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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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optical design for imaging spectroscopy

Optical design for imaging spectroscopy

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conference on current developments in Lens design and optical engineering Iv

作者： Mouroulis, P Green, RO CALTECH Jet Prop Lab Pasadena CA 91109 USA

design examples are given for imaging spectrometer systems operating in the solar reflected spectrum. design considerations and procedures are outlined for incoherently and coherently coupled systems. The case of a pa... 详细信息

ISBN: (纸本)0819450464

关键词： optical design imaging spectroscopy concentric spectrometers convex/concave gratings

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Replication optics for a holographic 3D display system

Replication optics for a holographic 3D display system

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conference on current developments in Lens design and optical engineering Iv

作者： Wood, A Smith, M Stanley, M Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819450464

The display of 3D images containing all the depth cues required by the human vision system can be achieved using a reconfigurable Computer Generated Hologram (CGH) with high pixel count. A technique which has been developed to produce CGH's with the required number of pixels, and at video refresh rates, is known as Active Tiling((TM)) (AT). At the heart of an AT system is a set of replication optics which produces multiple images of a Spatial Light Modulator (SLM) onto the CGH. The design of two alternative optical systems for generating a 5x5 tiled array of de-magnified images of a single object is discussed. Results are presented from a 4-channel AT system which has recently been built and demonstrated.

关键词： optical design computer generated holograms 3D display

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current status and future direction of sensors in earth observing satellites

Current status and future direction of sensors in earth obse...

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conference on current developments in Lens design and optical engineering Iv

作者： Zhou, GQ Wang, C Old Dominion Univ Norfolk VA 23529 USA

ISBN: (纸本)0819450464

With the increasing sensor development, smart sensor, advanced sensor, and intelligent sensor, especially, distributed sensors, sensor network and sensor integration are being taken into account for application of our environmental monitoring and Earth source investigation. This paper investigates the development of sensors in Earth observing (EO) satellites, analyzes the current high-resolution EO satellites and presents the direction of new imaging systems in future Earth observing satellite. The purpose of this paper is to contribute to those who are interested in knowing and keeping track of the details of the imaging system of earth observing satellites.

关键词： sensor network earth observing satellite future direction advanced sensor smart sensor

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Integral optical system design of injection molded optics

Integral optical system design of injection molded optics

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conference on current developments in Lens design and optical engineering Iv

作者： Bäumer, S Shulepova, L Willemse, J Renkema, K Philips High Tech Plast NL-5503 LP Veldhoven Netherlands

ISBN: (纸本)0819450464

Injection molded optics are frequently applied in many high volume applications. Bar code scanners.. CD / DvD systems, CMOS cameras are a few examples. In all of these applications cost effective and fast design cycles are essential. At Philips High Tech Plastics we developed a design system that touches on all different aspects of the system design. Starting with traditional lens design (sequential ray tracing) and tolerancing we transport the initial design into mechanical solid modeling. During mechanical modeling, tolerances, injection molding design rules and integration of mechanical features, reference marks, etc. are incorporated as well. Here the full advantage of injection molding can be utilized. After the opto - mechanical modeling the system is ported back to non - sequential ray tracing for ghost - and stray light analysis. Finally extended tolerancing is performed in order to come to a robust high volume product. If necessary all or several steps in this design process are repeated in order to arrive at the final design. As an additional requirement the metrology possibilities for the design are checked at an early stage. This integral system approach to optical design, including optical modeling (sequential and non-sequential) combined with mechanical solid modeling is presented using some recent examples.

关键词： injection molding imaging optics optics design

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A new method to treat a spherical lens as a combination of two perpendicular lengthless cylindrical lenses in ray tracing

A new method to treat a spherical lens as a combination of t...

