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New detectors and detector architectures for high resolution optical sensor systems

New detectors and detector architectures for high resolution...

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7th International conference on Sensing Technology (ICST)

作者： Eckardt, Andreas Reulke, Ralf DLR German Aerosp Ctr Inst Opt Sensor Syst Berlin Germany

ISBN: (纸本)9781467352215;9781467352208

the Institute of optical Sensor Systems (OS) as member of the Robotics and Mechatronics Cluster of the German Aerospace Center (DLR) has more than 30 years experiences with high-resolution imaging technology. the technology changes in the development of detectors, as well as the significant change of the manufacturing accuracy in combination with the engineering research define the next generation of spaceborne sensor systems focusing on Earth observation and remote sensing. the combination of large TDI (time delay and integration) lines, intelligent synchronization control, fastreadable sensors and new focal-plane concepts open the door to new remote-sensing instruments. this class of instruments is feasible for high-resolution sensor systems regarding geometry and radiometry and their data products like 3D virtual reality. Systemic approaches are essential for such designs of complex sensor systems for dedicated tasks. the system theory of the instrument inside a simulated environment is the beginning of the optimization process for the optical, mechanical and electrical designs. Single modules and the entire system have to be calibrated and verified. Suitable procedures must be defined on component, module and system level for the assembly test and verification process. this kind of development strategy allows the hardware-in-the-loop design. the paper gives an overview about the current developments at DLR OS in the field of innovative sensor systems design for spatial and spectral high resolution remote sensing instruments.

关键词： Focal plane technology large TDI BTDI sensors sCMOS Focal Plane Earth observation instrument geometric accuracy radiometric accuracy instrument optimization process large focal plane high mechanical accuracy

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Recent developments with a prototype fan-beam optical CT scanner

Recent developments with a prototype fan-beam optical CT sca...

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7th International conference on 3D Radiation Dosimetry (IC3DDose)

作者： Campbell, W. G. Jirasek, A. Wells, D. Univ Victoria Dept Phys & Astron Victoria BC Canada BC Canc Agcy Vancouverisland Ctr Victoria BC Canada

the latest design of a prototype fan-beam optical computed tomography scanner is presented. A new beam creation system consists of a 635 nm laser diode module with variable, DC voltage-controlled beam intensity. A change in scanner alignment allows for the elimination of ring artefacts caused by data corruption that is spaced symmetrically across the detector array. these artefacts, as well as a pair of streaking artefacts caused by flask seams, are removed in sinogram space. A flask registration technique has been developed that allows for accurate, reproducible dosimeter placement. Protocol investigations with gel dosimeters have indicated the importance of: i) proper cooling techniques during gel manufacture, and ii) scanning the dosimeter while it is at room temperature. Latest reconstructions of a normoxic polymer gel dosimeter are presented as an indicator of current system performance.

关键词： Dosimeters

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Topology information based spare capacity provisioning in WDM networks

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8th International conference on Grid and Pervasive Computing, GPC 2013

作者： Hwang, Hoyoung Kim, Seung-Cheon Dept. of Multimedia Engineering Hansung University Korea Republic of Dept. of Information Communication Engineeging Hansung University Korea Republic of

ISBN: (纸本)9783642380266

For networksurvivability, recovery methods from link or node failures should be provided and spare capacity to perform recovery should be prepared on the network links. the efficiency of spare capacity provisioning is a key issue in survivable network design. In this paper, we studied topology information based capacity provisioning methods for WDM optical networks which are widly used as a backbone architecture of current *** the methods, the spare wavelengths are reserved to perform optical link protection using only topology information of a network without need to calculate the amount of on-going traffic of the network, thus provide simple and efficient spapre capacity planning. the basic idea of the topology information based methods is embedding virtual cycles to perform recovery on the network topology *** suggest a multiple ring-cover based spare capacity provisioning scheme and compare it with two other topology information based schemes called cyclic-double-cover and p-cycle. We provide performance analysis of the topology information based schemes by the numerical calculation using cut-sets of the topology graphs, and compare it with computer simulation results. © 2013 Springer-Verlag.

关键词： Recovery

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Femtosecond fiber timing distribution system for the linac coherent light source

Femtosecond fiber timing distribution system for the linac c...

