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High data-rate optical Communication Payload for CubeSats 9

High data-rate Optical Communication Payload for CubeSats

Conference on Laser Communication and Propagation through the Atmosphere and Oceans IX held at SPIE optical engineering + Applications Conference

作者： Roediger, Benjamin Menninger, Christian Fuchs, Christian Grillmayer, Lukas Arnold, Saskia Rochow, Christoph Wertz, Philipp Schmidt, Christopher German Aerosp Ctr DLR Inst Commun & Nav Muenchener Str 20 D-82234 Wessling Germany German Aerosp Ctr DLR German Space Operat Ctr Muenchener Str 20 D-82234 Wessling Germany Tesat Spacecom GmbH & Co KG Gerberstr 49 D-71522 Backnang Germany

ISBN: (数字)9781510638198

ISBN: (纸本)9781510638198;9781510638181

Space industry has undergone a significant change over the last years. The development moved from large and costly spacecrafts to cost-efficient designs and shorter development times. While the satellites became smaller, the resolution of high compact sensors increased which led to a high data-volume to be transmitted and increasing demands for higher data rates on small satellites. This motivated for a highly compact version of DLR's optical communication payload OSIRIS for small LEO satellites. DLR's Institute of Communications and Navigation has developed the OSIRIS (optical Space Infrared Downlink System) program starting with payloads on the satellites Flying Laptop of Univ. of Stuttgart and BiROS of DLR. Combining miniaturization to the flight-proven developments with novel concepts, OSIRIS4CubeSat allows integration in a standard CubeSat bus. The development of OSIRIS4CubeSat (industrialized under the product name "CubeLCT") is conducted in close collaboration with Tesat Spacecom, DLR's commercialization partner. The first implementation will be demonstrated within the PIXL-1-Mission on a 3Unit CubeSat. Furthermore, OSIRIS4CubeSat (O4C) has been chosen to support scientific missions together with university partners in the field of Quantum Key Distribution (QUBE). In the future, the modular design will enable extensions for optical inter-satellite links. This paper will give an overview about the development of the O4C payload and the current status of the PIXL-1Mission. Furthermore, it will show the adaptation of the payload for the scientific mission QUBE. Besides these projects, the paper will give an outlook for future extensions of the O4C payload and the necessity of high data-rates in other scenarios such as inter-satellite links.

关键词： OSIRIS Free-Space-Optics CubeSat Laser-Communication high data-rate

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Detector systems engineering for extremely large instruments 9

Detector systems engineering for extremely large instruments

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Conference on X-Ray, optical, and Infrared Detectors for Astronomy IX as part of SPIE Astronomical Telescopes + Instrumentation Conference

作者： George, Elizabeth M. Bezawada, Naidu Ives, Derek Mehrgan, Leander Accardo, Matteo Alvarez, Domingo Brinkmann, Martin Conzelmann, Ralf Cumani, Claudio Downing, Mark Engelhardt, Max Haug, Marcus Hopgood, Joshua Geimer, Christoph Iwert, Olaf Klein, Barbara Mandla, Christopher Mueller, Eric Ramsay, Suzanne Reyes, Javier Richerzhagen, Mathias Serra, Benoit Seidel, Matthias Stegmeier, Joerg Todorovic, Mirko European Southern Observ Karl Schwarzschild Str 2 D-85748 Garching Germany

ISBN: (纸本)9781510636965

The scientific detector systems for the ESO ELT first-light instruments, HARMONI, MICADO, and METIS, together will require 27 science detectors: seventeen 2.5 mu m cutoff H4RG-15 detectors, four 4K x 4K 231-84 CCDs, five 5.3 mu m cutoff H2RG detectors, and one 13.5 mu m cutoff GEOSNAP detector. This challenging program of scientific detector system development covers everything from designing and producing state-of-the-art detector control and readout electronics, to developing new detector characterization techniques in the lab, to performance modeling and final system verification. We report briefly on the current design of these detector systems and developments underway to meet the challenging scientific performance goals of the ELT instruments.

关键词： ELT detectors H4RG-15 CCD GEOSNAP

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optical and electrical simulation of single gaas nanowire/ge solar cells 2nd

Optical and electrical simulation of single gaas nanowire/ge...

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2nd International Conference on Energy Systems, Drives and Automations, ESDA 2019

作者： Kumar, Akshaya Samajdar, Dip Prakash Sachchidanand, V. Deparment of Electronics and Communication Engineering Indian Institute of Information Technology Design and Manufacturing JabalpurMadhya Pradesh482005 India

ISBN: (纸本)9789811550881

In this chapter, we perform a detailed analysis of the optical and electrical properties of GaAs nanowire (NW) over Ge bottom cell, which is significantly influenced by the structural morphology of the NWs. This necessitates the need for geometric optimization of the NWs to enhance the performance metrics of the solar cells. The absorption efficiency per unit volume over traditional bulk and thin-film counterpart are much improved due to the intrinsic antireflection, strong excitation of resonance modes, and optical antenna effects. We show that the diameter optimization of GaAs NW for a fixed D to P ratio of 0.5 resulted in an ideal short circuit current density of 42.32 mA/cm2 with the help of 3D Finite Difference Time Domain method under standard AM 1.5G illumination. The optimized photogeneration profile is then imported to the DEVICE Module for electrical simulation resulting in a PCE of 18.61%, which is significantly higher than its planar counterpart. © The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2020.

