Radioengineering最新文献_第4页

Software-Defined 1550-nm Full-Fiber Doppler Lidar for Contactless Vibration Measurement of High Voltage Power Equipment 用于高压电力设备非接触振动测量的软件定义1550nm全光纤多普勒激光雷达

IF 1.1 4区工程技术

Radioengineering Pub Date : 2023-09-01 DOI: 10.13164/re.2023.0391

X. Guan, C. Lv, Guoyan Zheng, Z. Pan, K. Cai

{"title":"Software-Defined 1550-nm Full-Fiber Doppler Lidar for Contactless Vibration Measurement of High Voltage Power Equipment","authors":"X. Guan, C. Lv, Guoyan Zheng, Z. Pan, K. Cai","doi":"10.13164/re.2023.0391","DOIUrl":"https://doi.org/10.13164/re.2023.0391","url":null,"abstract":". In this work, a 1550-nm full-fiber Doppler lidar via software-defined platform is built to realize flexible and low-cost contactless vibration measurement of high-voltage power equipment. A 1550-nm fiber layout is designed to generate optical interference between vibration signal and carrier wave. The reflected vibration signal is collected by an optical transceiver and the carrier wave is generated by an acousto-optic modulator (AOM). The optical beat signal is collected by a balanced detector (BD) then sent into a general software defined radio (SDR) receiver. By GNU developing platform, the target mechanical vibration signal is demodulated and several flexible functions such as speed-acceleration trans, harmonic component analysis and fault diagnosis is realized. Performance of Doppler lidar is first verified on mechanical vibration source by PZT vibration actuator, results show that the designed lidar could retrieve 50 Hz–20 kHz mechanical vibration signals within the working distance is up to 20 m. Further case application scenarios on the power transformer and gas-insulated switchgear (GIS) are also conducted to verify the feasibility of proposed lidar.","PeriodicalId":54514,"journal":{"name":"Radioengineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41938578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Polarization–Insensitive Angularly Stable Compact Triple Band Stop Frequency Selective Surface for Shielding Electromagnetic Radiations 用于屏蔽电磁辐射的偏振-不敏感角度稳定紧凑型三频带阻频率选择表面

IF 1.1 4区工程技术

Radioengineering Pub Date : 2023-09-01 DOI: 10.13164/re.2023.0400

J. Acharjee, Ankita Pathak, Gouri Shankar, Paul, K. Mandal

{"title":"Polarization–Insensitive Angularly Stable Compact Triple Band Stop Frequency Selective Surface for Shielding Electromagnetic Radiations","authors":"J. Acharjee, Ankita Pathak, Gouri Shankar, Paul, K. Mandal","doi":"10.13164/re.2023.0400","DOIUrl":"https://doi.org/10.13164/re.2023.0400","url":null,"abstract":". A compact single-layer, polarization-insensitive, and angularly stable frequency selective surface (FSS) based multi-stop band filter is reported for shielding three useful frequency bands covering 1.82–2.86 GHz Industrial, scientific, and medical (ISM), 3.52–4.06 GHz Worldwide Interoperability for Microwave Access (WiMAX), and 7.42–8.72 GHz (satellite downlink), centered at 2.4 GHz, 3.6 GHz, and 8.1 GHz, respectively. The proposed unit cell (15 mm × 15 mm) contains four equal-sized square-headed dumbbell (SHD) shaped resonators surrounded by two square ring resonators. The outer and inner square rings offer the first and second stop bands, while the SHD resonators provide the third stop band. A highly polarization-insensitive response is realized owing to the four-fold symmetry in the proposed structure. The unique arrangements of the SHD resonators help to realize higher angular stability under transverse electric (TE), transverse magnetic (TM), and diagonally polarized incident electromagnetic (EM) waves for incidence angles up to 80°, 80°, and 70°, respectively. A detailed analysis in terms of equivalent circuit and parametric variation is carried out to illustrate the higher to lower frequency band ratio. A prototype is fabricated and tested through a proper measurement setup to validate its performance, and it shows good agreement with the simulated results. The proposed FSS unit cell offers better angular stability under diagonally polarised incident waves, attenuation level, minimum higher to lower frequency band ratio, good fractional bandwidth, and compactness. So the designed multi-stopband FSS can be considered a potential candidate for shielding EM radiation across the useful bands.","PeriodicalId":54514,"journal":{"name":"Radioengineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46302193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Improved Channel Estimation and Equalization for Single-Carrier IEEE 802.11ad Receivers 改进的单载波IEEE 802.11ad接收机信道估计和均衡

IF 1.1 4区工程技术

Radioengineering Pub Date : 2023-09-01 DOI: 10.13164/re.2023.0438

G. Baruffa, L. Rugini

引用次数: 0

Design of a Dual-Band Three-Way Power Divider with Unequally High Power Split Ratio 非等高功率分割比双频三路功率分压器的设计

IF 1.1 4区工程技术

Radioengineering Pub Date : 2023-09-01 DOI: 10.13164/re.2023.0338

M. G. Nguyen, C. Nguyen, T. H. Nguyen, H. Morishita

引用次数: 0

Machine Learning Based Classification of IoT Traffic 基于机器学习的物联网流量分类