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Smart Electronics and Communication Systems (ISENSE), International Conference on

作者： Titto Anujan Tony Jose Vismaya Vijayan Division of ECE Karunya Institute of Technology and Sciences Coimbatore Tamil Nadu Department of Electronics and Communication Engineering College of Engineering Trivandrum Kerala India

ISBN: (数字)9798331528126

ISBN: (纸本)9798331528133

The frequency range of terahertz (THz) has shown great promise for optical communication due to its enormous bandwidth and low interference. This review paper provides a thorough analysis of the latest developments and current obstacles in THz optical *** microwave and infrared wavelengths, the terahertz (THz) frequency range has special possibilities for optical communication *** investigates how THz frequencies and optical communication are convergent, emphasising the latter's promise for high-bandwidth, low-latency data transfer. We investigate possible uses of THz optical communication, such as sensing, imaging, and wireless networks, highlighting the revolutionary influence of this new sector on the design of communication systems in the future.

关键词： Technological innovation Reviews Wireless networks optical attenuators optical imaging Microwave theory and techniques optical fiber communication optical sensors Research and development Terahertz communications

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Preliminary design Of Low-velocity current-meter Rating Facility

Preliminary Design Of Low-velocity Current-meter Rating Faci...

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OCEANS

作者： J. Futrell R. Latorre US Geological Survey MS USA School of Naval Architecture and Marine Engineering University of New Orleans New Orleans LA USA

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design and pre-development of an airborne multi-species differential absorption Lidar system for water vapor and HDO isotope, carbon dioxide, and methane observation

Design and pre-development of an airborne multi-species diff...

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2020 International Conference on Space Optics, ICSO 2020

作者： Dherbecourt, J.B. Raybaut, M. Melkonian, J.M. Hamperl, J. Santagata, R. Dalin, M. Lebat, V. Godard, A. Flamant, C. Totems, J. Chazette, P. Pasiskevicius, V. Heinecke, D. Schäfer, H. Strotkamp, M. Geus, J.F. Rapp, S. Sodemann, H. Steen-Larsen, H.C. DPHY ONERA Université ParisSaclay PalaiseauF-91123 France UMR 8190 CNRS-SU-UVSQ Paris France UMR 1572 CEA-CNRSUVSQ Gif-sur-Yvette France Roslagstullsbacken 21 Stockholm10691 Sweden SpaceTech GmbH Seelbachstr. 13 Immenstaad88090 Germany Fraunhofer Institute for Laser Technology Steinbachstr. 15 Aachen52074 Germany InnoLas Laser GmbH Justus-von-Liebig- Ring 8 Krailling82152 Germany Geophysical Institute University of Bergen Bjerknes Centre for Climate Research Bergen Norway

We report on the current design and preliminary developments of the airborne Lidar Emitter and Multi-species greenhouse gases Observation iNstrument (LEMON), which is aiming at probing H2O and its isotope HDO at 1982 nm, CO2 at 2051 nm, and potentially CH4 at 2290 nm, with the Differential Absorption Lidar method (DIAL). The infrared emitter is based on the combination of two Nested Cavity OPOs (NesCOPOs) with a single optical parametric amplifier (OPA) line for high-energy pulse generation. This configuration is enabled by the use of high-aperture periodically poled KTP crystals (PPKTP), which provide efficient amplification in the spectral range of interest around 2 μm with slight temperature adjustments. The parametric stages are pumped with a Nd:YAG laser providing 200 mJ nanosecond double pulses at 75 Hz. According to parametric conversion simulations supported by current laboratory experiments, output energies in the 40 - 50 mJ range are expected in the extracted signal beam whilst maintaining a good beam quality (M2 © 2021 ESA and CNES

关键词： Carbon dioxide

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optical wireless communication for underwater Wireless Sensor Networks: Hardware modules and circuits design and implementation

Optical wireless communication for underwater Wireless Senso...

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作者： Davide Anguita Davide Brizzolara Giancarlo Parodi DIBE-Department of Biophysical and Electronic Engineering University of Genoa Genoa Italy

Underwater wireless optical communication has been used for establish a link between mobile vehicles and/or fixed nodes because light, especially in the blue/green region, allows to achieve higher data-rate than acoustical or electromagnetic waves for moderate distances. The here proposed work has the aim to pave the way for diffuse optical communication allowing to support optical communication in an Underwater Wireless Sensor Network of dense-deployed fixed nodes for specific application, such as monitoring and surveillance, for shallow, coastal and inland water in the case of moderate/limited area. In particular our research explores the possibility of targeting the interface with current available terrestrial technologies. The use of light impulse for communication is motivated by the possibility of targeting high data-rate, low-cost and small dimension components. This paper describes an overall vision of the system: a HDL implementation of flexible modules for the management of optical communication (based on IEEE 802.15.4 and IEEE 802.11 standard) which target the interface with current terrestrial technology for Wireless Sensor Networks; the design and implementation of circuits for underwater optical point-to-point and planar communication. The preliminary results and design consideration are reported considering also future possible developments.

