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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361-370 订阅

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design of a dual field-of-view optical system for infra-red focal-plane arrays

Design of a dual field-of-view optical system for infra-red ...

引用

conference on current developments in lens design and optical engineering III

作者： Akram, MN Royal Inst Technol Dept Microelect & Informat Technol SE-16440 Stockholm Sweden

ISBN: (纸本)0819445347

In this paper, the design of a dual field-of-view optical system for 3-5 mum infra-red focal-plane arrays is described. Preliminary calculations are done to determine the first-order parameters of the narrow and the wide-field modes. To achieve a switchable dual field-of-view system, two different optical configurations, one based on the axial motion of a lens group and the other based on a rotate-in motion of two separated lens groups, are studied and compared. Diffractive and conic surfaces are used to control the color and the monochromatic aberrations with less number of total lenses used. Paraxial and real-ray modelling of the Narcissus effect is described. It is shown that the rotate-in scheme achieves better optical performance in both the narrow and the wide-field modes. The axial-motion scheme suffers from poor lateral color in the wide-angle mode. The final optical designs along with their aberrations curves and MTF plots are presented showing excellent performance.

关键词： lens design infrared optics diffractive optics dual field-of-view focal-plane-arrays (FPA)

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New infrared optical systems using diffractive optics

New infrared optical systems using diffractive optics

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conference on current developments in lens design and optical engineering III

作者： Bigwood, C Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819445347

A method for computing the polychromatic MTF of hybrid refractive - diffractive elements is described taking into consideration the effects of not only the primary diffraction order but also the effects of additional parasitic diffraction orders. The results of this approach are compared with the more conventional single order calculation and with actual measured performance. For certain markets and applications the cost of infrared lenses are critical in order to achieve customer expectations. Two possible methods of realising this requirement are the use of moulded optics or the use of multiple kinoform optics with no refractive power. Examples of such lenses are given along with discussion of the merits and limitations that each approach entails.

关键词： optical design infrared diffractive optics

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design considerations for a compact infrared airborne imager to meet alignment and assembly requirements

Design considerations for a compact infrared airborne imager...

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conference on current developments in lens design and optical engineering III

作者： Spencer, HM DRS Sensor Syst Torrance CA USA

ISBN: (纸本)0819445347

Helicopter mounted optical systems require compact packaging, good image performance (approaching the diffraction-limit), and must survive and operate in a rugged shock and thermal environment. The always-present requirement for low weight in an airborne sensor is paramount when considering the optical configuration. In addition, the usual list of optical requirements which must be satisfied within narrow tolerances, including field-of-view, vignetting, boresight, stray light rejection, and transmittance drive the optical design. It must be determined early in the engineering process which internal optical alignment adjustment provisions must be included, which may be included, and which will have to be omitted, since adding alignment features often conflicts with the requirement for optical component stability during operation and of course adds weight. When the system is to be modular and mates with another optical system, a telescope designed by different contractor in this case, additional alignment requirements between the two systems must be specified and agreed upon. Final delivered cost is certainly critical and "touch labor" assembly time must be determined and controlled. A clear plan for the alignment and assembly steps must be devised before the optical design can even begin to ensure that an arrangement of optical components amenable to adjustment is reached. The optical specification document should be written contemporaneously with the alignment plan to insure compatibility. The optics decisions that led to the success of this project are described and the final optical design is presented. A description of some unique pupil alignment adjustments, never performed by us in the infrared, is described.

关键词： Imaging systems Telescopes Sensors optical alignment Scanners Infrared radiation Objectives optical design Tolerancing Infrared imaging

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Novel CNC polishing process for control of form and texture on aspheric surfaces

Novel CNC polishing process for control of form and texture ...

