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

共 635 条记录，以下是241-250 订阅

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A novel laser Doppler linear encoder using multiple-reflection optical design for high-resolution linear actuator

A novel laser Doppler linear encoder using multiple-reflecti...

引用

conference on current developments in optical design and engineering VII

作者： Shu, DM Alp, EE Barraza, J Kuzay, TM Mooney, TM Argonne Natl Lab Expt Facil Div Adv Photon Source Argonne IL 60439 USA

ISBN: (纸本)0819428841

A novel laser Doppler linear encoder system (LDLE) has been developed at the Advanced Photon Source, Argonne National Laboratory A self-aligning 3-D multiple-reflection optical design was used for the laser Doppler displacement meter (LDDM) to extend the encoder system resolution. The encoder is compact [about 70 mm(H) x 100 mm(W) x 250 mm(L)] and it has sub-Angstrom resolution 100 mm/sec measuring speed, and 300 mm measuring range. Because the new device affords higher resolution, as compared with commercial laser interferometer systems, and yet cost less, it will have good potential for use in scientific and industrial applications.

关键词： linear encoder angular encoder laser encoder high resolution actuator

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designing with φ-polynomial Surfaces

Designing with φ-polynomial Surfaces

引用

conference on optical design and engineering iv

作者： Fuerschbach, Kyle H. Rolland, Jannick P. Thompson, Kevin P. Univ Rochester Inst Opt Rochester NY 14627 USA

ISBN: (纸本)9780819487933

Recent advances have made it viable to fabricate optical surfaces that are not rotationally symmetric using a new generation of diamond-turning machines. This new fabrication capability allows for surfaces whose departure from a sphere varies both radially and azimuthally in the aperture to be machined into an optical surface. This new degree of freedom allows for the design of unobscured optical systems that are truly non-symmetric by tilting the optical surfaces themselves. With this new design degree of freedom, the aperture and field of view can be pushed to yield an order of magnitude increase in aerial coverage over current production while maintaining a compact solution. In one particular case, to be presented, a diffraction limited (< lambda/10), long wave infrared (LWIR), F/1.9, 10 degrees full field of view sensor telescope is designed by introducing these non-symmetric surfaces into the optical surface prescription.

关键词： Mirror system design Diamond machining Nonspherical mirror surfaces Infrared imaging

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Testing and alignment of freeform based multi-mirror telescopes 16

Testing and alignment of freeform based multi-mirror telesco...

引用

conference on current developments in Lens design and optical engineering XVI

作者： Zhang, Xue-jun Hu, Hai-xiang Xue, Dong-lin Li, Ming Chinese Acad Sci Changchun Inst Opt & Fine Mech & Phys Changchun 130033 Jilin Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

ISBN: (纸本)9781628417449

Three Mirror Anastigmat (TMA) systems including both on-axis and off-axis configurations have been widely used in space applications. In some designs, to correct for high order aberrations and realize large FOV, freeform surfaces are used to provide more design freedoms. This trend brings challenges to optical manufacturing and testing community Since testing is critical to make high accurate aspheres and freeform surfaces, the paper addressed Computer Generated Hologram (CGH) design and implement to measure large freeform mirrors. In particular, CGH assisted alignment procedure for TMA telescopes were discussed in detail.

关键词： TMA freeform mirror CGH testing optical alignment

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optical design of a single freeform lens for both counter-beam and pro-beam in LED tunnel lighting 25

Optical design of a single freeform lens for both counter-be...

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conference on current developments in Lens design and optical engineering XXV

作者： Syu, Jhih-Ling Lee, Tsung-Xian Tsai, Cheng-Hung Ma, Shih-Hsin Feng Chia Univ Dept Photon Taichung Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol Daan 106 Taiwan

ISBN: (纸本)9781510679221;9781510679238

A luminaire designed for tunnel lighting is proposed, featuring the ability to adjust the ratio between counter-beam and pro-beam lighting based on different contexts. This allows the luminaire to achieve the optimal lighting mode for the conditions within the tunnel at that time. When both side LEDs are activated, it operates in symmetric lighting mode. When a single-side LED is activated, it switches to either counter-beam or pro-beam lighting mode. The advantage of this luminaire lies in the use of a single freeform secondary lens and LEDs, making installation simpler. It ensures driver safety and is more energy-efficient than traditional tunnel lights.

关键词： optical design Tunnel Lighting Freeform Secondary lens Microstructure

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design of lens hoods for the "Lira-B" space telescope 19

Design of lens hoods for the "Lira-B" space telescope

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19th conference on current developments in Lens design and optical engineering

作者： Muratov, Artem Olyunin, Vyacheslav Bacholdin, Alexey Voznesenskaya, Anna ITMO Univ 49 Kronverksky Av St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The space investigation project "Lira-B" is purposed to perform a high-precision multicolor photometric all-sky survey of objects from 3 to 16 m. This investigation concludes in multiple photometric measurements in ten spectral bands from 200 to 1000 nm. Such telescope systems should provide maximum light gathering and meet stray light requirements. The main goal of the given work is optical design of the telescope system with lens hoods protecting against the parasitic illumination. Analysis of impact of the lens hoods' surface structure and coatings on the image quality is performed and ways to reduce the stray light in the system. The modeling is carried out using Zemax OpticStudio software in the non-sequential mode.

关键词： Lira-B Zemax lens hood telescopic system

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Effects and prediction of stray light produced by diffractive lenses

Effects and prediction of stray light produced by diffractiv...

