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

共 444 条记录，以下是411-420 订阅

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Reflectivities of light-absorptive coatings within visible wavelengths range

Reflectivities of light-absorptive coatings within visible w...

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conference on current developments in lens design and optical Systems engineering

作者： Moldosanov, KA Henneck, R Skrynnikov, AM Kashirin, VA Makarov, VP Kobtsov, GA Samsonov, MA Kim, LS Special Design Off OKB Aalam Bishkek 720021 Kyrgyzstan

ISBN: (纸本)0819437387

This paper concerns the light-absorptive coatings intended for reduction of stray sunlight in the satellite-borne optical instrumentation and particle-analyzing apparatus operating in open space under intensive solar illumination. Though the inner surfaces are the passive elements in optical instruments, nontheless the condition and reflectivity of their surfaces can have noticeable effect on the signal-to-noise ratio of their detectors. In order to reduce an influence of the stray light on sensitivity of devices, the reflectivities of inner surfaces are strived to keep minimum in those wavelengths ranges, where the detectors spectral responses are high. We measured reflectivities of several types of traditional Tight-absorptive coatings and also tested our own approach to development of low reflectivity materials. The reflectivities were measured in visible and near-infrared wavelengths ranges (400 to 927 nm), as well as at the hydrogen Lyman-alpha line (121.6 mn), the most intensive line of the solar UV radiation. Also, the values of the solar absorptance alpha (s) and the emissivity epsilon were measured. They made it possible to classify the investigated coatings with their respects to a possible use in converters of solar radiation into the heat. Conclusions are given on application of diverse coatings depending on the instrument's detector type, operational wavelengths range, and operating conditions.

关键词： stray light sunlight light-absorptive coating low reflectivity material optical instrumentation

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Baffling system for the Wide Angle Camera (WAC) of ROSETTA mission

Baffling system for the Wide Angle Camera (WAC) of ROSETTA m...

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conference on current developments in lens design and optical Systems engineering

作者： Brunello, P Peron, F Barbieri, C Fornasier, S IUAV Univ Dept Bldg Construct Venice Italy

ISBN: (纸本)0819437387

After the experience of GIOTTO fly-by to comet Halley in 1986, the European Space Agency planned to improve the scientific knowledge of these astronomical objects by means of an even more ambitious rendezvous mission with another comet (P/Wirtanen). This mission, named ROSETTA, will go on from 2003 to 2013, ending after the comet perihelion phase and including also the ny-by with two asteroids of the main belt (140 Siwa and 4979 Otawara). Scientific priority of the mission is the in situ investigation of the cometary nucleus, with the aim of better understanding the formation and the composition of planetesimals and their evolution over the last 4.5 billions of years. In this context, the Authors were involved in the design of the baffling for the Wide Angle Camera (WAC) of the imaging system (OSIRIS) carried on board of the spacecraft. Scientific requirements for the WAC are: a large field of view (FOV) of 12 degrees x 12 degrees with a resolution of 100 mu rad per pixel, UV response, and a contrast ratio of 10(-4) in order to detect gaseous and dusty features close to the nucleus of the comet. To achieve these performances, a fairly novel class of optical solutions employing off-axis sections of concentric mirrors was explored. Regarding baffling, the peculiar demand was the rejection of stray-light generated by the optics for sources within the FOV, since the optical entrance aperture is located at the level of the secondary mirror (instead of the primary as usual). This paper describes the baffle design and analyzes its performances, calculated by numerical simulation with ray tracing methods, at different angles of incidence of the Light, for sources both outside and inside the field of view.

