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

共 444 条记录，以下是241-250 订阅

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design of a discrete scan laser focusing system with a ring grating scan element

Design of a discrete scan laser focusing system with a ring ...

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conference on current developments in lens design and optical engineering IX

作者： Rodgers, J. Michael Opt Res Associates Pasadena CA 91107 USA

ISBN: (纸本)9780819472809

An optical system application required a high speed laser scanning subsystem that produced high quality extended images focused at 32 discrete separated positions along a line, rather than continuously varying positions along the line as in more familiar scanning systems. This paper describes the optical design trades and selection of a grating-based scan element that produces this unusual type of scan, and the optical design methods that corrected aberrations produced by the scan element. A variety of different grating-based scan element designs were explored, in a flat disk geometry, but these produced excessive aberrations, both in the absolute level and in the magnitude of variation with scan. A ring-shaped scan element geometry was identified, which greatly minimized the scan-varying aberrations and brought them to near acceptable levels. Additional cylindrical corrector elements were added near the ring scan element to reduce the astigmatism of the ring substrate, and cylindrical lenslets were placed near the focus to provide further independent correction of astigmatism in each scan position. The resulting design achieved diffraction limited wavefront quality across the scan range.

关键词： optical design gratings scanning systems

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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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The design of Beam Shaping Focused lens Applied in Solar Energy Concentration

The Design of Beam Shaping Focused Lens Applied in Solar Ene...

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conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Ma, Shih-Hsin Lee, Chi-Hung Lee, Yun-Parn Wu, Jih-Huah Tseng, Chun-Ming Feng Chia Univ Dept Photon Taichung 40724 Taiwan Feng Chia Univ Dept Elect Engn Taichung Taiwan Ming Chuan Univ Dept Elect Engn Taoyuan Taiwan Ming Chuan Univ Dept Biomed Engn Taoyuan Taiwan

ISBN: (纸本)9780819487384

In this paper, we proposed a new configuration of concentrator in solar PV system. A special optical system in the concentrator used in focusing sun light to solar cell is proposed, the system compose of an aspherical surface and a specific diffusing surface. The uniform-squared light pattern is obtained on the solar cell, the shape and size of light pattern can be modulated by the parameters of the diffusing surface. In order to decrease the weight of the lens, the concentrator in Fresnel lens type is built at last. Besides, the optical efficiencies formed by the aspherical concentrator and Fresnel concentrator are about 92% and 77%, the concentrations are about 720mW/mm(2) and 640mW/mm(2), and the acceptance angles are about 0.35 degrees and 0.30 degrees, respectively. The tolerances in assembling the component of the concentrator are also discussed in detail.

关键词： Photovoltaic solar cell solar energy concentrator

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Cryogenic lens design Case Study: Gemini Planet Imager Spectrograph

Cryogenic Lens Design Case Study: Gemini Planet Imager Spect...

引用

conference on current developments in lens design and optical engineering XII/Advances in Thin Film Coatings VII

作者： Thibault, S. Univ Laval Dept Phys Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9780819487384

Making a lens design working at cryogenic temperature is a real challenge. Both optical and mechanical designer must work together to prevent problems during operation. The Gemini Planet Imager (GPI), currently under construction will be a facility instrument for the 8-m Gemini South telescope. The science instrument is a cryogenic integral field spectrograph based on a lenslet array. The integral field nature of the instrument allows for a full mapping of the focal plane at coarse spectral resolution. With such a data cube, artifacts within the PSF such as residual speckles can be suppressed. Additionally, the initial detection of any candidate planet will include spectral information that can be used to distinguish it from a background object: candidates can be followed up with detailed spectroscopic observations. The optics between the lenslet array and the detector are essentially a standard spectrograph with a collimating set of lenses, a dispersive prism and a camera set of lenses in a folded assembly. This paper describes the process from the first preliminary design to the final cryogenic system for both optical and mechanical design to achieve cryogenic working solution. We also discussed the assembly procedure (room temperature vs cryogenic compensation), the test support equipments and finally the laboratory optical performances over the field of view.

关键词： Planet imager cryogenic spectrograph test image quality

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The orbiting carbon observatory (OCO) instrument optical design

The orbiting carbon observatory (OCO) instrument optical des...

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conference on current developments in lens design and optical engineering V

作者： Haring, R Pollock, R Sutin, B Crisp, D Hamilton Sundstrand Pomona CA 91701 USA

ISBN: (纸本)0819454613

The Orbiting Carbon Observatory (OCO) will measure the distribution of total column carbon dioxide in the Earth's atmosphere from an Earth-orbiting satellite. Three high-resolution grating spectrometers measure two CO2 bands centered at 1.61 and 2.06 mum and the oxygen A-band centered at 0.76 mum in the near infrared region of the spectrum. This paper presents the optical design and highlights the critical optical requirements flowed down from the scientific requirements. These requirements necessitate a focal ratio of f/1.9, a spectral resolution of 20,000, and precedence-setting requirements for polarization stability and the instrument line shape function. The solution encompasses three grating spectrometers that are patterned after a simple refractive spectrometer approach consisting of an entrance slit, a two-element collimator, a planar reflection grating, and a two-element camera lens. Each spectrometer shares a common field of view through a single all-reflective telescope. The light is then re-collimated and passed through a relay system, separating the three bands before re-imaging the scene onto each of the spectrometer entrance slits using an all-reflective inverse Newtonian re-imager.