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35th International Free-Electron Laser conference, FEL 2013

作者： Li, Heng Chen, Li-Jin Cheng, Haynes Pak Hay May, Justin E. Smith, Steve Muehlig, Kerstin Uttamadoss, Akshaya Frisch, Josef C. Fry, Alan R. Kärtner, Franz X. Bucksbaum, Philip H. Stanford PULSE Institute Stanford University Stanford CA United States Department of Physics Stanford University Stanford CA United States Department of Applied Physics Stanford University Stanford CA United States SLAC National Accelerator Laboratory Menlo Park CA United States Idesta Quantum Electronics LLC Newton NJ United States Department of Electrical Engineering Princeton University Princeton NJ United States Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA United States Center for Free-Electron Laser Science DESY University of Hamburg Hamburg Germany

ISBN: (纸本)9783954501267

We present the design and progress of a femtosecond fiber timing distribution system for the Linac Coherent Light Source (LCLS) [1-3] at SLAC to enable the machine diagnostic at the 10 fs level. the LCLS at the SLAC is the world's first hard x-ray free-electron laser (XFEL) with unprecedented peak brightness and pulse duration [1-3]. the time-resolved optical/x-ray pumpprobe experiments at this facility open the era of exploring the ultrafast dynamics of atoms, molecules, proteins, and condensed matter [4-6]. However, the temporal resolution of current experiments is limited by the timing jitter between the optical and x-ray pulses [7, 8]. Recently, sub-25 fs root mean squared (rms) jitter is achieved from an x-ray/optical cross-correlator at the LCLS [9], and external seeding is expected to reduce the intrinsic timing jitter [10, 11], which would enable full synchronization of the optical and x-ray pulses with sub- 10 fs precision. For such a technique, tight synchronization between seed and pump lasers needs to be implemented [12-16]. Preliminary test results of the major components for a 4 link system will be presented. currently, the system is geared towards diagnostics to study the various sources of jitter at the LCLS. Copyright © 2013 CC-BY-3.0 and by the respective authors.

关键词： Free electron lasers

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design and fabrication of the near-ultraviolet birefringent Solc filter for the NASA IRIS solar physics mission

Design and fabrication of the near-ultraviolet birefringent ...

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conference on current developments in Lens design and optical engineering XIII

作者： Berger, thomas Mudge, Jason Holmes, Buck Searcy, Paul Wuelser, Jean-Pierre Lemen, James Title, Alan Adv Technol Ctr Palo Alto CA 94304 USA

ISBN: (纸本)9780819492036

the NASA Interface Region Imaging Spectrograph (IRIS) mission is a Small Explorer (SMEX) satellite mission designed to study plasma dynamics in the "interface region" between the Sun's chromosphere and corona with high spatial, spectral, and temporal resolution. the primary instrument is a dual Czerny-Turner spectrograph fed by a 20-cm Cassegrain telescope measuring near-and far-ultraviolet (NUV, FUV) spectral lines in the ranges 133-141 nm and 278-283 nm. To determine the position of the slit on the solar disk, a slit-jaw imaging system is used. the NUV slit-jaw imaging system produces high spatial resolution images at two positions in the Mg II 280 nm spectral line complex using a birefringent Solc filter with two wide-band interference pre-filters for spectral order selection. the Solc filter produces a 0.36 nm full-width at half-maximum (FWHM) filter profile with low sidelobes and a peak transmission of 15% at 279.6 nm. the filter consists of two "wire grid'' polarizers surrounding 8 quartz waveplates configured in a modified Solc "fan" rotational pattern. the elements are optically coupled using DC200 silicon-based grease. the NUV Solc filter is sealed in a windowed cell to prevent silicon contamination of the FUV channel. the design of the sealed cell and assembly of the filter into the cell were among the most challenging optomechanical aspects of the IRIS spectrograph system.

关键词： Optics imaging birefringent filter near-ultraviolet far-ultraviolet satellite systems solar spectrum

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design and Manufacture of Light Collimator with Narrow View Angle

Design and Manufacture of Light Collimator with Narrow View ...

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4th International conference of Asian-Society-for-Precision-engineering-and-Nanotechnology (ASPEN 2011)

作者： Joo, Jea Young Park, Jung Wok Park, Soon Sub Song, Snag Bin Korea Photon Technol Inst New Lighting Solut R&D Sect Kwangju South Korea Korea Inst Ind Technol Honam Technol Serv Div Kwangju South Korea

ISBN: (纸本)9783037854280

the use of LED for illumination offers significant advantages, such as lower power consumption, longer lifetime and improved colour management. Sharp gradients in luminous intensity patterns of LED are commonly controlled by the use of secondary optics that are mostly axisymmetric. In the current study, we proposed LED secondary optics forming non-axisymmetric luminous intensity distribution with an extremely narrow view angle. the proposed secondary optics dramatically reduced the view angle of the LED, with a view angle (<= 10 degrees) in full width at half maximum (FWHM) in simulations. Afterward, a prototype of the proposed lens was machined by single point diamond turning (SPDT). Luminous intensity distribution of the machined lens was off by about 8 from the optical axis and maintained a view angle of 12 degrees. the peak luminous intensity was folded more than thirty-two times. the proposed lens showed high optical performance and can be used for specialized optical applications.