关键词： Open circuit voltage

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Test design for Identification from Full-Field Measurements: A Concise Review 1

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SEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2019

作者： Pierron, Fabrice Faculty of Engineering and Physical Sciences University of Southampton Southampton United Kingdom

ISBN: (数字)9783030300982

ISBN: (纸本)9783030300975

Full-field optical measurements like Digital Image Correlation or the Grid Method have brought a paradigm shift in the experimental mechanics community. While inverse identification techniques like Finite Element Model Updating (FEMU) or the Virtual Fields Method (VFM) have been the object of significant developments, current test methods, inherited from the age of strain gauges or LVDTs, are not generally well adapted to the rich information provided by these new measurement tools. This paper provides a short review of the research dealing with the design and optimization of heterogeneous mechanical tests for identification of material parameters from full-field measurements. © Society for Experimental Mechanics, Inc. 2020.

关键词： Inverse problems

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Consumer Electronic Optics: How Small a Lens Can Be Using Metasurfaces 20

Consumer Electronic Optics: How Small a Lens Can Be Using Me...

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Conference on current developments in Lens design and optical engineering XX

作者： Thibault, Simon Univ Laval Ctr Opt Photon & Lasers COPL Quebec City PQ Canada Immervis Inc Montreal PQ Canada

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Miniature optics are used in many applications and particularly in consumer optics for such products as webcams, mobile phones, automotive components, endoscopes, tablets, and many other connected devices. Mobile phone cameras are probably the ones that have driven the race for shorter TTL over the past 10 years. Ten years ago, cell phone cameras were composed of 3-4 optical plastic elements within one camera lens;today it takes more than 6 optical elements to obtain mega pixel resolution. But it is still not enough. The market has an insatiable appetite for greater optical performance. Consequently, the lens system has become more complex and now may require more optical elements with more complex optical functions. In this context, can the metasurface lens play a role? In this paper, we will try to address this question and discuss how metasurfaces promise to become a game changer in the consumer electronics market.

关键词： Lens design Metasurface Dielectric Nanofin Aberration Cell Phone Camera Phone

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Material selection for an achromatic and athermal design using the factor of determination on optical glasses 20

Material selection for an achromatic and athermal design usi...

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Conference on current developments in Lens design and optical engineering XX

作者： Lim, Tae-Yeon Kim, Kum-Ho Park, Sung-Chan Dankook Univ Dept Phys 119 Dandae Ro Cheonan Si 31116 Chungcheongnam South Korea

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

This study presents a new method for selecting a pair of optical glass and housing material to achromatize and athermalize a lens system, by use of the factor of determination for material selection. To effectively obtain an optimum combination for materials, we newly propose the sequential material selection method by introducing the factor of determination for material selection, which depends on the level of contribution to correct these aberrations and the availability to be used as a suitable material. Even though there are many cases for material combinations, we can sequentially identify the best pair of glass and housing materials by checking the factor of determination. Using this design approach, we efficiently obtain an achromatic and athermal system through an optimum combination of materials, over the specified ranges in temperature and waveband.

关键词： lens design athermalization achromatization graphic solution

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Evaluation of optimal thermo-optical properties for electrochromic windows in current and future climate scenarios: A multi-locations optimization

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Energy and Buildings 2025年 343卷

作者： Francesco Carlucci Alessandro Cannavale Ludovica Maria Campagna Francesco Fiorito Department of Civil Environmental Land Building Engineering and Chemistry Polytechnic University of Bari Bari Italy Department of Architecture Construction and Design Polytechnic University of Bari Bari Italy

The technological advancement of innovative electrochromic (EC) technologies is fuelling the spread of new devices characterized by different thermo-optical properties. This wide range of possibilities poses new questions regarding optimal EC properties to be considered in different contexts. This study aims to investigate the influence of different locations and the effects of climate change on the definition of the optimal thermo-optical properties of an EC window, controlled by a daylighting sensor, in an office building. Six locations (Larnaca, Brindisi, Madrid, Paris, Copenhagen, Kiruna) – characterized by different latitudes and climate conditions – combined with five climate scenarios (current, SSP1-2.6, SSP2-4.5, SSP3-7.0, SSP5-8.5) were selected to conduct genetic optimizations considering 5-genes genomes: i) solar heat gain coefficient (SHGC) in bleached and ii) coloured state, iii) visible light transmittance (VLT) in bleached and iv) coloured state and v) thermal transmittance. The results highlight that adopting wrong EC devices in certain climates can increase the total consumption up to + 39%; instead, optimized EC systems reduce the total consumption of nearly 8% (on average), compared with traditional windows, with a peak of nearly 13% in hot climates. In particular, SHGC plays a pivotal role, with low values – in both clear and dark configurations – suggested for warm climates while higher values are optimal in cold climates. Instead, optimal thermal transmittances tend to higher values in warm cities and lower ones in colder regions. Finally, the rising temperatures in future scenarios lead to increased energy consumption – except in very cold climates – without affecting significantly the optimal EC properties.