关键词： infrared spectrometer greenhouse gases carbon dioxide oxygen A-band

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Eliminating Dewar Narcissus artifacts induced by moving optics in infrared staring focal plane sensors

Eliminating Dewar Narcissus artifacts induced by moving opti...

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conference on current developments in lens design and optical engineering XIII

作者： McCulloch, Philip M. Olson, Craig Goodman, Timothy D. L3 Commun Sonoma EO Santa Rosa CA 95403 USA

ISBN: (纸本)9780819492036

Staring infrared imagers have multiple surfaces within the integrated Dewar assembly which contribute to non-traditional Narcissus artifacts. Static non-uniformity correction is insufficient to remove dynamic Narcissus artifacts caused by moving focus or zoom groups. Dynamic Narcissus artifacts often manifest as rings apparent to the human eye, although they may lie near the noise floor of the imager. Moreover, strong field curvature of the Narcissus can complicate diagnosis using paraxial methods. We compare a simple pupil ghost metric to traditional Narcissus metrics and present an experimental case study illustrating how the metric can be used during optimization to eliminate the effect.

关键词： optical design Narcissus staring array infrared optics YNI i/ibar

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Unique aspects of designing & tolerancing an optical testing system

Unique aspects of designing & tolerancing an optical testing...

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conference on current developments in lens design and optical engineering V

作者： Hadaway, JB Reardon, PJ Univ Alabama Ctr Appl Opt Huntsville AL 35899 USA

ISBN: (纸本)0819454613

The design & tolerancing of an optical testing system (OTS) presents a unique set of challenges not generally encountered during the typical optical design process. The authors have spent the past six years developing and using a series of optical systems designed to measure the surface figure & radius-of-curvature of various ultra-lightweight mirrors at 30 K. These mirrors were part of a technology development program to support NASA's James Webb Space Telescope (JWST). The design of these systems required consideration of the following: (i) potentially large figure errors in the test mirror (due to gravity sag & cryo-distortion), (ii) cryo-shrinkage of the aperture and radius-of-curvature, (iii) figure changes due to the use of mirror actuators, and (iv) vibration between the OTS & the test mirror. In addition, an exhaustive tolerancing process was required for each system in order to reach a set of alignment tolerances that were achievable using the equipment available and within the test environment. The authors found many aspects of the OTS design process to be significantly different from the norm;at the same time, however, viewing the process as a typical optical design problem often-times brought clarification. This paper will describe both the differences and the similarities observed between the design of an OTS as opposed to a traditional imaging system.

关键词： optical design tolerancing optical testing cryogenic

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Focal splitting and optical vortex structure induced by stress birefringence

Focal splitting and optical vortex structure induced by stre...

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conference on current developments in lens design and optical engineering VIII

作者： Spilman, Alexis K. Beckley, Amber M. Brown, Thomas G. Univ Rochester Inst Opt Rochester NY 14627 USA

ISBN: (纸本)9780819468154

A variety of interesting polarization effects can be observed using a parallel-face window placed under symmetric stress of order m = 3 and illuminated with polarized light. Such windows, when placed under sufficient stress, can produce rings of alternating vortex and non-vortex fields. When light is brought to a focus, one component of circular polarization forms two nearly diffraction limited focal spots with axial separation larger than the usual depth of focus. We analyze and experimentally test these phenomena using interferometric methods as well as a Strehl ratio model and conclude by discussing applications to optical imaging.

关键词： polarization birefringence vortex beams

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Landsat-swath Imaging Spectrometer design 16

Landsat-swath Imaging Spectrometer Design

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conference on current developments in lens design and optical engineering XVI

作者： Mouroulis, Pantazis Green, Robert O. Van Gorp, Byron Moore, Lori Wilson, Daniel W. Bender, Holly A. CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)9781628417449

We describe the design of a high-throughput pushbroom imaging spectrometer and telescope system that is capable of Landsat swath and resolution while providing better than 10 nm per pixel spectral resolution. The design is based on a 3200 x 480 element x 18 mu m pixel size focal plane array, two of which are utilized to cover the full swath. At an optical speed of F/1.8, the system is the fastest proposed to date to our knowledge. The utilization of only two spectrometer modules fed from the same telescope reduces system complexity while providing a solution within achievable detector technology. Predictions of complete system response are shown. Also, it is shown that detailed ghost analysis is a requirement for this type of spectrometer and forms an essential part of a complete design.

关键词： Imaging spectrometer Landsat Dyson spectrometer

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optical designs for the Mars '03 rover cameras

Optical designs for the Mars '03 rover cameras

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conference on current developments in lens design and optical engineering II

作者： Smith, GH Hagerott, EC Scherr, LM Herkenhoff, KE Bell, JF GHS Opt Pasadena CA 91101 USA

ISBN: (纸本)0819441554

In 2003, NASA is planning to send two robotic rover vehicles to explore the surface of Mars. The spacecraft will land on airbags in different, carefully chosen locations. The search for evidence indicating conditions favorable for past or present life will be a high priority. Each rover will carry a total of ten cameras of five various types. There will be a stereo pair of color panoramic cameras, a stereo pair of wide-field navigation cameras, one close-up camera on a movable arm, two stereo pairs of fisheye cameras for hazard avoidance, and one Sun sensor camera. This paper discusses the lenses for these cameras. Included are the specifications, design approaches, expected optical performances. prescriptions, and tolerances.

关键词： optical engineering lens design cameras Mars JPL

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