHz band. Meanwhile, in contrast to MIMO–VNE, AT–P–2S–MIMO–VNE can reduce the equalizer real multiplication operation by more than 94%. By striking a balance between performance and complexity, the proposed AT–P–2S–MIMO–VNE offers an appealing solution to enhance the efficiency and effectiveness of future communication systems.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 3","pages":"364-376"},"PeriodicalIF":3.2,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140820347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seeing Around Obstacles Using Active Terahertz Imaging 利用主动太赫兹成像技术看清周围的障碍物

IF 3.9 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-14 DOI: 10.1109/TTHZ.2024.3401041

Yiran Cui;Georgios C. Trichopoulos

{"title":"Seeing Around Obstacles Using Active Terahertz Imaging","authors":"Yiran Cui;Georgios C. Trichopoulos","doi":"10.1109/TTHZ.2024.3401041","DOIUrl":"https://doi.org/10.1109/TTHZ.2024.3401041","url":null,"abstract":"In this article, we show how active terahertz (THz) imaging systems can exploit the unique propagation properties of THz waves to reconstruct images of nonline-of-sight (NLoS) scenes. Most building surfaces' material properties and roughness allow for a unique combination of diffuse and strong specular scattering. As a result, most surfaces behave as lossy mirrors that enable propagation paths between a THz camera and the NLoS scenes. We propose a mirror folding algorithm that tracks the multireflection propagation of THz waves to correct the image from cluttering and see around occlusions without prior knowledge of the scene geometry and material properties. To validate the feasibility of the proposed NLoS imaging approach, we carried out a numerical analysis and developed two THz imaging systems to demonstrate real-world NLoS imaging experiments in sub-THz bands (270–300 GHz). The results show the capability of THz radar imaging systems to recover both the geometry and pose of LoS and NLoS objects with centimeter-scale resolution in various multipath propagation scenarios. THz NLoS imaging can operate in low visibility conditions (e.g., night, strong ambient light, and smoke) and uses computationally inexpensive image reconstruction algorithms.","PeriodicalId":13258,"journal":{"name":"IEEE Transactions on Terahertz Science and Technology","volume":"14 4","pages":"433-445"},"PeriodicalIF":3.9,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141495181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical and Experimental Investigation on the Effect of Beam Misalignment on a Second Harmonic 0.8 THz Gyrotron 光束错位对二次谐波 0.8 太赫兹陀螺仪影响的理论和实验研究

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-05 DOI: 10.1109/TTHZ.2024.3373251

Xianfei Chen;Houxiu Xiao;Yu Huang;Runfeng Tang;Donghui Xia;Xiaotao Han

引用次数: 0

IEEE Transactions on Terahertz Science and Technology Publication Information 电气和电子工程师学会太赫兹科学与技术论文集》出版信息

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-04 DOI: 10.1109/TTHZ.2024.3368955

引用次数: 0

TechRxiv: Share Your Preprint Research with the World! TechRxiv：与世界分享您的预印本研究成果！

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-04 DOI: 10.1109/TTHZ.2024.3368966

引用次数: 0

IEEE Transactions on Terahertz Science and Technology Information for Authors 太赫兹科学与技术》（IEEE Transactions on Terahertz Science and Technology）作者须知

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-04 DOI: 10.1109/TTHZ.2024.3368953

引用次数: 0

IEEE Microwave Theory and Techniques Society Information 电气和电子工程师学会微波理论与技术协会信息

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-04 DOI: 10.1109/TTHZ.2024.3368951

引用次数: 0

TechRxiv: Share Your Preprint Research with the World! TechRxiv：与世界分享您的预印本研究成果！

IF 3.2 2区工程技术

IEEE Transactions on Terahertz Science and Technology Pub Date : 2024-03-02 DOI: 10.1109/TTHZ.2024.3393789

引用次数: 0