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

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Research on Angle-selective Filters of Phosphor Color Wheel for LED Projectors

Research on Angle-selective Filters of Phosphor Color Wheel ...

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Wei, Tzu-Chiao Kuo, Chien-Cheng Huang, June-Jei Lee, Cheng-Chung Natl Cent Univ Thin Film Technol Ctr Dept Opt & Photon Chungli 320 Taiwan Delta Elect Inc Tainan Taiwan

ISBN: (纸本)9780819482822

We have designed and fabricated angle-selective filters to increase the luminous throughput of a blue light emitting diode (LED) and its associated color wheel. The emission direction was tailored to increase the light emission in the useful direction by using multilayer optical coating with alternating high and low refractive indices layers. The angle selective filters limit the luminance angle to less than an acceptance angle of 30 degrees for green and red on the phosphors color wheel. The filters increase the luminance efficiency by converging and recycling the light. The color performance of the phosphors color wheel was improved and gave an advantage of energy saving in the LED projector.

关键词： optical thin film angle selective filter phosphor color wheel Light Emitting Diode

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Multichannel-optical prism 23

Multichannel-optical prism

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

作者： Ryzhikov, Lev 136 Newtown Ave Unit 7 Norwalk CT 06851 USA

ISBN: (纸本)9781510654198;9781510654181

currently, many optical tests required simultaneous measurement values of various technological or metrological parameters. This demand primarily applies to pieces or parts of products that are under variable load during operation. These technological measurements primarily relate to production and metrological works. Examples include optical testing of deformations of parts (e.g., plates) under variable load, shifts of various components of high-precision equipment, and, of course, various metrological measurements of high-precision equipment, such as lithographic machines and different types of measuring and control devices. Simultaneous measurement of the same parameter in different parts of the product allows for to determination of the error (e.g., deformation or alignment error) in object position during operation. Observation and analysis of the position of specific points on the object allow one to judge deviations both in position and deformation of the measured surface. The proposed multichannel optical prism can simultaneously observe several points located on the different parts of the object, as well as monitor their movements and deformations in working conditions. This information allows you to determine the operating conditions of various structural elements during real operation. The multichannel prism should be built into the optical circuit of the measuring (metrological) device. The use of prisms of this type allows simultaneous observation of the movement (deformation) of various parts of the observed objects. Some examples of such kinds of optical devices with a build-in multichannel prism will be discussed below.

关键词： Prisms optical components Measurement devices Metrology Channel projecting optics optical alignment optical circuits optical testing Relays Sensors

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design of a head-mounted display with freeform mirrors 20

Design of a head-mounted display with freeform mirrors

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conference on current developments in lens design and optical engineering XX

作者： Rui, Congshan Zeng, Chunmei Hu, Tiantian Ma, Suodong Soochow Univ Sch Optoelect Sci & Engn Suzhou 215006 Peoples R China Soochow Univ Educ Minist China Key Lab Adv Opt Mfg Technol Jiangsu Prov Suzhou 215006 Peoples R China Soochow Univ Educ Minist China Key Lab Modern Opt Technol Suzhou 215006 Peoples R China

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

A head-mounted display (HMD) requires a large field of view (FOV) and a large exit pupil diameter while maintaining a compact structure. In this paper, we show a head-mounted display design comprising two freeform mirrors covering a 28 degrees full field-of-view with an eye relief of 15mm. The simplified partial differential equation (PDE) method is applied in the design of a two-mirror HMD system. Then the data points on the unknown freeform mirrors are calculated using the rays from multiple fields and are used to construct the freeform mirrors in the HMD system, which is taken as a starting point. This simplified partial differential equation method makes calculations easier. The anamorphic surface and the XY polynomial freeform surface are used in the two freeform mirrors for improving the image quality, respectively. The optimization strategy is also described in detail. The final HMD system operates at F/3.75 with 8mm exit pupil diameter achieving good imaging performance.