关键词： baffling system optical design stray-light analysis

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MicroScan: a DMD based optical surface profiler

MicroScan: a DMD based optical surface profiler

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conference on current developments in lens design and optical Systems engineering

作者： Bitte, F Dussler, G Pfeifer, T Frankowski, G IPT Fraunhofer Inst Prod Technol D-52074 Aachen Germany

ISBN: (纸本)0819437387

A Digital Micromirror Device (DMD) consists of an array of e.g. 1024 x 786 small micromirrors. Each of these mirrors has a size of 16 mum and can be individually switched to an angle of either +10 degrees or -10 degrees. Depending on how these micromirror pixels are switched various reflected patterns or images can be projected digitally when the DMD is properly illuminated. Whereas classical applications for DMDs include digital image- and video-projection, further applications in the field of optical metrology are possible as well. Since the DMD can also act as a pinhole, a new type of optical surface-profiler resembling a confocal microscope but using the DMD for flexible illumination and lateral scanning of the specimen has currently been set up at the Fraunhofer IPT. There are various process-parameters that influence the measurement, among these are e.g. pinhole-size, pinhole-shape, lateral step-size and the number of pinholes used simultaneously. With the presented instrument these process-parameters can not only be easily configured for individual measurements by simply programming the DMD, but also adaptive control of these parameters during the measurement may be achieved. The paper explains basics of DMD technology and confocal microscopy, illustrates the principle of the newly designed instrument, discusses difficulties and shows first results achieved with a set-up demonstrator.

关键词： optical metrology 3D surface inspection confocal microscope optical scanner digital micromirror device DMD MEMS

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Rotating prisms scanning system to equip a NFOV camera lens

Rotating prisms scanning system to equip a NFOV camera lens

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

作者： Curatu, E Chevrette, P StGermain, D Natl Opt Inst St Foy PQ G1P 4N8 Canada

ISBN: (纸本)0819432652

This paper presents the results given by the nominal design and tolerance analysis of a narrow-field-of-view camera lens equipped with a rotating prism scanning system. The first aspects taken into consideration have been the compensation of the chromatic aberration, distortion reduction, and the correlation between depth-of-field and lens resolution. Then, a rigorous approach to determine the relationship between the field-of-regard direction and the prism orientations is discussed. Finally, the tolerance analysis results give the predictable pointing direction precision as function of the system tolerances.

关键词： rotating prisms Risley prisms scanning system

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Calibrations and idiosyncrasies of micro-lensed CCD cameras

Calibrations and idiosyncrasies of micro-lensed CCD cameras

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

作者： Penkethman, JA Electroglas Inc Santa Clara CA USA

ISBN: (纸本)0819432652

Modern CCD cameras that are typically produced in high volume for consumer and machine vision applications can be used as precisely calibrated image sensors. New CCD chips with on-chip micro lens arrays, however, have some characteristics that limit design choices where precise illumination uniformity is required The micro lenses cause vignetting and limit the angular aperture of each pixel. This paper measures vignetting and consequent shading for a typical micro lensed CCD chip. Nevertheless, when properly designed, camera systems employing these advanced CCD chips can be precisely calibrated with respect to face plate irradiance.

关键词： CCD micro lens array calibration irradiance uniformity illumination uniformity on-chip lens array

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Calibration of 3D ring lens systems

Calibration of 3D ring lens systems

引用

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

作者： Ahmed, YA Afifi, H Rubino, G ENST Bretagne Networks & Multimedia Serv Dept F-35512 Cesson Sevigne France

ISBN: (纸本)0819432652

We have designed a new kind of 3D image capture system based on a new 3D ring lens(1). In this paper we represent a calibration procedure for this kind of systems using the information from the surrounding environment. It is mainly based on motion in one direction with known value and establishing the correspondence between the successive views to derive system parameters. The main differences between calibration of the traditional stereo systems and the new one are also discussed.

关键词： stereo epipolar geometry camera calibration self-calibration projection matrix fundamental matrix 3D lens and camera models

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Precise algebraic method to solve the noncemented two-lens objective free from the aperture aberrations

Precise algebraic method to solve the noncemented two-lens o...