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conference on current developments in lens design and optical engineering III

作者： Walker, DD Beaucamp, ATH Brooks, D Freeman, R King, A McCavana, G Morten, R Riley, D Simms, J UCL Dept Phys & Astron Opt Sci Lab London WC1E 6BT England

ISBN: (纸本)0819445347

We first consider the potential impact of a technology that could deliver polished, accurate aspheric surfaces in a routine and automated manner. We then summarise the technical challenge, and present an appraisal of the performance of the novel 'Precessions' process, which is a major advance in this direction. We outline the design concepts behind the productionized CNC polishing machines which executes the process, and then describe the progress developing strategies to preserve form when polishing ground surfaces, and to correct form on both pre-ground and polished surfaces. Particular consideration is given to resolving the inherent difficulties of control of centres on rotationally-symmetric parts. We then report on experimental results achieved with the machines. Finally, we present our programme to extend the control-algorithms to handle fully free-form surfaces, and draw conclusions about the effectiveness and generality of the 'Precessions' technique.

关键词： Polishing Surface finishing Aspheric lenses Process control Raster graphics Spherical lenses Mirrors Astronomy optical instrument design Polishing equipment

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Reflectivity of the Al-Cr stray-light-absorptive coating

Reflectivity of the Al-Cr stray-light-absorptive coating

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conference on current developments in lens design and optical engineering III

作者： Anisimov, VP Anisimova, IA Moldosanov, KA Skrynnikov, AM Kashirin, VA Kyrgyz Acad Sci Inst Chem & Chem Technol Bishkek 720071 Kyrgyzstan

ISBN: (纸本)0819445347

Results of measurements of the total hemispherical reflectance (THR), emissivity c and solar radiation absorption factor alpha(s) of the Al-Cr stray-light-absorptive coating are reported. This coating was designed to reduce the stray sunlight background in aerospace instruments. Generally, this problem arises when a density of instruments installed on the satellite is high and it is difficult to avoid getting to instrument the light reflected by neighboring devices. The THR, epsilon and alpha(s) measurement results are presented for 10 wavelengths within a range from. 400 to 927 nm, and also at 121.6 nm, the most intensive line of the solar UV spectrum, which is able to create considerable contribution to the detector noise in space devices. The goal of present experiments was to test an idea that by providing the electron scattering in the coating skin layer, it is possible to reduce the THR. To have the samples with increased electron scattering intensity, the samples of the Al-Cr coating were manufactured. As in the Al-Cr alloy the d-band of chromium electrons is located in the vicinity of the Fermi energy of Al, in this alloy a considerable electron scattering takes place. Therefore, within the skin layer of such coating, the electrons excited by photons transfer their energies and momenta to the lattice and other electrons instead of releasing the secondary photons. Hence, the reflectivity of the Al-Cr coating might be reduced. The prepared samples and performed experiments confirmed this assumption. According to the measurement results, the chromium appears to be an acceptable additional admixture to provide a further reflectivity reduction in the previously studied promising Al-N coating.

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

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Sphere-shaped durable and isometric diamond powders for super-quality treatment of optical materials

Sphere-shaped durable and isometric diamond powders for supe...

引用

conference on current developments in lens design and optical engineering III

作者： Samoylova, L Krinskaya, E R&P Co LTD Alkion Kiev Ukraine

ISBN: (纸本)0819445347

For the first time, developed are sphere-shaped precision diamond micropowders ASMV-RM having a number of unique properties - advanced, ordered crystal structure, improved surface morphology, maximal hardening of crystals with increase wear-resistant, with high uniformity of grains and in physico-mechanical properties, with absence of needle, sharp-angled crystals. These exclusive properties enable to provide the considerable increase of productivity of processes at essential improvement of surface quality during thin grinding and polishing of products by these micropowders. They are outside of a competition to the standard marks of diamonds of general purpose as were created for new highly perspective areas of applications focused on high technologies in electronics, optics and other branches of modem engineering. In precision micropowders ASMV-RM enormous potential of diamonds is realized. The technology of precision diamond micropowders preparation is based on results of the scientific school by Academician of the National Academy of Sciences of Ukraine V.I. Trefilov and complex approach directed on deepened influence on a material with application of modem effective technologies and the optimum technical solutions. The technology of their manufacture is referred to high technologies, and precision micropowders have created a new direction in diamond branch. Real conditions for realization of technical revolution in creation and use of a new class precision diamond micropowders are now created.