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conference on current developments in Lens design and optical engineering Iv

作者： Al-Ali, LS Rasheed, KH Ajman Univ Sci & Technol Ajman U Arab Emirates

ISBN: (纸本)0819450464

We present a new suggestion for treating skew rays. In the new suggestion. we hypothetically divide a spherical lens. at each point of intersection of the incident rays with the spherical lens. into two effective perpendicular lengthless cylindrical lenses. One of the hypothetical cylindrical lenses is effective in the vertical direction while the other is effective in the horizontal direction. A method is given for calculating the resulted vertical and horizontal angles of refraction. After calculating these angles one can combine. at that point of incidence. the two components into a vector sum to find the resultant refracted ray. The new suggested method is first discussed and demonstrated for one single lens. and then generalized to optical systems of many components. The method's power and effectiveness in lens and optical systems design is demonstrated. A software package is designed and written for the purpose of optical ray tracing. The new method is implemented in this software. The name we gave to this package is "CALOSD". CALOSD is an acronym for Computer Aided Lens and optical Systems design. CALOSD is capable of producing very accurate tabulated data as well as graphical displays of an optical system and rays traced from different points or angles of view: including a top view.

关键词： lens design ray tracing meridian and skew rays approximate and exact methods

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optical design and tolerances of wide field imagers for astronomical survey

Optical design and tolerances of wide field imagers for astr...

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conference on current developments in Lens design and optical engineering Iv

作者： Thibault, S Lacoursière, J Doucet, M Wang, M Reecht, J INO St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819450464

We present three designs and tolerances of wide-field imagers (30x30 arc-minutes or larger) for astronomical surveying. Two infrared cameras (CPAPIR and PANORAMIX II) were designed for the 0.8-2.4 mum band and a third one (WIRCAM) for the visible and near-infrared band extending from 410 nm to 950 nm. The cameras are installed on the telescopes of the Canada-France-Hawaii (Hawaii, USA) and Mont Megantic Observatories (Quebec, Canada). The three cameras are compact, use only spherical refractive components and have an internal pupil accessible for insertion of filtering components. A Lyot stop must be used in the infrared camera for background rejection. For PANORAMIX II, a set of filters is used at the internal pupil. Correction of the large off-axis aberrations generated by the telescopes, wide spectral coverage, material choices, cryogenic temperature and alignment were the main design challenges. Also, tolerancing was particularly critical for the infrared cameras because they are cryogenically cooled, thus forbidding adjustment of internal components. The cameras theoretical performances are presented in terms of point-spread function, encircled energy and distortion.

关键词： optical design wide field focal reducer broadband astronomical survey catadioptric

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Structured design method for automotive lamp reflectors

Structured design method for automotive lamp reflectors

引用

conference on current developments in Lens design and optical engineering Iv

作者： Sikkens, M Nuyens, P Philips Ctr Ind Technol Ind Opt Grp NL-5600 MD Eindhoven Netherlands

ISBN: (纸本)0819450464

The design of critical automotive lamp reflectors, e.g. headlamps and fog lamps, is dominated by trial-and-error methods and rules-of-thumb, supported by optical ray-tracing tools like ASAP etc. In many cases these reflectors are designed by aiming small sections to construct the required illumination distribution, which is a time-consuming task and in which case it is very difficult to maintain a continuous reflector surface. The design method presented here is a more structured approach in which the total available front surface is divided in a few relatively large sections, each section designated to produce a certain part of the required light distribution. An optimizing algorithm is used to optimize the separate polynomial reflector sections in combination with a specific burner. In the final step, the separate sections are put together to form a more-or-less continuous reflector surface. Some iteration afterwards is still required because the intersection lines of the polynomial surfaces will generally change the original section boundaries. The design of a front fog reflector lamp is used as a carrier to demonstrate the approach. Three reflector sections are used to design a high-efficiency fog lamp. The light distribution has an excellent horizontal cut-off that basically meets the SAE requirements.

关键词： reflector design lamps automotive head lamp fog lamp optimization

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design of an imaging vISAR diagnostic for the national ignition facility (NIF)

Design of an imaging VISAR diagnostic for the national ignit...

