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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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Ultrashort Throw Lenses with Catadioptric Relay Suitable for Flat and Curved Screens 11

Ultrashort Throw Lenses with Catadioptric Relay Suitable for...

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conference on current developments in Lens design and optical engineering XXI

作者： Nishikawa, Jun Nishiyama, Mariko Sony Corp R&D Ctr Atsugi Kanagawa Japan

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In the past two decades, to realize high resolutions and low distortions while miniaturizing optical systems, various ultrashort throw lenses (USTs) have been proposed. In this work, ultrashort throw lenses with a catadioptric relay (USTCRs) with rotational symmetry are proposed to provide the solution. First, the initial design method of the USTCR and the optimized design solution are presented. Although this optical system with a throw ratio of 0.26:1 has resolutions and distortions equivalent to those of conventional UST with one aspherical mirror, the depth of focus (DOF) on the panel side becomes 1.31 times deeper with appropriate corrections of the field curvature. The total length of the lens is reduced to 0.89 times, the area of the main mirror is reduced to 0.22 times, and the number of lenses is reduced from 13 to 9 elements. Based on these results, several optical designs for USTCR have been tried and an optical design with robustness has been proposed. By optimizing the power of each lens group, the decenter sensitivity improved to 0.46 times for parallel decenter and 0.55 times for tilt decenter. By optimizing glass materials, the shift of focal plane can be suppressed to 0.56 times when the temperature increases by 30 degrees C. An USTCR suited for a curved screen has also been proposed. By introducing appropriate constraints that correct distortions, high resolutions and low distortions have been realized while maintaining a wide angle of view. USTCRs suited for various curved screens are currently underway.

关键词： ultrashort throw projector projection lens catadioptric relay lens lens design lens system design concave mirror curved screen mirror system design

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Quantifying The Effects of Interface Defect Density on Charge Transport in CsPb0.625Zn0.375I2Br Solar Cells

Quantifying The Effects of Interface Defect Density on Charg...

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Renewable Energy and Sustainable E-Mobility conference (RESEM), IEEE

作者： Navdeep Kaur Jaya Madan Rahul Pandey VLSI Centre of Excellence Chitkara University Institute of Engineering and Technology Chitkara University Punjab India

In current era of green energy, technology is shifting toward usability of solar energy. Among the popularly used semiconductor materials in photovoltaic devices, perovskite material has been investigated on large scale due to its excellent optical performance. The photovoltaic performance (Pv) of perovskite-based solar cells (PSC) has demonstrated exceptional performance in solar cell. Hybrid perovskite material possess high carrier life time, absorption co-efficient and diffusion length. In addition, it has feasibility to tune bandgaps to absorb different wavelengths. However, lead present in hybrid perovskite compounds is hazardous for environment. Also presence of organic cation is the main cause of thermal instability in hybrid perovskite. This study primarily aims to explore all inorganic halide perovskites (IHP) in photovoltaic cell. Due to outstanding optical performance and thermal stability of IHP materials, interest of researchers is shifting toward this material. The proposed design uses a low-lead IHP CsPb 0.625 Zn 0.375 I 2 Br, in the active layer of PSC structure. The device structure has simulated using simulator SCAPS-1D to verify the impact of interface defect density (IDD) at TiO2/ CsPb 0.625 Zn 0.375 I 2 Br and CsPb 0.625 Zn 0.375 I 2 Br / Spiro-MeOTAD interface. The IDD is varied in 7 logarithmic steps (10 12 cm -2 - 10 18 cm -2 ). Obtained results indicate the degradation in photovoltaic performance with increase in IDD. It has been noticed from the simulated results that power conversion efficiency (PCE) 22.96% to 16.58% with increase in IDD. The same impact is also observed on short circuit current density (JSC), open circuit voltage (vOC) and fill factor (FF), it decreases from 35.03 mA/cm 2 to 33.88 mA/cm 2 , 0.80 v to 0.61 v and 83.55 % to 79.92 % respectively.

