- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
System Design for High-Capacity Unrepeatered Optical Transmission
摘要： By basing the figure of merit on the joint evaluation of signal BER and OSNR, the design of single-carrier 400G unrepeatered optical systems using remote optically-pumped amplifiers (ROPAs) with dedicated delivery fiber is discussed and analyzed in this work. Simulation results show very good agreement with experimental measurements, proving the effectiveness of the proposed approach in critical transmission situations.
关键词： remote optically-pumped amplifier (ROPA),distributed Raman amplifier (DRA),optical system design,Unrepeatered coherent transmission
更新于2025-09-23 15:22:29
-
[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Lighting Design Using Ray Tracing
摘要： This article describes lighting system design using ray tracing. This method can be applied in cases where calculation includes non-diffuse reflective materials, light sources have dimensions comparable to distances from reflective materials and also in case where diffused reflective surfaces influence each other in terms of distribution of light.
关键词： illumination,luminaire,ray tracing,lighting system design
更新于2025-09-23 15:21:21
-
Performance evaluation and optimization of the cooling system of a hybrid thermionic-photovoltaic converter
摘要： Hybrid thermionic-photovoltaic (TIPV) converters are efficient and clean solutions for the direct conversion of thermal energy to electricity, taking advantage of both the photovoltaic and thermionic phenomena. An important hurdle for their efficient operation is the overheating of the PV cell integrated within the TIPV anode, due to partial conversion of the emitted electron and photon fluxes to thermal heat. This obstacle needs to be overcome with an efficient, yet practical, cooler. In this work, a copper plate heat spreader is experimentally tested for TIPV cathode temperatures up to 1450 °C, whilst its performance is also assessed using a validated CFD model for temperatures up to ~2000 °C. A multi-parametric analysis is conducted testing two coolants: i) a water/ethylene glycol mixture at various temperatures (?5–40 °C) and mass flow rates (0.05–0.4 kg·s?1), and, ii) cryogenic liquid nitrogen at a temperature of ?196 °C and mass flow rate of 0.074 kg·s?1. Numerical results reveal that with water/ethylene mixture the PV can withstand heat fluxes up to 360 W·cm?2, without its temperature exceeding 100 °C. For higher thermal fluxes (360–600 W·cm?2), cryogenic liquid nitrogen is found to prevent the PV overheating and, therefore, is an attractive coolant; however, it poses safety concerns due to its possible boiling. Finally, two additional cooling system designs are proposed, a heat sink with straight fins and another with copper pipes, which offer higher heat transfer areas, but are more difficult to manufacture, than the copper plate heat spreader.
关键词： Ultra-high power density,Copper plate heat spreader,Cooling system design optimization,Electronic device,Computational fluid dynamics (CFD)
更新于2025-09-23 15:21:01
-
Photonic Design, Verification, and Implementation
摘要： The requirement of different sectors such as healthcare, telecommunications, and industry for new systems that will provide higher performance and lower foot-print has triggered the development of many new photonic-based solutions. A key aspect of the development of an optical system is the design and verification before its production to reduce failure and, as consequence, the time-to-market. There are commercial software solutions able to simulate and to analyze the packaging of optical systems, photonic integrated circuits (PICs) based devices, transmission systems & networks, and fiber-optic lasers & amplifiers. Also, it is possible to take into account thermal and mechanical issues by multiphysics simulations. In this article, we explore the different available solutions to simulate your optical design before the production at the component level including free-form optics and photonic integrated circuits (PICs) and also at the system level.
关键词： photonic integrated circuits,multiphysics simulations,photonic-based solutions,optical system design
更新于2025-09-23 15:21:01
-
Automated <i>E-FRET</i> microscope for dynamical live-cell FRET imaging
摘要： Acceptor-sensitized 3-cube fluorescence resonance energy transfer (FRET) imaging (also termed as E-FRET imaging) is a popular fluorescence intensity-based FRET quantification method. Here, an automated E-FRET microscope with user-friendly interfaces was set up for dynamical online quantitative live-cell FRET imaging. This microscope reduces the time of a quantitative E-FRET imaging from 12 to 3 seconds. After locating cells, calibration of the microscope and E-FRET imaging of the cells can be performed automatically by clicking “Capture” button on interfaces. E-FRET imaging was performed on the microscope for living cells expressing different FRET tandem constructs. Dynamical E-FRET imaging on the microscope for live cells co-expressing CFP-Bax and YFP-Bax treated by staurosporine (STS) revealed three Bax redistribution stages: Bax translocation from cytosol to mitochondria within 10 minutes, membrane insertion with conformational change on mitochondrial membrane within about 30 minutes, and subsequent oligomerization within about 10 minutes. Because of excellent user-friendly interface and stability, the automated E-FRET microscope is a convenient tool for quantitative FRET imaging of living cell.