关键词： Geometric optical design mirror system design head-mounted display optical freeform surface

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Athermalizing Mounted Doublets With ALLVAR Alloys 25

Athermalizing Mounted Doublets With ALLVAR Alloys

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conference on current developments in lens design and optical engineering XXV

作者： Monroe, James A. Fehlberg, Olivia Zavislan, James M. ALLVAR 1201 East Fayette St Syracuse NY 13210 USA Tucson Adv Design & Assembly Ctr Edmund Opt 2650 E Elvira RdSte 102 Tucson AZ 85756 USA Univ Rochester Inst Opt 480 Intercampus Dr Rochester NY 14627 USA

ISBN: (纸本)9781510679221;9781510679238

Thermal requirements often constrain optical designs resulting in cost or performance compromises. Unless an optical system is designed from the start considering thermal requirements, effects including thermal defocus can become detrimental to the system's real-world performance. Novel negative thermal expansion ALLVAR Alloys enable a new degree of freedom during initial system design or can be used to passively athermalize an existing optical system without having to re-design. This work discusses the analysis and integration of ALLVAR Alloy 30 into an optomechanical housing to athermalize mounted commercial off-the-shelf (COTS) doublets. Calculations for the thermal defocus of the doublets and the requisite opto-mechanics to athermalize each system are first presented. The target athermalization of the doublets is also discussed. The ALLVAR Alloy 30 athermalized doublet assemblies are then manufactured, built, and tested. The results of the as-built data and testing are presented as compared to the thermal defocus analysis. This work demonstrates that an existing optical system design can be athermalized by utilizing an ALLVAR Alloy material in the optomechanical design.

关键词： Athermalization thermal Negative Thermal Expansion ALLVAR Alloy Doublet Optomechanics optomechanical design

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Conception of a cheap infrared camera using a Fresnel lens 15

Conception of a cheap infrared camera using a Fresnel lens

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conference on current developments in lens design and optical engineering XV

作者： Grulois, Tatiana Druart, Guillaume Guerineau, Nicolas Crastes, Arnaud Sauer, Herve Chavel, Pierre Off Natl Etud & Rech Aerosp French Aerosp Lab Chemin Huniere F-91127 Palaiseau France ULIS ZI Iles Cordees F-38113 Voroize France CNRS Inst Opt Lab Charles Fabry F-91127 Palaiseau France

ISBN: (纸本)9781628412192

Today huge efforts are made in the research and industrial areas to design compact and cheap uncooled infrared optical systems for low-cost imagery applications. Indeed, infrared cameras are currently too expensive to be widespread. If we manage to cut their cost, we expect to open new types of markets. In this paper, we will present the cheap broadband microimager we have designed. It operates in the long-wavelength infrared range and uses only one silicon lens at a minimal cost for the manufacturing process. Our concept is based on the use of a thin optics. Therefore inexpensive unconventional materials can be used because some absorption can be tolerated. Our imager uses a thin Fresnel lens. Up to now, Fresnel lenses have not been used for broadband imagery applications because of their disastrous chromatic properties. However, we show that working in a high diffraction order can significantly reduce chromatism. A prototype has been made and the performance of our camera will be discussed. Its characterization has been carried out in terms of modulation transfer function (MTF) and noise equivalent temperature difference (NETD). Finally, experimental images will be presented.

关键词： Thermal imaging microbolometers diffractive lenses low-cost applications

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Caustic surfaces produced by a plane wavefront refracted through cemented doublet lenses 19

Caustic surfaces produced by a plane wavefront refracted thr...

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

作者： Avendano-Alejo, Maximino Carmen Lopez-Bautista, M. Castaneda, Luis Univ Nacl Autonoma Mexico Inst Ciencias Aplicadas & Tecnol Apdo Postal 70-186 Mexico City 04510 DF Mexico Inst Politecn Nacl Escuela Super Med Plan San Luis & Diaz Mirson S-N Mexico City 11340 DF Mexico

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

We study the formation of caustic surfaces produced by cemented doublet lenses, considering a plane wavefront propagating parallel to the optical axis and neglecting the refractive index of the optical cement between two simple lenses which are in contact. We have already seen that the shape of caustic surfaces can represent the monochromatic aberrations that we call image errors;furthermore the shape of the caustic can be modified by changing the parameters of design for two conic lenses in contact, in such a way that if we are able to vanish the caustic, the optical system produces either an image without spherical aberration or longitudinal chromatic aberration reduced, commonly known as spherochromatism. The shape of the caustic surface is a function of the indices of refraction involved in the process of refraction, and all the parameters of two simple lenses. We provide an analytic equation for the caustic surfaces in a meridional plane and an example is presented.