关键词： Wireless sensor networks optical fiber communication Hardware High speed optical techniques optical sensors optical scattering optical attenuators

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engineering metalenses for planar optics and acoustics

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MATERIALS TODAY PHYSICS 2023年 39卷

作者： Oh, Beomseok Kim, Kyungtae Lee, Dongwoo Rho, Junsuk Pohang Univ Sci & Technol POSTECH Dept Mech Engn Pohang 37673 South Korea Pohang Univ Sci & Technol POSTECH Dept Chem Engn Pohang 37673 South Korea POSCO POSTECH RIST Convergence Res Ctr Flat Opt & Pohang 37673 South Korea

Metalens, a two-dimensional planar system composed of strategically engineered subwavelength structures, facilitates precise manipulation in the process of both light and sound. Benefiting from the synergy between theoretical exploration and cutting-edge fabrication in the past decade, metalenses have attracted considerable attention owing to their thin structure and large number of degrees of freedom. Herein, we comprehensively review recent developments in optical and acoustic metalenses. Initially, we provide an overview of the fundamental principles and design perspectives of metalenses. Subsequently, we discuss the current challenges affecting planar optical and acoustic technologies. Then, we introduce emerging applications that leverage the capabilities of metalenses. Finally, we summarize this review with a discussion of various perspectives to guide future works.

关键词： Metasurface Metalens optical metalens Acoustic metalens Imaging system

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design And Fabrication Of In-plane Ridge Waveguide Surface Emitting Lasers With Two Dry Etched 45/spl deg/ Total Reflection Mirrors

Design And Fabrication Of In-plane Ridge Waveguide Surface E...

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LEOS Summer Topical Meetings

作者： C.P. Chao K.-K. Law J.L. Merz Department of Electrical and Computer Engineering University of California슠Santa Barbara Santa Barbara CA USA

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Advanced optical sensor performance in transmission and distribution applications

Proceedings of the IEEE Power Engineering Society Transmissi...

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Proceedings of the IEEE Power engineering Society Transmission and Distribution Conference 1999年 1卷 259-265页

作者： Cruden, A. Michie, W.C. Niewczas, P. Madden, W.I. McDonald, J.R. Andonovic, I. Univ of Strathclyde Glasgow United Kingdom

This paper reports on recent developments within research into optical fibre based voltage and current measurement equipment for metering and protection applications. Several parameters (thermal variations, intensity fluctuations due to mechanical disturbance, electronic noise) are known to influence the performance of these sensors and this paper summarises an analysis of the effect of such disturbances providing design criteria for the realisation of protection and metering class OCTs. Laboratory trials have shown that the compensation schemes devised reduce vibration errors by 20 to 30 dB and compensate for temperature induced drift to better than 0.1%. Extended engineering evaluation field trials of both OCT and OVT devices within a three phase 132 kV installation have been undertaken over the past two years. Details of these trials are presented to provide an appreciation of the potential difficulties which may be encountered and the benefits which may be derived.

关键词： optical sensors

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On the design of high voltage, high current repetitive opening switches utilizing Gate Turnoff Thyristors

On the design of high voltage, high current repetitive openi...

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Proceedings of the 26th Intersociety Energy Conversion engineering Conference - IECEC '91

作者： Podlesak, Thomas F. Carter, John L. McMurray, James A. US Army Electronic Technology and Devices Lab Fort Monmouth United States

Our Laboratory has demonstrated the feasibility of operating Gate Turnoff Thyristors(GTOs) in series to produce a repetitive opening and closing switch capable of operating at voltages higher than that of a single GTO. The next task is to produce a practical device capable of continuous operation at voltage levels in the tens of kilovolts. The immediate application is to replace gaseous components in the command charger of a high energy pulser system. Our laboratory is currently designing and building such a device. The design issues of such a device are substantial, with high voltage being the least significant, in the sense that optical triggering and standard isolation and insulation techniques can readily handle the system voltages. Control and instrumentation are critical since, for our design goal of 25 KV system voltage, twelve GTOs must be arrayed in series and synchronized in turning off and on, in repetitive time windows on the order of 100 nanoseconds each. Moreover, it is imperative that the possible failure of one device be anticipated and action taken to shutdown the system during this failure mode, again in a 100 nanosecond window. In failure mode, one component failing places all other components at risk, which can have disastrous consequences. Therefore, our design incorporates a computer actuated data acquisition and control system, capable of monitoring the voltage across each of the twelve GTOs and taking appropriate action to protect the system, automatically, during failure mode, with no intervention required from a human operator. Since the switch will operate nearly continuously, thermal management is a key issue. Liquid cooling is required, due to the high dissipation of GTOs. Water cooling presents problems in that electrical conductivity of the coolant can change and present a shorting path for the high voltage. Insulating oil may be used, but the heat transfer efficiency declines drastically, requiring larger, to the point of unwiedly, he