关键词： FRET,biochemical signal transduction,system design,microscope
更新于2025-09-19 17:15:36
-
[IEEE 2018 IEEE International Conference on Information and Automation (ICIA) - Wuyishan, China (2018.8.11-2018.8.13)] 2018 IEEE International Conference on Information and Automation (ICIA) - Design of Combined Receiving Lens for Panoramic Laser Fuze Detection
摘要： At present, the coaxial laser system is widely used in the panoramic laser fuze receiving optical system. The lens used for the coaxial laser system have the problems that the length is too long, the volume is large, and the adjustment is difficult. combined lens with multiple plastic lenses are designed. The parallel light passes through the combined lens and is refracted by the photosensitive surface of the photodetector. It overcomes the paradox between the size , shape of the photosensitive surface and the sector field of view, achieves the design with large receiver aperture and large field of view receiver optics. Specific design examples are given , geometric model and optical simulation are performed. The simulation results show that the optical efficiency of the system with combined lens reaches 83.037%, and a strict 90° detection angle can be generated, and the feasibility of the design is verified. The research can provide a reference for a large detection angle with a small-sized optical receiving system.
关键词： Laser Optics,Combined Lens,Panoramic Detection,Optical Receiving System Design
更新于2025-09-16 10:30:52
-
Scanning laser triangulation sensor geometry maintaining imaging condition
摘要： This work deals with the system design, control and the experimental results of a scanning laser sensor in which the optical path is scanned by a novel high performance compact fast steering mirror (FSM). The system design satisfies the Scheimpflug condition even though only the illumination path is scanned, such that an FSM with a small aperture size and high bandwidth can be used. To scan the area of interest with the FSM, raster trajectories are employed, which provide an uniform spatial resolution over the scan area. To track the trajectory a feedback controller is designed using the H-approach, such that a closed loop bandwidth of 1.4 kHz is achieved. The FSM can follow triangular signals up to 200 Hz with the maximum actuation range of ±3?. This enables a framerate of up to two frames per second for an image with 100x100 pixels. With the scanning system a maximum spatial resolution of 60 μm and a scan range of 25 mm can be achieved.
关键词： Optical Sensing and Sensors,Precision measurements,Laser Sensor,Fast Steering Mirror,Scheimpflug Condition,3D Sensor,Absolute measurement,System Design
更新于2025-09-16 10:30:52
-
A Novel Fire Control System for Distributed Photovoltaic Station
摘要： Stimulated by the worldwide construction of distributed photovoltaic (PV) power stations, the importance of safety control including fire detection and electrical shut-down for protection of personnel has been seriously considered by this community. In this paper, we propose a novel design strategy of safety control system for fire emergency detection and protection of PV stations. It can reduce the accumulation of DC voltage based on a three-level control system including high temperature detection and electrical short-circuit switch with active and passive operation modes. The system has a simple and reliable structure, and does not require a large control network rearrangement. In the future, it can be further upgraded by developing according algorithms for 24-hour automatic protection, as well as combination with fire-fighting robots to reduce personnel injuries, therefore it gives rise to an effective platform to tackle the future safety control of PV power station.
关键词： system design,automatically shut off,fire emergency control,Distributed PV station
更新于2025-09-12 10:27:22
-
Economic and Resilience Benefit Analysis of Incorporating Battery Storage to Photovoltaic Array Generation
摘要： Power systems with photovoltaic (PV) arrays combined with battery backup storage are becoming increasingly used because of their capability of working in power island mode, especially during grid outages. The problem is to decide the optimal battery sizes for PV + battery systems with given solar array sizes, from both power supply reliability and economical perspectives. An optimization method based on the simulation of system operation during grid interruption is developed to investigate the effects of battery size on system output reliability level of meeting load demand with minimum cost. Case studies are conducted for validation according to actual solar irradiation data, load profiles and realistic power interruption statistics. Sensitivity analysis is also performed to explore how system total cost affects islanding capability of a PV + battery system to supply energy to facilities. The finding shows that the decline of battery price not only reduces the lowest system total cost but also improves islanded system generation reliability. The proposed methodology for optimizing battery capacity added to PV array systems can make them grid-outage resilient and economically viable, which can be utilized as a decision-making tool for future PV + battery system expansion.
关键词： Resilient power systems,Resilience,Photovoltaic power island system,Battery backup systems,System design optimization,Solar power storage
更新于2025-09-10 09:29:36
-
[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A Novel Cognitive Neuromorphic Polarimetric Dynamic Vision System (pDVS) with Enhanced Discrimination and Temporal Contrast
摘要： In this preliminary study, a new cognitive vision architecture of a Polarimetric Dynamic Vision Sensor ( pDVS), is presented. The system consists of a neuromorphic camera coupled to polarization filters; a spinning wheel, namely, a light modulating wheel, operating at different speeds, is placed in front a static object. The detector system performance against different modulating speeds, under unpolarized and polarized conditions, has been tested, data were acquired and then analyzed. The outcome of this study indicates that enhanced temporal contrast resolution can be achieved, while offering unique discrimination capabilities, depending upon the light polarization states.
关键词： high-discrimination-based on light polarization states,target system design,visual information processing,high-temporal contrast,neuromorphic cognitive spike event-based Polarimetric Dynamic Vision Sensor (pDVS)
更新于2025-09-10 09:29:36