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

作者： Kryszczynski, T Inst Appl Opt Det Geometr Opt PL-03805 Warsaw Poland

ISBN: (纸本)0819432652

An original method to enable the exact solution for the noncemented two-lens objective by means of any number of simultaneous non-linear equations is described. The method is limited to spherical surfaces without decentrations. Separations and refractive indices of glasses are fixed. Ail curvatures of surfaces are indirectly determined in the final stage. The typical meridional aperture aberrations deal with aplanatic and achromatic conditions. Essence of the method relies on formulation functions which contain trigonometric expressions and are nested up to certain depth. The method uses the advanced professional mathematical software which is indispensable for serving the non-linear system of equations. Numerical examples confirm the helpfulness of the method.

关键词： algebraic methods of the optical design use of computer algebra to the optical design

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optical system design for excimer laser materials processing

Optical system design for excimer laser materials processing

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

作者： Unnebrink, L Henning, T Kreutz, EW Poprawe, R Rhein Westfal TH Aachen Lehrstuhl Lasertech D-52074 Aachen Germany

ISBN: (纸本)0819432652

Non-imaging integrators which can be used for laser beam homogenization in materials processing with excimer laser radiation are analysed with regards to geometrical and statistical optics. A model for the transversal degree of coherence of the laser radiation is presented in order to estimate the performance of the integrating devices for the partially coherent excimer laser radiation. This is necessary for a more relevant design of those elements than a design by geometric optical means only. The concept of non-imaging integrators is enhanced by separating the multifaceted element from the focusing lens. This separation provides more flexibility in the processing distance of the optical system. A further enhancement is the combination of such a system with an imaging lens in order to create a system which produces a top hat fluence distribution with variable size for materials processing applications.

关键词： excimer laser non-rotationally symmetric optical elements beam homogenization materials processing multifaceted beam integrators transversal degree of coherence

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Aberrations of perturbed and unobscured optical systems

Aberrations of perturbed and unobscured optical systems

引用

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

作者： Agurok, I Phys Opt Corp Torrance CA 90505 USA

ISBN: (纸本)0819432652

The double expansion of the wavefront deformation in Zernike polynomials over the pupil and the field-of-view coordinates is a powerful tool for lens design, testing, and alignment. It provides a compact description of the wavefront deformation of perturbed and unobscued optical systems over the field-of-view. The integral of the mean-square wavefront deformation over the field-of-view is simply the sum of the products of the norms of the polynomials and the squared global coefficients. Eight or ten global coefficients can provide a comprehensive centered system description. Only fourteen main additional global coefficients is sufficient for the description of perturbed and unobscured optical systems.

关键词： double expansion of wavefront deformation perturbed and unobscured systems

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Segmented illumination lenses for steplighting and wall-washing

Segmented illumination lenses for steplighting and wall-wash...

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

作者： Parkyn, WA Teledyne Lighting and Display Products Inc. (United States)

ISBN: (纸本)0819432652

Many illumination situations involve a flat surface and an oblique luminaire placement. Today's commercially available luminaires give very uneven illumination here. A novel injection-moldable segmented lens is presented that will uniformly illuminate a rectangular zone, such as a stair-step or a picture on a wall. Its design is a development of prior methods(1) of lens-surface generation that derived the array of surface normal vectors required to match a source with a particular illumination prescription. This matching is done via grids on the unit sphere: one for the source and one for the prescription. The cells of these two grids are sized so that they have the same flux of lumens, according to the source intensity and the prescribed illumination, respectively. The first development is the use of an equi-flux polar grid for the target rectangle, because most light sources have circular symmetry. The second development is the radial segmentation of the lens surface in order to approximate the non-irrotational array of surface normal vectors derived from the two grids. designs are presented for step-lighting by LEDs and fiber-optic billboard lighting.

关键词： Light emitting diodes lenses Light sources and illumination optical spheres lens design Fiber optics Optics manufacturing Reflectors Light sources Refractive index

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