关键词： Caustic Surfaces Cemented doublet lenses optical design Principal Surfaces

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The high contrast performance of an optical vortex coronagraph

The high contrast performance of an optical vortex coronagra...

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conference on current developments in lens design and optical engineering VII

作者： Palacios, David M. Swartzander, G. A., Jr. CALTECH Jet Prop Lab 4800 Oak Grove Dr Pasadena CA 91109 USA Univ Arizona Sch Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)0819463671

The goal of the Terrestrial Planet Finder Mission is to detect and characterize Earth-Re planets. Detection of these faint objects, which appear very close to their parent stars, requires a coronagraph capable of achieving better than 100 starlight suppression within a few Airy rings of the stellar image. The coronagraph is also required to maintain this high stellar extinction over a 100nm spectral bandwidth. To ease requirements on the telescope, a high planet light throughput and low sensitivity to wave front aberrations are also desirable features. An optical vortex coronagraph is a promising candidate architecture, which makes use of a spiral phase plate placed in an intermediate image plane to null out the stellar signal. This architecture has the advantage of high stellar extinction, high planet light throughput, and low sensitivity to wave front aberrations. Here we report the high contrast performance of an optical vortex coronagraph limited by the manufacturability of the spiral phase plate.

关键词： coronagraphs terrestrial planets optical vortices

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optical coatings for the optical concentrator with the prism film 19

Optical coatings for the optical concentrator with the prism...

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

作者： Jaing, Cheng-Chung Wan, Wei-Li Yang, Pao-Keng Ying, Shang-Ping Chen, Bing-Mau Minghsin Univ Sci & Technol Dept Optoelect Syst Engn 1 Xinxing Rd Hsinchu 30401 Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Effects of a coating combination, a prism film and a phosphor layer on the short current of the solar cell in the optical solar concentrator and the illuminance of the sunlight passing through the samples were investigated. The optical solar concentrator was a 50 mm x 50 mm x 5 mm B270 thick glass with its sides connected by a solar cell. The prismatic structure of the prism film had a period of 50 mu m. A phosphor Y560 having an absorption band of 390 nm to 500 nm and emitting from 490 nm to 700 nm was prepared. Six coating combinations applied in this study were composed of optical filters and glass. The optical filters included infrared cut-off, magenta, red, green and blue filters. The deflection angle was between 31 and 33 degrees when the incident sunlight passed through the prism film. The short current of the solar cell in the optical solar concentrator with the prism film, the coating combination and the phosphor layer was largest in this study. Experimental results show that the coating is more suitable for enhancing the short current than the phosphor layer in the optical solar concentrator with the prism film. And the phosphor layer can increase the illuminance of the sunlight passing through the samples due to the human eye sensitivity.

关键词： optical concentrator coating prism film phosphor layer short current illuminance optical filter solar cell

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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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International innovations in optical finishing

International innovations in optical finishing

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conference on current developments in lens design and optical engineering V

作者： Jacobs, SD Univ Rochester Ctr Opt Mfg Rochester NY 14623 USA

ISBN: (纸本)0819454613

Every few years new polishing technologies attempt to make the transition from the research laboratory into the commercial sector. Success awaits any process that is well controlled and predictable (e.g., deterministic), rapid, capable of smoothing to sub-rum rms roughness levels while removing damage from grinding, affordable, and easily implemented. Applicability to different optical materials and a variety of part sizes and shapes is extremely important, but may not be required for a new technology to succeed in a niche market. This paper reviews six innovations in polishing of precision optics: Canon's Super-Smooth Polisher (CSSP) that uses a sub-aperture pitch lap - a relatively mature but important base-line technology;Nikon/Osaka University's RF Plasma Chemical Vaporization Machining (CVM);Epion's Gas Cluster Ion Beam (GCIB) Process;the IOM University of Leipzig/NTGL Ion Beam Finishing (IBF) Technology;Zeeko's "Precessions" Process with a sub-aperture section of an inflatable pad;and QED Technology's Magnetorheological Finishing (MRF) with a magnetic fluid ribbon. The removal mechanism and some recent achievements for each process are discussed.

关键词： optical finishing pitch polishing sub-aperture lap computer numerical control ion beams magnetic fluids

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