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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151-160 订阅

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Fast robust non-sequential optical ray-tracing with implicit algebraic surfaces 16

Fast robust non-sequential optical ray-tracing with implicit...

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conference on current developments in lens design and optical engineering xvi

作者： Greynolds, Alan W. 10741 E Placita Metate Tucson AZ 85749 USA

ISBN: (纸本)9781628417449

The fastest, most robust, general technique for non-sequentially ray-tracing a large class of imaging and non-imaging optical systems is by geometric modeling with algebraic (i.e. polynomial) implicit surfaces. The basic theory of these surfaces with special attention to optimizing their precise intersection with a ray (even at grazing incidence) is outlined for an admittedly limited software implementation. On a couple of "tame" examples, a 64-bit Windows 7 version is significantly faster than the fastest commercial design software (all multi-threaded). Non-sequential ray-surface interactions approaching 30M/sec are achieved on a 12-core 2.67 GHz Mac Pro desktop computer. For a more exotic example of a 6th degree Wood's horn beam dump (light trap), a 32-bit Windows single thread version traces rays nearly 4 times faster than the commercial ASAP software's implicit algebraic surface and over 13 times faster than its equivalent NURBS surface. However, implicit surfaces are foreign to most CAD systems and thus unfortunately, don't easily fit into a modern workflow.

关键词： Ray tracing software surface modeling

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optical model of optical volume diffusion plate - BSDF measurement of polycarbonate plate doped with silicon dioxide micro particle 16

Optical model of optical volume diffusion plate - BSDF measu...

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conference on current developments in lens design and optical engineering xvi

作者： Lin, Che-Chu Yu, Yeh-Wei Chen, Yu-Heng Le, Ming Sun, Ching-Cherng Chen, Jong-Wu Cheng, Chih-Yuan Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan Plast Ind Dev Ctr Taichung 407 Taiwan

ISBN: (纸本)9781628417449

High-efficiency diffusers play important roles in modern optical industry. The applications include back-light of television, uniform lighting, glare suppression, lighting decoration, and so on. In this paper, we develop optical volume diffusion plate using polycarbonate (PC) plate doped with silicon dioxide (SiO2) micro particle. The scattering distribution of diffusers is an important factor in the lighting design. Commercial detectors often measure the bidirectional scattering distribution function (BSDF) by a scanning and time-consuming method. We have proposed screen imaging synthesis (SIS) system in 2012, and it can easily measure the bidirectional transmittance distribution function (BTDF). In this paper, the optimized formula is presented to correct the vignetting effect and scattering effect caused by the screen. A quasi-Lambertian screen is made to enhance precision. Finally, we combine the SIS system with the rotation controller, and a semi-automatic measuring machine is built. The SIS generation can measure BSDF of the samples precisely and easily. In order to reduce glare problems and design a luminaire with uniform light distribution, we usually use diffusers to modulate the luminaire

关键词： BSDF BTDF BRDF Image reconstruction techniques

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design considerations for an unconventional infrared prism with a 90 degree ray deviation 16

Design considerations for an unconventional infrared prism w...

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conference on current developments in lens design and optical engineering xvi

作者： Akarca, Beyza Artan, Goktug Gencehan TUBITAK SAGE Ankara Turkey

ISBN: (纸本)9781628417449

In this study, the optical performance of a 90 degree prism working in the mid-wave infrared region with the purpose of carrying a beam of light from one optical system to another in an unconventional way is discussed. First, a group of mirrors is considered as a design alternative to lower the overall cost of the system. However, using mirrors greatly increases the diameter of the beam due to the rays coming from wide field of view angles. Another drawback of mirrors is that having separate mirrors requires precise alignment for the system to work at full performance which is difficult for the given application. However, these alignment issues are not valid for a single piece prism. Therefore, a single piece prism is the preferred option and has been taken into account in this study. Material selection is important, especially in the mid-wave infrared region where the index of refraction differs greatly from material to material. Silicon and Germanium are the materials preferred because of their high index of refraction and transmission characteristics. Aside from optical properties, these materials are also considered in terms of manufacturability. Also, options for the coatings to be applied to reflecting surfaces of the prism are discussed with regard to the transmission loss within the system. In order to have total internal reflection within a prism, coatings must be chosen carefully to handle transmission loss at the reflecting surfaces. All of the system parameters are examined using sequential and non-sequential modes of ZEMAX OpticStudio software.