关键词： dislocation precision sphere-shaped micropowder physico-mechanical properties static diamonds dynamic diamonds

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Integrated optical design

Integrated optical design

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conference on current developments in lens design and optical engineering II

作者： Forney, P Lockheed Martin Space Syst Co Missiles & Space Operat Ctr Adv Technol Sunnyvale CA 94089 USA

ISBN: (纸本)0819441554

In order to produce an instrument or sensor design in the face of demanding environmental constraints of a spaceborne system, an integrated approach to sensor design has been developed that incorporates design tools for: optical design, mechanical design, structural, stray light and thermal analysis. This integrated approach can be extended to the entire payload design and its increased constraints.

关键词： optical design Computer aided design MATLAB Mirrors Sensors Mechanical engineering Systems modeling Thermal modeling Integrated modeling Integrated optics

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Infrared hybrid optics: analysis and implementation

Infrared hybrid optics: analysis and implementation

引用

conference on current developments in lens design and optical engineering II

作者： Wood, AP THALES Opt Ltd St Asaph LL17 0LL Denbighshire Wales

ISBN: (纸本)0819441554

Hybrid optics offer a valuable aberration correction tool for the lens designer. However, careful consideration must be given to the calculation of the optical performance during the design process, and to the practical implementation of the elements if the potential benefits are to be realised in practice. optical performance can be accurately assessed by tracing multiple diffraction orders. It may be particularly important to utilise such a technique if, for example, the image-forming bundles sample a small number of diffractive zones. This situation is examined in detail.

关键词： optical design infrared diffractive optics

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Linear wavelength spectrometer

Linear wavelength spectrometer

引用

conference on current developments in lens design and optical engineering II

作者： Thibault, S INO Opt Engn Div St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819441554

Generally, a spectrometer uses a diffraction grating to spread the spectral components of a light incident on the diffraction grating on a one-dimensional detector. The detector is composed of pixels linearly distributed along a line. However, the diffracted light is not spread linearly on the detector which means that the Wavelength on pixel I is not linearly correlated with the wavelength on pixel 2. The resolution is therefore not constant for all the spectral range of the spectrometer. To know which pixel corresponds to which wavelength, a nonlinear calibration process must be applied to get a linear relation between the diffracted light position and the wavelength of this light. The new spectrometer that we present uses a special lens configuration name F-sin(theta) lens to provide a linear relation in the image plane between the pixel position and the wavelength of the light. The f-sin(theta) characteristic is defined as the difference in percent between the design position of the wavelength in the image plane and its ideal position, if the lens is perfect. The characteristic of the lens used in the spectrometer is better than 0.1%. The concept can also be used for WDM and DWDM applications.

关键词： spectrometer WDM DWDM distortion optical design guided optics

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F-sin(theta) lens system and applications

F-sin(theta) lens system and applications

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conference on current developments in lens design and optical engineering II

作者： Thibault, S INO Opt Engn Div St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819441554

Introducing the desired amount of distortion in an optical system is possible and relatively straight forward for optical designer. Known f-theta lenses used in laser scanner system is one of the most popular lenses of this type. With the development of DWDM system, compact spectrometer and various grating based devices, the interest in solving optical problems with innovative optical design has been a revival. On the other hand, it is possible to simplify considerably the task of the software by designing more sophisticated optical element. The F-sin(theta) lens is such a device which can be used in various grating based devices to improve the performance. This optical device is intended to provide a new lens or lens group which can be used with a diffraction grating to provide a linear output plane with the wavelength (lambda), but also with the order of diffraction (m), or with the grating spatial frequency, or with the inverse of the index of refraction (l/n). Based on theoretical consideration, we calculated which amount of distortion is desired to get linear output plane for a grating based device. We present singlet. achromatic doublet and mirror having this characteristic. These F-sin(theta) lenses present satisfactory distortion charateristic and have an improved correction for the curvature of image plane. F-sin(theta) lens will be also name F-lambda lens.

关键词： WDM DWDM distortion optical design aberration grating spectrometer

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