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design of Low-Power Time-Domain Comparator for High-Speed Analog to Digital Converters

Design of Low-Power Time-Domain Comparator for High-Speed An...

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Modeling, Simulation & Intelligent Computing (MoSICom), International conference on

作者： N Sathish William M Pugsley Apurba Chakraborthy Central Engineering-FIP Marvell India. Pvt. Ltd Bengaluru INDIA Optical PHY Marvell Technology Italy S.r.l Pavia ITALY Department of EEE BITS-PILANI K K Birla Goa Campus GOA INDIA

ISBN: (数字)9798331533311

ISBN: (纸本)9798331533328

The comparator is a crucial component of an Analog-to-Digital Converter(ADC). In this work, we developed a power-efficient Time-Domain Comparator(TDC) for high-speed Data Converters. This circuit minimizes static power dissipation by using the Clock(CLK) to control the current-starved type inverter. The circuit operates on the principle of voltage-to-Time Conversion. The comparator effectively converts the analog input voltage into a time delay, creating a phase difference between the input and reference signals. When the input voltage(vIN) is higher than the reference voltage(vREF), the TDC produces a logic low at the output. If the input voltage(vIN) is lower than the reference voltage(vREF), the TDC produces a logic high at the output. The circuit is designed to operate at a speed of 1GHz with a supply voltage of 1v. It consumes 28uW of power and provides a FOM(figure of merit) of 28.03fJ/Conversion. The dead zone voltage measures 19mv with an average delay of 81pS. This circuit was designed using TSMC 12FF and simulated using Cadence virtuoso.

关键词： Time-frequency analysis voltage measurement Sensitivity Delay effects Frequency conversion Inverters Power dissipation Delays Logic Time-domain analysis

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Realization of Free Space optical Communication

Realization of Free Space Optical Communication

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Smart Systems for applications in Electrical Sciences (ICSSES), International conference on

作者： Preksha T v Gaganashree C Shilpa S P T N Chandrika Department of Electronics and Telecommunication Engineering Siddaganga Institute of Technology Tumakuru India

Free Space optical (FSO) communication is a wireless method that sends data via air using light. This paper describes the integration of a FSO communication system that is powered by solar energy. The transmitter and reception ends of the experimental setup are composed of an Arduino Uno board, a laser, and a solar panel, respectively. The goal of this study is to demonstrate the viability and efficiency of an FSO communication system that uses a laser and a solar panel. In the proposed FSO communication system, the microcontroller modulates and demodulates the data transmitted over the light beam and manages the laser and solar panel. Using an Arduino and a solar panel simplifies the system's design, lowers costs, and consumes less energy. According to test results, the system can reliably transmit data up to a distance of 10 meters with low bit error rates (BER). The proposed system is an attractive alternative to current FSO communication methods, which can be costly and cumbersome due to their complexity. The results of the experiments show that the proposed system can achieve dependable communication over short to medium distances, offering a promising wireless communication option in situations where conventional communication technologies are not practical. This paper demonstrates the implementation of an FSO communication system using a laser and solar panel, as well as its viability, effectiveness, and some of the potential industries it might be utilized in, such as healthcare, transportation, and telecommunications.

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A 92%-Efficiency Inductor-Charging Switched-Capacitor Stimulation System with Level-Adaptive Duty Modulation and Offset Charge Balancing for Muscular Stimulation 43

A 92%-Efficiency Inductor-Charging Switched-Capacitor Stimul...