关键词： 90 degree prism infrared prism optical design infrared prism

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Modeling and design of a multichannel chromatic aberration compensated imaging system 16

Modeling and design of a multichannel chromatic aberration c...

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conference on current developments in lens design and optical engineering xvi

作者： Belay, Gebirie Y. Ottevaere, Heidi Vervaeke, Michael Van Erps, Jurgen Thienpont, Hugo Vrije Univ Brussel Fac Engn Dept Appl Phys & Photon TONA Brussels Photon TeamB PHOT B-1050 Brussels Belgium

ISBN: (纸本)9781628417449

Conventional multichannel imaging systems comprise of many optical channels having similar imaging properties, namely field-of-view (FOV) and angular resolution/magnification. We demonstrated that the different optical channels can be designed such that each optical channel captures a different FOV and angular resolution compared to its neighboring channels. We designed and experimentally demonstrated a three-channel multiresolution imaging system where the first optical channel has the narrowest FOV (7 degrees) and highest angular resolution (0.0096 degrees) and the third optical channel has the widest FOV (80 degrees) and lowest angular resolution (0.0780 degrees)(1). The second optical channel has intermediate properties. The performance of the demonstrated three-channel imaging system however was affected by chromatic aberrations as it was designed for a single wavelength of 587.6 nm. The first optical channel was largely influenced by longitudinal chromatic aberration while the third channel by lateral chromatic aberration. Therefore, we have replaced the aspherical refractive lenses by hybrid lenses, which contain diffractive structures on top of their refractive surfaces, in the three-channel multiresolution imaging system to reduce its chromatic aberrations. The performance of the three channels with hybrid lenses is compared with those of the corresponding channels without hybrid lenses. The longitudinal color aberration of the first optical channel has been reduced from 1.7 mm to 0.2 mm;whereas the lateral color aberration of the third optical channel has been reduced from 250 mu m to 14 mu m. In conclusion, the hybrid lenses have reduced the chromatic aberrations of the three channels and extended the operating spectral range of the imaging system in the visible wavelength range.

关键词： Multi-resolution imaging systems angular resolution multi-channel chromatic aberrations

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

引用

conference on current developments in lens design and optical engineering xvi

ISBN: (纸本)9781628417449

The proceedings contain 24 papers. The topics discussed include: integration design of endoscope with different viewing angles;ultra-compact hourglass lens for integrated cameras;testing and alignment of freeform based multi-mirror telescopes;tolerancing an optical freeform surface: an optical fabricator's perspective;manufacture and analysis of a refractive surface with variable asphericity to model the human cornea;modeling and design of a multichannel chromatic aberration compensated imaging system;temperature-dependent refractive index measurements of L-BBH2 glass for the Subaru CHARIS integral field spectrograph;cryogenic refractive indices of S-LAH55, S-LAH55V, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14 glasses;temperature-dependent refractive index measurements of CaF2, Suprasil 3001, and S-FTM16 for the Euclid near-infrared spectrometer and photometer;design considerations for an unconventional infrared prism with a 90 degree ray deviation;and high-performance LED luminaire for sports hall.

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Chromatic error correction of diffractive optical elements at minimum etch depths 15

Chromatic error correction of diffractive optical elements a...

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conference on current developments in lens design and optical engineering XV

作者： Barth, Jochen Guehne, Tobias Airbus Def & Space Landshuter Str 26 D-85716 Unterschleissheim Germany Airbus Def & Space D-81663 Munich Germany

ISBN: (纸本)9781628412192

The integration of diffractive optical elements (DOE) into an optical design opens up new possibilities for applications in sensing and illumination. If the resulting optics is used in a larger spectral range we must correct not only the chromatic error of the conventional, refractive, part of the design but also of the DOE. We present a simple but effective strategy to select substrates which allow the minimum etch depths for the DOEs. The selection depends on both the refractive index and the dispersion.

关键词： Diffractive optics Aberration compensation

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optical design of Low Glare Luminaire Applied for Tunnel Light 15

Optical Design of Low Glare Luminaire Applied for Tunnel Lig...

