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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361-370 订阅

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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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Comparison of the Measured and Analytical Response Profiles of a 3.3 to 15.5 μ Imaging System and the Effect of Detector Diffusion

Comparison of the Measured and Analytical Response Profiles ...

引用

current developments in lens design and optical engineering IV

作者： Bruce Jr., C.F. Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109

This paper provides an overview of the Tropospheric Emission Spectrometer (TES) and its mission, as a part of NASA's Earth Observing System (EOS). The design of the re-imaging system and its detectors and the test set-up used to characterize the field of view response will be presented. Measured system optical response profiles will be presented for each of the four infrared spectral bands (3.5-5.3, 5.1-9.1, 8.3-12.2 and 11.1 - 15.4 μ) supported by TES. Specific emphasis will be placed upon the comparison of these measured optical response functions with the results of an analytic model of the response. The model includes a simple yet accurate representation of the detector response function, which includes the photo-generated electron's diffusion length.

关键词： optical systems

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Compact Multibeam Dual-Frequency (24 and 77 GHz) Imaging Antenna for Automotive Radars

Compact Multibeam Dual-Frequency (24 and 77 GHz) Imaging Ant...

引用

European conference on Microwave

作者： Bernhard Schoenlinner James P. Ebling Leo C. Kempel Gabriel M. Rebeiz Radiation Laboratory Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Electr. and Computer Engineering Michigan State University East Lansing MI USA

2 versions of a compact multi-beam dual-frequency antenna for 24 and 77 GHz have been developed for automotive applications. The antenna consists of a spherical Teflon lens with a frequency selective surface (FSS), which is fed by two sets of endfire tapered slot antennas (TSAs). The FSS is built on a 127 μm-thick Duroid™ substrate and is placed between two Teflon hemispheres, and is reflective at 24 GHz and transparent at 77 GHz in the first design, and is transparent at 24 GHz and reflective at 77 GHz in the second design. The TSAs for the 24 GHz and 77 GHz systems are built on a single piece of 254 μm-thick Duroid™ substrate. The measured patterns result in E and H-plane patterns with a -3-dB beamwidth of 19° at 24 GHz and 5.5° at 77 GHz. The sidelobe level is better than -17 to -20 dB when the FSS is transparent and is better than -14 dB when the FSS is reflective. The calculated efficiency of this antenna system is around 50%. The current designs provide 33° coverage at 24 GHz (3 beams) and 55° coverage at 77 GHz (11 beams) in the first design, and 99° coverage at 24 GHz (7 beams) and 33° coverage at 77 GHz (7 beams) in the second design, but the angles can be changed to suit different coverage angles.

关键词： Automotive engineering Radar antennas Radar imaging lenses Frequency selective surfaces optical design Antenna feeds Slot antennas Metallization optical imaging

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Compact multibeam dual-frequency (24 and 77 GHz) imaging antenna for automotive radars

Compact multibeam dual-frequency (24 and 77 GHz) imaging ant...

引用

European conference on Microwave

作者： B. Schoenlinner J.P. Ebling L.C. Kempel G.M. Rebeiz Radiation Laboratory Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Electr. and Computer Engineering Michigan State University East Lansing MI USA

2 versions of a compact multi-beam dual-frequency antenna for 24 and 77 GHz have been developed for automotive applications. The antenna consists of a spherical Teflon lens with a frequency selective surface (FSS), which is fed by two sets of endfire tapered slot antennas (TSAs). The FSS is built on a 127 /spl mu/m-thick Duroid substrate and is placed between two Teflon hemispheres, and is reflective at 24 GHz and transparent at 77 GHz in the first design, and is transparent at 24 GHz and reflective at 77 GHz in the second design. The TSAs for the 24 GHz and 77 GHz systems are built on a single piece of 254 /spl mu/m-thick Duroid substrate. The measured patterns result in E and H-plane patterns with a -3-dB beamwidth of 19/spl deg/ at 24 GHz and 5.5/spl deg/ at 77 GHz. The sidelobe level is better than -17 to -20 dB when the FSS is transparent and is better than -14 dB when the FSS reflective. The calculated efficiency of this antenna system is around 50%. The current designs provide 33/spl deg/ coverage at 24 GHz (3 beams) and 55/spl deg/ coverage at 77 GHz (11 beams) in the first design, and 99/spl deg/ coverage at 24 GHz (7 beams) and 33/spl deg/ coverage at 77 GHz (7 beams) in the second design, but the angles can be changed to suit different coverage angles.