引用

43rd Annual IEEE Custom Integrated Circuits conference, CICC 2022

作者： Eom, Kyeongho Lee, Han-Sol Park, Minju Lee, Hyung-Min Yang, Seung Min Choe, Jong Chan Hwang, Suk-Won Suh, Young-Woo School of Electrical Engineering Korea University Seoul Korea Republic of KU-KIST Graduate School Korea University Seoul Korea Republic of Korea University Ansan Hospital Department of Ophthalmology Korea Republic of

ISBN: (纸本)9781665407564

Implantable medical devices (IMD) with stimulation system-on-chip (SoC) have been essential techniques for disease treatments and rehabilitations. As neuromuscular stimulation injects a large amount of stimulus energy into the body, its energy efficiency and safety should be carefully considered, which otherwise damages cellular tissues. Conventional current stimulation suffers from large power losses across current sources. Even adopting the adaptive supply voltage, the stimulator efficiency is still limited below 60% [1]. The switched capacitor stimulation (SCS) system charges the capacitor and transfer its charges to the tissue, achieving stimulator efficiency up to 84% [2]-[4]. However, previous SCS systems only operate with AC input voltages directly from wireless power, which can be interrupted in loosely-coupled inductive links. To take advantages of using a rechargeable battery or a supercapacitor for reliable IMD operation, the SCS system that can efficiently operate with both DC and AC inputs is required. Also, more aggressive techniques to further improve stimulator efficiency and efficacy are highly needed. © 2022 IEEE.

关键词： System-on-chip

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Introduction of IoT Solutions to Business Processes at Locomotive Enterprises: Efficiency and Transformation of Social Communications

Introduction of IoT Solutions to Business Processes at Locom...

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International Science and Technology conference FarEastCon, 2021

作者： Gritskevich, T.I. Leukhova, M.G. Gagin, P.v. Kalichkin, K.K. Yakimova, N.S. Kemerovo State University 6 Krasnaya Str. Kemerovo650000 Russia "Locomotive Repair Company" Limited Liability Company 58-78 Olga Zhilina Str. Novosibirsk630005 Russia Siberian State Industrial University Bardin av. 25 Novokuznetsk654041 Russia

ISBN: (纸本)9789811688287

The paper focuses on the current challenges in the implementation of smart management processes (smart manufacturing) at Russian industrial enterprises engaged in cyclical repair of private railway locomotives. New vectors of IoT solution development set popular global trends and developments, which are present in the Russian market where companies meet the challenges of supporting industrial manufacturing technologies with automation, big data analytics, design, engineering, and modeling processes. The study focused on data obtained from financial and economic analysis of production indicators and through sociometry of production communications prior to IoT solutions and during the introduction of smart communications into smart manufacturing infrastructure at the locomotive repair facility. The core of the "smart" factory concept is the use of specialized software which, among other functions, facilitates the creation of corporate networks of interaction among employees and workers at certain stages of the production cycle. At present, the use of smart technologies in Russian industrial plants has many limitations;the main problems being the customization of the business model to introduce the smart technologies and software available at the market, which hinders the comprehensiveness of key solutions and the creation of a new analytic and management model based on the specific study of the production cycle. Both problems directly affect the transformation of familiar technological processes as they destroy unaccounted communications in the formation of new streams of action. Embedding smart communications into the business model revealed a number of persistent challenges, among which authors highlight the most relevant: the disruption of the existing corporate interactions among employees and the occurrence of intelligence errors in predicting the holistic outcome of the production process. © 2022, The Author(s), under exclusive license to Springer Nature Singapo

关键词： Data Analytics

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Characterization of a Fast Response Fiber-Optic pH Sensor and Measurements in a Biological Application 21

Characterization of a Fast Response Fiber-Optic pH Sensor an...

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conference on optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI

作者： Werner, Jan Belz, Mathias Klein, Karl-Friedrich Sun, Tong Grattan, K. T., v World Precis Instruments Germany GmbH Pfingstweide 16 D-61169 Friedberg Germany City Univ London Sch Math Comp Sci & Engn Northampton Sq London EC1V 0HB England Univ Appl Sci THM Wilhelm Leuschner Str 13 D-61169 Friedberg Germany

