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

共 530 条记录，以下是431-440 订阅

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design constraints of high-bit-rate soliton communication systems

Design constraints of high-bit-rate soliton communication sy...

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8th conference on current developments in optical design and optical engineering

作者： Ferreira, MFS Univ Aveiro Dept Phys P-3800 Aveiro Portugal

ISBN: (纸本)0819432652

We have examined the main constraints on the design of single-channel, high-capacity soliton communication systems. Ln the average soliton regime, the Gordon-Haus timing jitter limits the bit rate to less than 7 Gb/s for transoceanic fiber links, while for shorter transmission distances the main limitation is fiber perturbations arising from discrete in-line amplification. The use of dispersion-decreasing fibers and of periodic optical, phase conjugation for jitter control can increase significantly the capacity of soliton communication systems. We found that the third-order dispersion assumes a prominent role in this case. Reducing this effect sufficiently, the main constraint becomes the soliton-soliton interactions and bit rates superior to 110 Gb/s can be achieved for amplifier spacings less than 80 km. For higher amplifier spacings the bit rate is limited by the Raman induced timing jitter.

关键词： optical solitons optical communication systems nonlinear fiber optics

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optical design of the Next Generation Sky Survey (NGSS) Telescope

Optical design of the Next Generation Sky Survey (NGSS) Tele...

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8th conference on current developments in optical design and optical engineering

作者： Chrisp, MP Ball Aerosp & Technol Corp Boulder CO 80301 USA

ISBN: (纸本)0819432652

The Next Generation Sky Survey (NGSS) Telescope is a spaceborne cryogenic optical telescope with four channels covering the wavelength range 3.5 to 23 microns. The 0.5 m aperture telescope is based on a modified three mirror afocal design, with a scan mirror at the exit pupil compensating for the spacecraft motion. After the scan mirror, the light is spectrally split and focussed by three refractive camera systems onto four detector arrays. The nominal optical design exceeds the requirement of diffraction limited performance at 8 microns wavelength over the 1 degree by 0.5 degree field of regard.

关键词： optical design telescope infrared mirrors space cryogenic

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optical design of a visible and infrared survey telescope for astronomy

Optical design of a visible and infrared survey telescope fo...

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8th conference on current developments in optical design and optical engineering

作者： Atad-Ettedgui, E Casali, M Hawarden, TG Henry, DM Worswick, SP Royal Observ UK Astron Technol Ctr Edinburgh EH9 3HJ Midlothian Scotland

ISBN: (纸本)0819432652

A number of preliminary optical designs for a new generation of 4 metre astronomical survey telescopes have been investigated. These have large fields of view and operate in both the visible and near IR astronomical wavebands. Typical requirements for dual band systems of this type are presented. Two designs for prime focus refractive field corrector systems are presented, with and without aspheric surfaces. The use of aspheric surfaces on the field corrector lenses is shown to allow a large field of view (2 degrees diameter) to be achieved. A design for a three mirror reflective system is presented which also allows a 2 degrees field to be achieved. An infrared imager, based on a modified Schmidt camera, is presented which allows a 1 degrees field of view to be achieved. Additionally, a modified Ritchey-Chretien telescope, incorporating refracting field corrector lenses is presented. This design provides a large field of view over both the visible and lR wavebands. The mechanical constraints of combining these systems into dual channel systems are also discussed.

关键词： wide field astronomy survey telescope optical designs visible and infrared

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Full field mapping and analysis of veiling glare sources for Helmet Mounted Display systems

Full field mapping and analysis of veiling glare sources for...

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8th conference on current developments in optical design and optical engineering

作者： Hasenauer, DM Kunick, JM Opt Res Associates Pasadena CA 91107 USA

ISBN: (纸本)0819432652

The performance of an optical system can be degraded by the intrusion of stray light from sources both inside and outside of the system field of view. Stray light, or "veiling glare," can be particularly distracting in visual systems such as Helmet Mounted Display (HMD) systems. This paper describes techniques used by the authors to map stray light source positions in the far field for HMD systems and to quantitatively define their impact. The mapping can be performed over 4 pi steradians (i.e., over a full sphere) both inside and outside the system field of view. Monte-Carlo ray tracing algorithms are utilized for determining an effective source intensity distribution across the entire far field and a subtractive technique is utilized that separates the veiling glare component from the desired optical signal component. Once the major veiling glare source positions are identified, methods to reduce veiling glare can be determined. A technique for reducing noise in the calculation due to the statistical nature of the Monte Carlo ray trace is also discussed.