关键词： Automotive engineering Radar antennas Radar imaging lenses Frequency selective surfaces Radar applications optical design Antenna feeds Laboratories Computer science

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New aberration properties of two-mirror Cassegrain lenses

New aberration properties of two-mirror Cassegrain lenses

引用

conference on current developments in lens design and optical engineering III

作者： Bezdidko, SN Sci Ctr House Opt Moscow Russia

Analysis of aberration performance of two-mirror Cassegrain lens allowed revealing an interesting relationship between them and the central obscuration coefficient epsilon and the distance delta of the focal plane fro... 详细信息

ISBN: (纸本)0819445347

关键词： lens design aberration performance two-mirror Cassegrain lens

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New infrared optical systems using diffractive optics

New infrared optical systems using diffractive optics

引用

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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designing Aspherics with discrete representation

Designing Aspherics with discrete representation

引用

conference on current developments in lens design and optical engineering III

作者： Wei, N Gong, MI Yan, P Zhang, HT Tsing Hua Univ Dept Precis Instrument Digital Photon Lab Beijing 100084 Peoples R China

ISBN: (纸本)0819445347

We have developed a new method other than traditional technique based on ray tracing and optimization algorithm to design arbitrary aspherics. Analytic definition of the aspheric surfaces is done away with and numerical solution of nonlinear difference equations called Aspheric Intrinsic Equations (AIE) is implemented instead. Simulation results compared with traditional optical design software are presented, which prove that this new method is more effective and reliable in designing aspheric surfaces.

关键词： aspherics discrete representation optical disk lens design

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Dynamic study of a Varioptic variable focal lens

Dynamic study of a Varioptic variable focal lens

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conference on current developments in lens design and optical engineering III

作者： Gabay, C Berge, B Dovillaire, G Bucourt, S Ecole Normale Super Lyon F-69007 Lyon France

ISBN: (纸本)0819445347

We present real-time measurements of the wave front distortion induced by a variable focal lens. This lens, called Varioptic, is made of a transparent cell filled with twin liquids. We submit a 4.5mm in diameter lens upon a 110V voltage step inducing a optical power shift of about 25 dioptries (m(-1)). Characteristic response time is shown to be of the order of a few 1/100s, the lens recovering its full quality after 5/100s. We present a scaling analysis of this response time versus lens size.

关键词： Wavefronts Liquids Interfaces Wavefront distortions Spherical lenses CCD image sensors optical fibers Prototyping Solids Liquid crystals

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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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optical design of a reflectance/Raman confocal microspectrometer

Optical design of a reflectance/Raman confocal microspectrom...

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conference on current developments in lens design and optical engineering III

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

ISBN: (纸本)0819445347

A miniaturized instrument for systematic planetary mineralogy is presented, and the optical design of the component parts is discussed. The instrument combines the following capabilities: wide field color imaging, confocal imaging at two different resolution/range levels, reflectance spectroscopy in the 400-2500 nm region with a resolution of 10 nm, and Raman spectroscopy over 4000 cm(-1) with an average resolution of 3.3 cm(-1). The instrument can also serve as an expandable platform for adding fluorescence spectroscopy, or for examining samples from a distance of several meters while using the same spectrometer.

关键词： optical design confocal microscopy planetary mineralogy reflectance spectroscopy Raman spectroscopy

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