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conference on current developments in lens design and optical engineering XV

作者： Tsai, M. S. Lee, X. H. Lo, Y. C. Sun, C. C. Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9781628412192

In this study, a low glare and high-efficient tunnel lighting design which consists of a cluster light-emitting diode and a free-form lens is presented. Most of the energy emitted from the proposed luminaire is transmitted onto the surface of the road in front of drivers, and the probability that the energy is emitted directly into drivers' eyes is low. Compared with traditional fluorescent lamps, the proposed luminaire, of which the optical utilization factor, optical efficiency, and uniformity are, respectively, 44%, 92.5%, and 0.72, performs favorably in traffic safety, energy saving, and glare reduction.

关键词： Light-emitting diodes Illumination design Nonimaging optics optical design and fabrication

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Afocal viewport optics for underwater imaging 15

Afocal viewport optics for underwater imaging

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conference on current developments in lens design and optical engineering XV

作者： Slater, Dan 1352 Dorothea Rd La Habra Hts CA 90631 USA

ISBN: (纸本)9781628412192

A conventional camera can be adapted for underwater use by enclosing it in a sealed waterproof pressure housing with a viewport. The viewport, as an optical interface between water and air needs to consider both the camera and water optical characteristics while also providing a high pressure water seal. Limited hydrospace visibility drives a need for wide angle viewports. Practical optical interfaces between seawater and air vary from simple flat plate windows to complex water contact lenses. This paper first provides a brief overview of the physical and optical properties of the ocean environment along with suitable optical materials. This is followed by a discussion of the characteristics of various afocal underwater viewport types including flat windows, domes and the Ivanoff corrector lens, a derivative of a Galilean wide angle camera adapter. Several new and interesting optical designs derived from the Ivanoff corrector lens are presented including a pair of very compact afocal viewport lenses that are compatible with both in water and in air environments and an afocal underwater hyper-hemispherical fisheye lens.

关键词： Afocal lens design underwater photography water contact lens Ivanoff corrector lens dome port hyperhemispherical fisheye lens

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Effect of Injection Molding Processing Conditions on optical Properties of Polyetherimide 15

Effect of Injection Molding Processing Conditions on Optical...

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conference on current developments in lens design and optical engineering XV

作者： Zhao, Wei Wall, Christopher Maddikeri, Raghavendra May, Andy SABIC Innovat Plast LLC 1 Lexan Lane Mt Vernon IN 47620 USA SABIC Innovat Plast LLC Pittsfield MA 01201 USA

ISBN: (纸本)9781628412192

SABIC's ULTEM (TM) (polyetherimide) resin has been the choice of material for injection moldable micro lenses and lens arrays in optical communication components such as transceivers due to its unique combination of physical, thermal and optical properties including high refractive index, low absorption in near IR range, good dimensional stability and high heat performance. It's known that processing conditions affect properties of final parts. Often the processing conditions are optimized for best mechanical properties, while their effect on optical properties is sidelined. In this study, the effect of injection molding processing conditions on optical properties of polyetherimide resin is discussed.

关键词： Polyetherimide Injection Molding Processing Conditions optical Properties lens

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Using saddle points for challenging optical design tasks 15

Using saddle points for challenging optical design tasks

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conference on current developments in lens design and optical engineering XV

作者： Livshits, Irina Hou, Zhe van Grol, Pascal Shao, Yifeng van Turnhout, Maarten Urbach, Paul Bociort, Florian Natl Res Univ Informat Technol Mech & Opt 16 Birzhevaya Line St Petersburg 199034 Russia Delft Univ Technol Optic Res Grp NL-2628CJ Delft Netherlands TNO Sci & Ind NL-2628CK Delft Netherlands

ISBN: (纸本)9781628412192

The present research is part of an effort to develop tools that make the lens design process more systematic. In typical optical design tasks, the presence of many local minima in the optical merit function landscape makes design non-trivial. With the method of Saddle Point Construction (SPC) which was developed recently ([F. Bociort and M. van Turnhout, Opt. engineering 48, 063001 (2009)]) new local minima are obtained efficiently from known ones by adding and removing lenses in a systematic way. To illustrate how SPC and special properties of the lens design landscape can be used, we will present the step-by-step design of a wide-angle pinhole lens and the automatic design of a 9-lens system which, after further development with traditional techniques, is capable of good performance. We also give an example that shows how to visualize the saddle point that can be constructed at any surface of any design of an imaging system that is a local minimum.

关键词： saddle points wide-angle lens

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