ISBN: (数字)9781510641068

ISBN: (纸本)9781510641068

optical, and especially fiber-optic techniques for the sensing of pH have become very attractive and considerable research progress in this field has been made over a number of years. The determination of the pH level across a broad range of applications today, e.g. in life sciences, environmental monitoring, industry and widely in biologically research is now accessible from such optical sensors. This arises because familiar sensors are often limited in terms of their response time and drift, which reduces the use of the current group of such fiber-optic sensors in wider applications. A new compact sensor design has been developed in this work, based on a specially-formed fiber-optic tip that was coated with a pH-sensitive dye, covalently linked to a hydrogel matrix to provide high stability. The sensor developed has a very fast response time (to 90% of saturation, Delta t(90)) of < 5 seconds, a sensing uncertainty of about +/- 0.04 pH units and given the covalently bonded nature of the dye, leeching is reduced and the probe is very stable over many days of use. During extended continuous use over similar to 12h in pH 7, this stability was confirmed, with drift of < 0.05 pH/h. Preliminary experiments in an important biological application, monitoring over pH levels from pH 5 to pH 8.5, are shown and discussed.

关键词： pH measurement fast response time fiber-optic optical fiber sensors fluorescence luminescence biomedical measurements

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Improve the performance of 2μm GaSb-based high-power lasers by reducing the thermal effect of series resistance 16

Improve the performance of 2μm GaSb-based high-power lasers...

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16th National conference on Laser Technology and Optoelectronics

作者： Chen, Yihang Zhang, Yi Yang, Cheng'ao Shang, Jinming Wang, Tianfang Wang, Haiteng Xu, Yingqiang Zhang, Yu Niu, Zhichuan State Key Laboratory for Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing100049 China CRRC YANGTZE CO. LTD China

ISBN: (数字)9781510646643

ISBN: (纸本)9781510646636

The resistivity of each layer constituting a 2μm GaSb-based laser is measured with van der Pauw method. The operation temperature of GaTe doping source is optimized for lower resistivity. The series resistance contribution of each layer is calculated. A new laser structure is designed, 65% of the optical field distributes in quantum wells and waveguide layers while the series resistance is reduced to 0.28ω.The laser with new design is fabricated, 0.89W continuous output power at room temperature can be achieved at a current of 3A with voltage of 1.40v. The slope efficiency of the emitter is 0.32W/A, and almost no slope efficiency is observed in the process of increasing current until 2.6A. © 2021 SPIE.

关键词： III-v semiconductors

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Front-End Computational Modeling and design for the Antarctic Demonstrator for the Advanced Particle-astrophysics Telescope 38

Front-End Computational Modeling and Design for the Antarcti...

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38th International Cosmic Ray conference, ICRC 2023