引用

conference on current developments in Lens design and optical engineering Iv

作者： Malone, RM Frogget, BC Kaufman, MI Watts, PW Bell, PM Celester, JR Bechtel Nevada Los Alamos NM 87544 USA

ISBN: (纸本)0819450464

The National Ignition Facility (NIF) requested an optical diagnostic for measuring shock velocities, shock breakout times, and shock emission of objects with sizes of I to 10 mm. For the polar port of the target chamber, an 8-inch triplet lens collects light at f/3 inside a 30-foot-diameter vacuum chamber and uses an optical relay to send the image into two interferometers located at a distance of 160 feet. Light propagates through a vISAR (velocity Interferometry System for Any Reflector) interferometer employing a Mach-Zehnder configuration. After exiting the interferometers the images are recorded, both by streak cameras and CCD gated imagers. Discrete magnification changes are accomplished by swapping out optical elements. Large dove prisms are used to rotate the image to align a selected region of the object with the slits of the streak cameras. Unique mounting structures are required to remotely control the alignment of the optical axis. Finite Element Analysis (FEA) was performed on all mounting structures. The first 8-inch triplet can be no closer than 500 mm from the target chamber center and is protected by a blast window that has to be replaced after every event. The first several lens groups have to be fused silica for radiation resistance. A frequency-doubled Nd:YAG laser, operating at 659.5 nm, is used to illuminate the moving object. The vISAR laser wavelength had to be different than the first, second, and third harmonics of the NIF drive lasers.

关键词： optical relay interferometer national ignition facility (NIF) vISAR streak camera

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Photogrammetry in the line:: Recent developments in industrial photogrammetry

Photogrammetry in the line:: Recent developments in industri...

引用

conference on optical Measurement Systems for Industrial Inspection III

作者： Bösemann, W AICON 3D Syst GmbH D-38114 Braunschweig Germany

ISBN: (纸本)0819450146

In recent years industrial photogrammetry has emerged from a highly specialized niche technology to a well established tool in industrial coordinate measurement applications with numerous installations in a significantly growing market of flexible and portable optical measurement systems. This is due to the development of powerful, but affordable video and computer technology. The increasing industrial requirements for accuracy, speed, robustness and ease of use of these systems together with a demand for the highest possible degree of automation have forced universities and system manufacturers to develop hard- and software solutions to meet these requirements. The presentation will show the latest trends in hardware development, especially new generation digital and/or intelligent cameras, aspects of image engineering like use of controlled illumination or projection technologies, and algorithmic and software aspects like automation strategies or new camera models. The basic qualities of digital photogrammetry- like portability and flexibility on one hand and fully automated quality control on the other - sometimes lead to certain conflicts in the design of measurement systems for different online, offline or real-time solutions. the presentation will further show, how these tools and methods are combined in different configurations to be able to cover the still growing demands of the industrial end-users.

关键词： industrial photogrammetry close range mobile industrial application 3D point measurement

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Energy level engineering in InAs quantum dot stacks embedded in AlAs/GaAs superlattices

Energy level engineering in InAs quantum dot stacks embedded...

引用

International conference on Superlattices Nano-Structures and Nano-Devices (ICSNN-02)

作者： Rebohle, L Schrey, FF Hofer, S Strasser, G Unterrainer, K Vienna Tech Univ Inst Festkorperelekt A-1040 Vienna Austria

We present a new method to design the energy level scheme of quantum dot (QD) structures by combining band gap engineering with the self-organized growth of (QDs). With the embedding of QDs in two-dimensional supperlattices optical transition energies, ionization energies and the absorption properties of this system can be adjusted.. This scheme. is applied for novel photodetectors made of InAs QDs embedded in an AlAs/GaAs superlattice, and the absorption energy is tailored by changing the superlattice period. Moreover, the dark current of these devices is reduced by more than one order of magnitude compared to devices without a superlattice. (C) 2002 Elsevier Science B.v. All rights reserved.

关键词： quantum well devices photodetectors optical properties of quantum dots

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