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

共 444 条记录，以下是241-250 订阅

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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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design of compact fisheye lens with slope-constrained Q-type aspheres

Design of compact fisheye lens with slope-constrained Q-type...

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conference on current developments in lens design and optical engineering XIV

作者： Xu, Chen Cheng, Dewen Song, Weitao Wang, Yongtian Wang, Qingfeng Beijing Inst Technol Sch Optoelect Beijing 100081 Peoples R China

ISBN: (纸本)9780819496911

Two types of fisheye lenses for automobile navigation are designed with slope-constrained Q-type aspheres. Special requirements have been considered in the design process, and Q-type surfaces are introduced by converted from other kinds of aspheric description with only coefficients of low-order terms retained. A possible problem of imaging the first surface onto the sensor has also been analyzed. As a result, as for the six-element fisheye lens, MTF is greater than 0.3 at 45lp/mm, f-theta distortion is less than 0.03 when the focal length is calibrated, field of view is 230 degrees and full field relative illumination is greater than 0.4. For the four-element fisheye lens, MTF is greater than 0.4 at 45lp/mm, f-theta distortion is less than 0.16, field of view is 190 degrees and full field relative illumination is greater than 0.6. The design results show that the Q-type surfaces employed in fisheye lenses can make the system more compact, lightweighted and easier to manufacture.

关键词： fisheye lens Q-type asphere distortion evaluation tolerance analysis image quality analysis

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Aspherical optics design for minimal spherical aberration in vision correction of human eyes

Aspherical optics design for minimal spherical aberration in...

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conference on current developments in lens design and optical engineering IX

作者： Jiang, Min-shan Lin, J. T. Zhou, Chuan-qing Ren, Qiu-shi Shanghai Jiao Tong Univ Inst Laser Med & Biophoton Shanghai Peoples R China Natl Taiwan Univ Inst Electroopt Taipei Taiwan

ISBN: (纸本)9780819472809

Using raytracing method (ZEMAX program), the reduction of SA of the whole human eye may be reduced via the combined effects of asphericity (Q) and the ratio of the front and back surface of an IOL. The overall SA for best image quality may be defined by Q* when the image position off axis is reduced to that of the paraxial. Our calculations show the following general features: (1) For a give Q value, the influence on the SA is proportional to the surface power;(2) for minimal whole eye SA, negative Q is needed in IOL;(3) for a given IOL power, the Q* is smaller when the front surface has a smaller power. All above features derived from numerical raytracing method are consistent with analytic formulas.

关键词： Spherical aberration raytracing huamn eye aspherical lens Q value LASIK surgery

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Application of the light field for a simulation to evaluate the MTF of optical lens systems using rendering

Application of the light field for a simulation to evaluate ...

引用

conference on current developments in lens design and optical engineering XIV

作者： Horiuchi, Shuma Yamamoto, Manabu Tokyo Univ Sci Dept Appl Elect Katsushika Ku Tokyo 1258585 Japan

ISBN: (纸本)9780819496911

The modulation transfer function (MTF) in lens systems can be simulated using rendering. Here, the MTF is obtained by rendering test charts with bar target patterns after they are passed through an optical imaging system. The benefit of this method is that it can be applied to shift-variant systems, to which it is difficult to apply the point spread function (PSF), and that it enables the comparison of theoretical results to experimental results when test charts are imaged through an optical imaging system. However, the number of sampled rays must be increased to suppress the variance in the resulting radiance distribution, and the computation time increases proportionally with the number of analyzed spatial frequencies. This report proposes the recording of the light field of light rays, which is a function describing light rays at the entrance pupil. Focused images are compiled for each test chart based on the recorded light field. The time necessary for compilation is significantly shorter than for ray tracing in a lens;therefore, the radiance distribution can be rapidly obtained when the spatial frequency is changed. The methodology to record the light field and the data format are outlined in this report.

关键词： rendering light field modulation transfer function imaging optics

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