关键词： Climate change Electrochromic Responsive envelopes Architectural engineering Sustainable design Digital innovation

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A Laser Pumping Double-Light-Source Module with Photon-Recycling 20

A Laser Pumping Double-Light-Source Module with Photon-Recyc...

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Conference on current developments in Lens design and optical engineering XX

作者： Lin, Shih-Kang Su, Yu-Wen Lee, Xuan-Hao Yu, Yeh-Wei Yang, Tsung-Hsun Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Chungli 32001 Taiwan Feng Chia Univ Dept Opt & Photon Taichung 40724 Taiwan

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

We proposed a novel structure to perform photon recycling for a double-light-source illumination system pumped by a laser. In the design, two kinds of phosphor are located at the two focus of an elliptical reflective surface separately, after the phosphor on the first focus pumped by laser, the backward scattering light will refocus at the other phosphor layer at the second focus. The absorption spectrum of the second phosphor should fit that of the emission light by the first phosphor. When the emission spectrum covers red light, the whole system is a double-light-source module.

关键词： laser diode photon recycling head lamp optical design

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局域光场增强的量子阱红外探测器(特邀)

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红外与激光工程 2021年第1期50卷 78-89页

作者：刘畅王健左璇熊大元华东师范大学上海市多维度信息处理重点实验室上海200241 华东师范大学极化材料与器件教育部重点实验室上海200241

量子阱红外探测器是继碲镉汞红外探测器之后又一重要的可以在中、长波段和甚长波段工作的红外探测器件。它在长波红外探测、多色探测及其焦平面技术方面表现出比碲镉汞红外探测器更具特色的优势,对量子阱红外探测器的研究将在很大程度... 详细信息

量子阱红外探测器是继碲镉汞红外探测器之后又一重要的可以在中、长波段和甚长波段工作的红外探测器件。它在长波红外探测、多色探测及其焦平面技术方面表现出比碲镉汞红外探测器更具特色的优势,对量子阱红外探测器的研究将在很大程度上推动我国红外探测器技术的发展。这一探测器的突出优势是其材料均匀性好,制备技术成熟。但是由于量子效率偏低,且无法直接吸收垂直入射红外光,所以需要针对不同的红外探测波段,设计和制备各类光栅或微腔结构来进行光耦合及局域光场增强以有效提升探测器性能。如何更有效提升量子阱红外探测器的光耦合效率,降低暗电流,提高器件工作温度是仍然是目前研究的重点。文中着重介绍和总结了近5年来研究的局域光场增强的新型量子阱红外探测器,从提高探测器光耦合效率、降低器件暗电流和提高工作温度等方面重点讨论各种量子阱红外探测器的新结构和新机理,同时展望了这一探测器的未来发展方向。

关键词：量子阱红外探测器表面等离激元光耦合局域光场增强

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Method to determine refractive index by measurement of flat plates 20

Method to determine refractive index by measurement of flat ...

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Conference on current developments in Lens design and optical engineering XX

作者： Johnson, R. Barry Curley, Michael J. Alabama A&M Univ Dept Phys Chem & Math Coll Engn Technol & Phys Sci Huntsville AL 35811 USA Alabama A&M Univ Dept Elect Engn & Comp Sci Coll Engn Technol & Phys Sci Huntsville AL 35811 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

Minimal refractive index data in the near-infrared spectrum are available for optical plastics. Typically, refractive index measurements are made by fabricating a prism of candidate optical material and using appropriate metrology equipment. Few plastics are available in thicknesses adequate to fabricate appropriate size prisms;however, almost all optical plastics can be acquired in a flat plate form. The investigation considered two fundamental approaches to measure the refractive index by (i) rotating a flat plate and measure the beam displacement and ( ii) measuring the optical focal shift. The rotation method was determined not accurate enough. An optical focal shift method optical(n = t(optical)/t(mechanical)) was developed that utilized existing laboratory equipment. The shift of focus when the plastic plate sample was inserted was located by determining the position of maximum contrast of the projection of a Ronchi ruling target when illuminated by flux from a Cary Eclipse covering the spectral range of 550-975 nm. The instrumentation, data processing, and measurement performance are presented.

关键词： refractive index measurement metrology optical materials

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