作者： Sudvarg, Marion Htet, Ye Chamberlain, Roger Buhler, Jeremy Bal, Blake Altomare, Corrado Serini, Davide Mazziotta, Mario Nicola Di venere, Leonardo Chen, Wenlei Buckley, James Chamberlain, Roger D. Bal, Blake Altomare, Corrado Serini, Davide Mazziotta, Mario Nicola Di venere, Leonardo Chen, Wenlei Buckley, James H. Atkeson, Ulysses Konst, Meagan Lang, Thomas Li, Shun Pacheco-Garcia, Diana Song, Nick Zhao, Chenfeng Zhou, Zhiting Andrew, Matthew Bose, Richard G. Braun, Dana Burns, Eric Cherry, Michael L. Dumonthier, Jeffrey Errando, Manel Funk, Stefan Ghosh, Priya Giordano, Francesco Hoffman, Jonah Hughes, Zachary Jung, Aera Kelly, Patrick L. Krizmanic, John F. Kuwahara, Makiko Licciulli, Francesco Liu, Gang Lorusso, Leonarda Mitchell, John Grant Mitchell, John W. de Nolfo, Georgia A. Panzarini, Giuliana Peschke, Richard Paoletti, Riccardo Pillera, Roberta Rauch, Brian Simburger, Garry Suarez, George Tatoli, Teresa varner, Gary S. Wulf, Eric A. Zink, Adrian Zober, Wolfgang v. Washington University in St. Louis Department of Physics McDonnell Center for the Space Sciences St. LouisMO United States Istituto Nazionale di Fisica Nucleare Sezione di Bari Bari Italy University of Minnesota Department of Physics and Astronomy MinneapolisMN United States Astroparticle Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Department of Computer Science & Engineering Washington University St. LouisMO63130-4899 United States Department of Engineering University of Hawai‘i at Mānoa HonoluluHI96822 United States Department of Physics and Astronomy Louisiana State University Baton RougeLA70803 United States Department of Physics and Astronomy University of Hawai‘i at Mānoa HonoluluHI96822 United States Department of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Department of Physics McDonnell Center for the Space Sciences Washington University St. LouisMO63130 United States Department of Physics Catholic University of America WashingtonDC20064 United States Dipartimento di Fisica "M. Merlin" dell’Università e del Politecnico di Bari BariI-70126 Italy Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Centre for Astroparticle Physics ErlangenD-91058 Germany Heliospheric Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Istituto Nazionale di Fisica Nucleare Sezione di Bari BariI-70126 Italy NASA Goddard Space Flight Center GreenbeltMD20771 United States Naval Research Laboratory WashingtonDC20375 United States Politecnico di Bari Department of Mechanics Mathematics and Management via Orabona 4 BariI-70125 Italy SLAC National Accelerator Laboratory 2575 Sand Hill Rd Mailstop 0094 Menlo ParkCA94025 United States Università di Siena INFN Pisa SienaI-53100 Italy

The Advanced Particle-astrophysics Telescope (APT) is a planned space-based observatory designed to localize Mev to Tev transients such as gamma-ray bursts in real time using onboard computational hardware. The Antarctic Demonstrator for APT (ADAPT) is a prototype high-altitude balloon mission scheduled to fly during the 2025–26 season. Gamma-ray-induced scintillations in CsI tiles will be captured by perpendicular arrays of optical fibers running across both tile surfaces, as well as SiPM-based edge detectors to improve light collection and calorimetry. Signal samples are captured by analog waveform digitizer ASICs then sent to the front end of the computational pipeline, which is designed to be deployed on a set of FPGAs. This paper presents a model for uncertainty in the measured positions and deposited energies of Compton scatters in ADAPT, informed by simulations of the scintillation response and optical propagation properties of the CsI tiles, as well as existing characterizations of the SiPM and preamplifier boards. Anisotropic background radiation and event pileup are also considered. We describe our current implementation of event processing and data reduction for individual gamma rays, including both pedestal subtraction and signal integration. Preliminary work shows that high-level synthesis (HLS) enables the logic for pedestal subtraction and signal integration across 96 ASIC channels to run in 302 clock cycles on a single Kintex-7 FPGA. This demonstrates the feasibility of using FPGA hardware to accelerate the front-end event-building stage prior to back-end reconstruction and localization. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Scintillation counters

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ANDES, the high resolution spectrograph for the ELT: project management and system engineering approaches for mastering its preliminary design phase 10

ANDES, the high resolution spectrograph for the ELT: project...

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conference on Modeling, Systems engineering, and Project Management for Astronomy X