关键词： optical design illumination stray radiation stray light veiling glare LightTools (R)

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design of a day/night star camera system

Design of a day/night star camera system

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8th conference on current developments in optical design and optical engineering

作者： Alexander, CD Swift, W Ghosh, K Ramsey, B NASA George C Marshall Space Flight Ctr Dept Space Sci Huntsville AL 35812 USA

ISBN: (纸本)0819432652

This paper describes the design of a camera system capable of acquiring stars during both the day and night cycles of a high altitude balloon flight (35-42 km). The camera system will be filtered to operate in the R and I bands (similar to 600-1000nm), and simulations have been run using MODTRAN atmospheric code to determine the worse case sky brightness at 35km. With a worse case daytime sky brightness of 2x10(-5) W/cm(2)/sr/mu m at 600nm, the sensitivity of the camera system will allow acquisition of at least 1-2 stars/degrees(2) at star magnitude limits of 7.8-8.1. The system will have an F2.8, 64.3mm diameter lens and a 1340 x 1037 CCD digitized to 12 bits. The CCD is comprised of 6.8 mu m x 6.8 mu m pixels with a well depth of 45,000 electrons and quantum efficiency of 0.54 at 700nm. The camera's field-of-view will be 6.33 degrees(2) and provide attitude knowledge to 8 arcsec or better. A test flight of the system is scheduled for fall 1999.

关键词： star camera aspect system stratospheric balloon flights daytime star camera R band

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optical microscope for nuclear emulsion readout -: system design and results in application

Optical microscope for nuclear emulsion readout -: system de...

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8th conference on current developments in optical design and optical engineering

作者： Winkler, K Körner, L Gussek, P Balogh, I Breitfelder, S Schlichting, J Dupraz, JP Fabre, JP Panman, J Papadopoulos, IM Zucchelli, P Van de Vyver, B Syst GmbH Opt JENOPTIK Laser Jena Germany

ISBN: (纸本)0819432652

Experiments such as CHORUS at CERN require the inspection of a large amount of nuclear emulsion plates exposed to particle beams. Rare events need to be found, measured and analysed. Their features are stored as grains in microscopic dimensions in a three-dimensional stack of plates. A new, fully automatic immersion microscope system was developed for this purpose. It features high resolution, small depth of focus, large working distance, large field of view and synchronization of illumination and detector. An additional requirement is given by variations in the refraction index and in the relative thickness of immersion oil and emulsion. The approach used here is an imaging system based on a vario objective lens (variable oil immersion) with extreme numerical aperture, large working distance and wide field, combined with a matched high-aperture Koehler illuminator. The light source is a mercury are lamp, combined with a filter package for the g-line. It includes liquid crystal elements for synchronized shuttering and variable attenuation. The theoretical resolution is less than 1 micron in x, y, z within a volume of 0.5mm diameter (x, y) times 1 mm scanning depth (z) in all situations within a predefined index range (1.49 to 1.54). Three identical pieces of the system have been built. The experimentally measured resolution confirms the expectations and is better than 1 micron in all three dimensions. This is the result of a complex process of system design and manufacturing, unifying optical, opto-mechanical and optoelectronical contributions. This process spans from the early stages of feasibility and manufacturing up to the test and adjustment procedures. The three prototypes are operational since the fall of 1998 in the frame of the CHORUS project. Practical experience and application results are presented.

关键词： optical microscopy oil immersion nuclear emulsion readout variable immersion systems design

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Agile beam director system design (ROBS/TCATS optical tracker)

Agile beam director system design (ROBS/TCATS optical tracke...

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8th conference on current developments in optical design and optical engineering

作者： Neff, BW Trissel, RG Dunn, M Scotese, L Thermotrex Corp San Diego CA 92121 USA

ISBN: (纸本)0819432652

The ROBS (Rapid optical Beam Steering) tracking telescope was invented and developed at TTC to provide a high acceleration, large aperture beam steering system for rapid pointing to multiple objects. The optical system consists of a fast, oversized spherical primary mirror with the 50 cm aperture stop at the center of curvature of the primary mirror (CCP). A lightweight secondary mirror selects the instantaneous field of view by scanning over the petzval image surface of the primary mirror. The secondary mirror is gimbaled about the CCP on a rigid, lightweight mast. The system's symmetry about the CCP simplifies the optical and mechanical design and provides very rapid retargeting over a 30 degree field of regard for multiple target tracking. Field corrector and pupil relay optics inside the support tube collimate the light through coude' optics to passive sensors and laser radar optics. The 2-sphere, 2-asphere aplanatic, anastigmant all-reflective design corrects the 9.1 mr of spherical aberration from the F/1 primary and provides 10 microradian resolution over a 5 mr field of view. The system incorporates near field focus adjustment to provide high resolution imaging and laser ranging over a large volume of space. Two 50 cm systems have been built and demonstrated tracking multiple targets in the field. This paper describes the opto-mechanical design and demonstrated system capabilities.