关键词： light emitting diode illumination collimator lens

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thoughts on the application of digital substation

Thoughts on the application of digital substation

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International conference on Computing and Networking Technology (ICCNT)

作者： Jie Yue Mingzhan Zhao Qinglin Wang Hebei University of Architecture Zhangjiakou Hebei CN Hebei Institute of Architecture Civil Engineering Zhangjiakou china

Digitized substation is the substation automation technology of the popular development direction, compared with the traditional transformer substation equipment, equipments and information system has had a great changes. In the faster and faster pace of digital process, the actual application also comes across the problem such as design and construction. these problems prompted us to experience the superior performance of digital more comprehensive understanding of the nature of the digital, to better serve the safety in production, promote modernization substation management development.

关键词： current measurement optical variables measurement Instruction sets Substations optical fiber devices Monitoring optical fibers

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design improvement of a buffered SOA-based ultrafast all-optical half adder with PolSK modulated signals

Design improvement of a buffered SOA-based ultrafast all-opt...

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8th International conference on High-Capacity optical Networks and Emerging Technologies, HONET 2011

作者： Ahmadi, Hamed Kaatuzian, Hassan Photonics Research Lab. Electrical Engineering Dept. Amirkabir University of Technology Tehran Iran

ISBN: (纸本)9781457711695

In this paper, we analyze and improve a modern structure optical design for an ultrafast all-optical half adder. this design is based on four wave mixing (FWM) in a semiconductor optical amplifier (SOA), with polarization-shift-keying (PolSK) modulation input signals. For analyzing the amplifier we use a finite-difference method based on solution of the traveling wave equations. In this study, we have shown that the output signal power of the device increases with the length of the SOA section and current injection. © 2011 IEEE.

关键词： Finite difference method

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Green backbone optical networks: the way forward

Green backbone optical networks: The way forward

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8th International conference on Information, Communications and Signal Processing, ICICS 2011

作者： Shen, Gangxiang Deng, Jing Ho, Pin-Han School of Electronic and Information Engineering Soochow University Suzhou China Electrical and Computer Engineering University of Waterloo Waterloo Canada

ISBN: (纸本)9781457700309

optical transport networks have been considered as one of the dominant energy consumers in the modern Internet, wherein the design toward green communication with awareness of energy saving has received growing attention from both industry and academia. this article reviews green designs in the Internet optical transport backbone, particularly on the current progresses in the development of various energy-saving strategies, such as optical bypass configurations and turning off (or sleeping) equipments, as well as the impact on network survivability and security, and renewable energy use. the article will also discuss how the network control plane should be extended to support the energy-saving functionality in the context of Generalized Multi-Protocol Label Switching (GMPLS). © 2011 IEEE.

关键词： Energy conservation

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current and next-generation passive optical networks monitoring solution

Current and next-generation passive optical networks monitor...

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8th International conference on High-Capacity optical Networks and Emerging Technologies, HONET 2011

作者： Esmail, Maged Abdullah Fathallah, Habib King Saud University Riyadh Saudi Arabia Electrical and Computer Engineering Department Laval University QC Canada

ISBN: (纸本)9781457711695

In order to enable new services that require high data rates over longer distances, the optical fiber substitutes the copper cable step by step in the access network area. Time division multiplexed Passive optical network (TDM-PON) is a fast emerging architecture that uses passive components only between the customer and the central office. PON operators need a monitoring system for the physical layer to guarantee high service quality. this monitoring system is necessary during the fiber installation, final testing, regular operation of the network, and for fault localization. In this paper, we present our monitoring system based on optical coding for PON maintenance. this system has almost all the monitoring features required by a network operator. We explained the design and the principle operation of the technique. Moreover, we presents a management and protection solution for long-reach PON networks. Our system design achieves high reliability performance with almost half the cost if full network protection is used. © 2011 IEEE.

关键词： Monitoring

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