关键词： Electric Switches, Semiconductor

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ISDN LOOP EXTENSION USING A MID-SPAN AMPLIFIER

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 219-224页

作者： ERKER, GJ DODDS, DE KRZYMIEN, WA David E. Dodds was born in Saskatoon Canada in 1945. He received the B. Eng. and MSc. degrees from the University of Saskatchewan in 1966 and 1968 respectively. He worked with Bell Northern Research (Ottawa) on PBX design in 1969 1972 and 1978. Since 1969 he has been with the University of Saskatchewan where he is currently Professor of Electrical Engineering. He teaches courses in electronics and communications and also presents short courses on the fundamentals of telephony. Current research interests are in data transmission signal processing architecture and frame synchronization for PCM and spread spectrum systems. He has been granted five patents relating to commercial products in delta-modulation telephone line interfacing and computer data transmission. In 1986 he was on sabbatical leave at BNR Inc. and worked with an ANSI committee on the standardization of FDDI-II a combined voice and data system. Mr. Dodds is a Registered Consulting Engineer in Saskatchewan. Witold A. Krzyden received his MSc. (Eng.) and Ph.D. degrees (both in Electrical Engineering) in 1970 and 1978 respectively from the Poznan Technical University in Poznan Poland. He was awarded the Minister's of Science and Technology Prize of Excellence for his Ph.D. thesis. From 1970 to 1978 he was a Research Engineer and Teaching Assistant and then from 1978 to 1980 an Assistant Professor of Electrical Engineering at the Poznan Technical University. In 1980 he won a Dutch Government Research Fellowship at the Twente University of Technology in Enschede the Netherlands for the year of 1980/1981. In the following year of 1981/82 he was a Research Assistant Professor there. From 1982 to 1986 he was an Assistant Professor of Electrical Engineering at Lakehead University in Thunder Bay Ontario Canada. In 1986 he joined the Univeristy of Alberta and Alberta Telecommunications Research Centre (now Telecommunications Research Laboratories or TRLabs) as an Associate Professor of Electrical Engineering. Currently he is a Professor of E

The 5.5 km range of the basic rate ISDN loop has been extended by using a negative impedance amplifier and by using a 2 wire/4 wire (2w/4w) amplifier. The negative impedance amplifier extends the range of the loop by 1.0 km, whereas the 2w/4w amplifier extends the range by 1.5 km at the expense of increased complexity. As part of the amplifer design, a resistor/capacitor network has been developed which closely matches the characteristic impedance of telephone cable. Error rate tests have been conducted using various lengths of cable and an operating ISDN line.

关键词： ISDN PHYSICAL LAYER BASIC RATE LOOP RANGE EXTENSION

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Integrated green-grey-blue system: a bibliometric analysis-based review 5

Integrated green-grey-blue system: a bibliometric analysis-b...

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5th International Conference on Green Energy, Environment, and Sustainable Development, GEESD 2024

作者： Jia, Ruilan Fu, Chun Gan, Yuqun School of Infrastructure Engineering Nanchang University Jiangxi Nanchang330038 China Design and Research Institute of Nanchang University Jiangxi Nanchang330038 China School of Public Policy and Management Nanchang University Jiangxi Nanchang330038 China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education Nanchang University Jiangxi Nanchang330038 China School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Nanchang330100 China

ISBN: (纸本)9781510683006

The Integrated Green-Grey-Blue System (IGGBS) represents an advanced strategy for sustainable stormwater management, critically enhancing water resource efficiency and urban resilience. This study utilizes the Web of Science Core Database, R language’s Bibliometrix tool, and CiteSpace software to comprehensively review the research developments in IGGBS. The objective is to integrate international experiences and address current challenges and future directions. The findings indicate: (1) International research on IGGBS has shown consistent growth, with notable increases in China from 2020 to 2023, underscoring its significance in the development of sponge cities;(2) The majority of the studies are published in Q1 category journals of the Journal Citation Reports, predominantly authored by scholars from developed nations such as the USA, UK, and Germany, with fewer contributions from Chinese researchers;(3) IGGBS research is intricately linked with ecosystem services, climate change, urbanization, and resilience theory, trending towards more precise indicators and diverse objectives. Furthermore, the study highlights a gap between theoretical research and practical implementation, pointing to a lack of comprehensive exploration of coupling relationships and future uncertainties. It suggests the necessity to enhance evaluation systems, and foster interdisciplinary collaboration and public engagement, closely aligned with policy, to facilitate the broader adoption and management of IGGBS. © 2024 SPIE.

关键词： Climate change

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