关键词： telescope with spherical primary beam steering laser radar system optical tracker

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Computer modeling and analysis of veiling glare and stray light in Fresnel lens optical systems

Computer modeling and analysis of veiling glare and stray li...

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Proceedings of the 1999 current developments in optical design and optical engineering VIII

作者： Lamb, David J. Hillman, Lloyd W. Univ of Alabama in Huntsville Huntsville United States

Veiling glare (or flare) occurs in an imaging system when non-image forming flux strikes the focal surface. This light tends to reduce image contrast and can be caused by surface defects, dust, or anything else that might cause light to deviate from its intended imaging path. Fresnel lenses contain many such non-image forming structures as a result of their faceted and discontinuous nature. Sample optical systems for an extensive air shower observatory have been designed that consist of multiple Fresnel lenses. Veiling glare is expected to be significant in these systems, and it is desired to quantify its extent and ramifications. To this end, a series of tests has been performed on the Fresnel lens systems using non-imaging optical analysis software. A method for obtaining veiling glare information efficiently has been developed based upon the manner in which it is measured in real optical systems. By using computer software, the effects that several different parameters have on the veiling glare are analyzed independently without the use of expensive prototypes. It is shown that the amount of veiling glare is highly dependent upon the system configuration and that generalized conclusions regarding veiling glare and the number of Fresnel surfaces in a system are not possible. The analysis methods developed here, however, can be used to efficiently analyze the stray light in any system.

关键词： optical instrument lenses

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Revisions to the JDL data fusion model

Revisions to the JDL data fusion model

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conference on Sensor Fusion - Architectures, Algorithms, and Applications III

作者： Steinberg, AN Bowman, CL White, FE ERIM Int Inc Arlington VA 22209 USA

ISBN: (纸本)0819431931

The Data Fusion Model maintained by the Joint Directors of Laboratories (JDL) Data Fusion Group is the most widely-used method for categorizing data fusion-related functions. This paper discusses the current effort to revise and expand this model to facilitate the cost-effective development, acquisition, integration and operation of multi-sensor/multi-source systems. Data fusion involves combining information - in the broadest sense - to estimate or predict the state of some aspect of the universe. These may be represented in terms of attributive and relational states. If the job is to estimate the state of a people (or any other sentient beings), it can be useful to include consideration of informational and perceptual stares in addition to the physical state. Developing cost-effective multi-source information systems requires a method for specifying data fusion processing and control functions, interfaces, and associated databases. The lack of common engineering standards for data fusion systems has been a major impediment to integration and re-use of available technology: current developments do nor lend themselves to objective evaluation, comparison or re-use. This paper reports on proposed revisions and expansions of the JDL Data Fusion model to remedy some of these deficiencies. This involves broadening the functional model and related taxonomy beyond the original military focus, and integrating the Data Fusion Tree Architecture model for system description, design and development.

关键词： Data fusion Data modeling systems modeling Standards development Data processing Sensors Algorithm development Data analysis systems engineering Signal detection

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High magnification zoom lenses for 3-5 μm applications

High magnification zoom lenses for 3-5 μm applications

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conference on current developments in optical design and engineering VII

作者： Sinclair, RL Wescam Inc Flamborough ON L9H Canada

ISBN: (纸本)0819428841

Over the past twenty years numerous papers and patents have reported on the design of infrared zoom lenses for a variety of civilian and military applications. The vast majority of these lenses have been afocal 8-12 mu m zoom lenses with magnification ratios of five to twenty. With the advancement of 3-5 mu m staring focal plane array technology a growing demand has emerged for a compact imaging 3-5 mu m zoom lens. To meet this demand a variety of such zoom lenses have been designed which support image formats of over 10 mm diagonal. In this paper the preliminary design of a high magnification 3-5 mu m zoom lens is described. Infrared system modeling, detailed lens performance and manufacturing issues are reviewed.

关键词： infrared lens zoom lenses diffractive optical elements lens design

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