作者： Di Marcantonio, P. Zanutta, A. Marconi, A. Abreu, M. Alberti, v Aliverti, M. Andersen, M., I Baldini, v Balestra, A. Baron, F. Brynnel, J. Cabral, A. Chazelas, B. Cirami, R. Coretti, I Gallo, E. Giro, E. Gaesslerk, W. Gonzalez, O. Huke, P. Kouach, D. Leao, I. C. Lunney, D. Macintosh, M. Mastowski, P. Monteiro, M. A. Oliva, E. Origlia, L. Pariani, G. Pinna, E. Redaelli, E. M. A. Riva, M. Selmi, C. Sortinor, F. Stempels, E. H. C. Wehbe, B. Xompero, M. Zimara, J. INAF Osservatorio Astron Trieste Via GB Tiepolo 11 I-34143 Trieste Italy INAF Osservatorio Astron Brera Via E Bianchi 46 I-23807 Merate Italy Univ Firenze Dipartimento Fis & Astron Via G Sansone 1 I-50019 Florence Italy Univ Copenhagen Niels Bohr Inst Blegdamsvej 17 DK-2100 Copenhagen O Denmark Univ Lisbon Fac Ciencias Inst Astrofis & Ciencias Espaco P-1749016 Lisbon Portugal INAF Osservatorio Astron Padova Vicolo Osservatorio 5 I-35122 Padua Italy Univ Montreal Inst Rech Exoplanetes Observ Mt Megant 1375 Ave Therese Lavoie Roux Montreal PQ H2V 0B3 Canada Leibniz Inst Astrophys Potsdam AIP Sternwarte 16 D-14482 Potsdam Germany Univ Geneva Observ Geneve 51 Chemin Pegasi CH-1290 Versoix Switzerland Univ Michigan Dept Astron 1085 S Univ Ann Arbor MI 48104 USA Max Planck Inst Astron Konigstuhl 17 D-69117 Heidelberg Germany STFC United Kingdom Astron Technol Ctr UK ATC Edinburgh EH9 3HJ Midlothian Scotland Georg August Univ Inst Astrophys & Geophys Friedrich Hund Pl 1 D-37077 Gottingen Germany Hsch Emden Leer Inst Laser & Opt Constantiapl 4 D-26723 Emden Germany Univ Paul Sabatier CNRS Observ Midi Pyrenees 14 V Ed Belin Belin F-31400 Toulouse France Univ Fed Rio Grande do Norte Dept Fis Teor & Expt Campus Univ BR-59072970 Natal RN Brazil Nicolaus Copernicus Univ Torun Fac Phys Astron & Informat Inst Phys Ul Grudziadzka 5 PL-87100 Torun Poland INAF Osservatorio Astron Brera Via Brera 28 I-20121 Milan Italy Uppsala Univ Dept Phys & Astron Box 516 S-75120 Uppsala Sweden Univ Porto Inst Astrofis & Ciencias Espaco CAUP Rua Estrelas P-4150762 Porto Portugal INAF Osservatorio Astrofis & Sci Spazio Via Gobetti 93-3 I-40129 Bologna Italy

ISBN: (纸本)9781510653566;9781510653559

At the end of 2021, the ESO council approved the start of the construction phase for a High Resolution Spectrograph for the ELT, formerly known as ELT-HIRES, renamed recently as ANDES (ArmazoNes high Dispersion Echelle Spectrograph). The current initial schedule foresees a 9-years development aimed to bring the instrument on-sky soon after the first-generation ELT instruments. ANDES combines high spectral resolution (up to 100,000), wide spectral range (0.4 mu m to 1.8 mu m with a goal from 0.35 mu m to 2.4 mu m) and extreme stability in wavelength calibration accuracy (better than 0.02 m/s rms over a 10-year period in a selected wavelength range) with massive optical collecting power of the ELT thus enabling to achieve possible breakthrough groundbreaking scientific discoveries. The main science cases cover a possible detection of life signatures in exoplanets, the study of the stability of Nature's physical constants along the universe lifetime and a first direct measurement of the cosmic acceleration. The reference design of this instrument in its extended version (with goals included) foresees 4 spectrographic modules fed by fibers, operating in seeing and diffraction limited (adaptive optics assisted) mode carried out by an international consortium composed by 24 institutes from 13 countries which poses big challenges in several areas. In this paper we will describe the approach we intend to pursue to master management and system engineering aspects of this challenging instrument focused mainly on the preliminary design phase, but looking also ahead towards its final construction.

关键词： ANDES astronomical instruments project management astronomical instruments system engineering ELT instrumentation high-resolution spectrograph high-precision spectrograph

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