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

作者： Thibault, S Renaud, N Wang, M INO Opt Engn Grp St Foy PQ G1P 4N8 Canada

ISBN: (纸本)0819432652

Correlation between computational models and corresponding experimental data of stray light produced by unwanted diffraction orders of diffractive lenses is described. It is shown that the attractive scaler model under Fresnel approximation does not agree with experimental data. The validity of Fresnel approximation for multi-order focusing optics is derived to explain the limitation of the scaler approach. Geometrical models with both coherent and incoherent summation of each diffractive orders coupled with efficiency estimation is used with success. The model takes into account the local diffraction efficiency and also of the number of diffractive orders supported locally by the structure. This geometrical optics model can be used in standard optical design software. Therefore it may be recommended as an additional tool for stray light analysis at the design stage of hybrid refractive/diffractive optical systems. In a second part, the impact of unwanted diffraction orders when diffractive optics is used in visible imaging systems is discussed. Several experimental observations about the use of plastic refractive/diffractive lens in relation to different fabrication process used to build the lens are also discussed. From those observations, we recommend an approach to reduce the stray light produced by the diffractive lens. In conclusion, a serious stray light analysis is mandatory in the design of visible imaging systems using diffractive lenses.

关键词： stray light diffractive optical element imaging optical design

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Linear decomposition of the optical transfer function for annular pupils 18

Linear decomposition of the optical transfer function for an...

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conference on current developments in Lens design and optical engineering XVIII

作者： Schwiegerling, Jim Univ Arizona Coll Opt Sci 1630 E Univ Blvd Tucson AZ 85721 USA

ISBN: (纸本)9781510612082;9781510612075

A technique for decomposing the optical Transfer Function (OTF) into a novel set of basis functions has been developed. The decomposition provides insight into the performance of optical systems containing both wavefront error and apodization, as well as the interactions between the various components of the pupil function. Previously, this technique has been applied to systems with circular pupils with both uniform illumination and Gaussian apodization. Here, systems with annular pupils are explored. In cases of annular pupil with simple defocus, analytic expressions for the OTF decomposition coefficients can be calculated. The annular case is not only applicable to optical systems with central obscurations, but the technique can be extended to systems with multiple ring structures. The ring structures can have constant area as is often found in zone plates and diffractive lenses or the rings can have arbitrary areas. Analytic expressions for the OTF decomposition coefficients again can be determined for ring structures with constant and quadratic phase variations. The OTF decomposition provides a general tool to analyze and compare a diverse set of optical systems.

关键词： optical Transfer Function Modulation Transfer Function Annular Pupils Mathematics Decomposition

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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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optical performance analysis of plenoptic camera systems 15

Optical performance analysis of plenoptic camera systems

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conference on current developments in Lens design and optical engineering XV

作者： Langguth, Christin Oberdoerster, Alexander Brueckner, Andreas Wippermann, Frank Braeuer, Andreas Fraunhofer Inst Appl Opt & Precis Engn D-07745 Jena Germany

ISBN: (纸本)9781628412192

Adding an array of microlenses in front of the sensor transforms the capabilities of a conventional camera to capture both spatial and angular information within a single shot. This plenoptic camera is capable of obtaining depth information and providing it for a multitude of applications, e.g. artificial re-focusing of photographs. Without the need of active illumination it represents a compact and fast optical 3D acquisition technique with reduced effort in system alignment. Since the extent of the aperture limits the range of detected angles, the observed parallax is reduced compared to common stereo imaging systems, which results in a decreased depth resolution. Besides, the gain of angular information implies a degraded spatial resolution. This trade-off requires a careful choice of the optical system parameters. We present a comprehensive assessment of possible degrees of freedom in the design of plenoptic systems. Utilizing a custom-built simulation tool, the optical performance is quantified with respect to particular starting conditions. Furthermore, a plenoptic camera prototype is demonstrated in order to verify the predicted optical characteristics.

关键词： plenoptic camera depth of field depth resolution optical performance analysis customized microlens array

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Simultaneous Multiple Surfaces method applied to infrared lenses 23

Simultaneous Multiple Surfaces method applied to infrared le...

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conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Mayeur, T. Volatier, J. B. Druart, G. Tartas, E. Durand, A. Cau, F. Off Natl Etud & Rech Aerosp 6 Chemin Vauve Granges F-91120 Palaiseau France Lynred 364 Route Valence F-38113 Veurey Voroize France Safran Elect & Def 100 Ave Paris F-91300 Massy France

ISBN: (纸本)9781510654198;9781510654181

In optical design, the designer's experience is critical. Indeed, an experienced optical designer will often choose a better starting point for optimization than an inexperienced one. Most of the time, lens design software use a local optimization algorithm, which is why the starting point is so important to get an excellent optical system. We present here an alternative to the classical optical design method and a solution to reduce the impact of the designer's experience. Our alternative couples the Simultaneous Multiple Surfaces (SMS) method, introduced by Benitez and Minano with optimization in Zemax OpticStudio. The SMS method is a direct construction method of optical systems without optical aberrations for as many field points as the system contains surfaces. This method can deal with both aspheric and freeform optical systems depending on the dimension of the method implemented. Our implementation of the SMS method can design optical systems with three surfaces. We use the SMS method to define a freeform system with an F-number of 0.85. Then, we use this fast freeform system as a starting point to perform further optimization in Zemax OpticStudio. Finally, we achieve to design two diffraction-limited freeform systems, one over a square field of view of +/- 30 degrees and another over a rectangular field of view of +/- 33 degrees x +/- 26 degrees.

关键词： Simultaneous Multiple Surfaces freeform surfaces Cartesian oval automated method optical design

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