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

共 530 条记录，以下是221-230 订阅

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Development of multi-spectral lenses for thermal imaging technique

Development of multi-spectral lenses for thermal imaging tec...

引用

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

作者： Bezdidko, Sergey N. Morozova, Elena, I Roy, Yuri A. Open Joint Stock Co Res & Prod Corp Precis Syst & Instruments Moscow Russia

ISBN: (纸本)9780819487384

The modern level of development of optoelectronic devices requires the creation of optoelectronic devices, providing maximum information content in different weather conditions, day and night. The solution to this problem is possible only through the creation of optoelectronic devices operating in various ranges of the optical spectrum simultaneously (multi-spectral electro-optical devices). The report presents the results of work on the creation of thermal lenses, working simultaneously in two regions of the spectrum of 3-5 microns and 8-12 microns, shows the results of the specific development of such lenses and their aberration characteristics.

关键词： lens deign IR high-speed infrared lenses malty-spectral range

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Development and Experimental Verification of an Intraocular Scattering Model

Development and Experimental Verification of an Intraocular ...

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

作者： Jiang, Chong-Jhih Jhong, Tian-Siang Chen, Yi-Chun Sun, Ching-Cherng Natl Cent Univ Dept Opt & Photon Jhongli 320 Taiwan

ISBN: (纸本)9780819487384

An intraocular scattering model was constructed in human eye model and experimentally verified. According to the biometric data, the volumetric scattering in crystalline lens and diffusion at retina fundus were developed. The scattering parameters of cornea, including particle size and obscuration ratio, were varied to make the veiling luminance of the eye model matching the CIE disability glare general formula. By replacing the transparent lens with a cataractous lens, the disability glare curve of cataracts was generated and compared with that of transparent lenses. The MTF of the intraocular scattering model showed nice correspondence with the data measured by a double-pass experiment.

关键词： intraocular scattering volumetric scattering veiling luminance disability glare cataractous lens double pass

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design of a free-form lens system for short distance projection

Design of a free-form lens system for short distance project...

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

作者： Yang, Bo Lu, Kan Zhang, Wei Dai, Fujian Shanghai Univ Sci & Technol Shanghai Key Lab Contemporary Opt Syst Sch Opt Elect & Comp Engn Shanghai 200093 Peoples R China Zhejiang Sunny Opt Co Ltd R&D Dept Yuyao 315400 Zhejiang Peoples R China

ISBN: (纸本)9780819487384

A free-form lens system design is proposed for short distance projection. Free-form surface shape and non-rotational symmetrical structure provide us more freedoms for optimization. The catadioptric structure is also used to reduce the overall length of the whole system. The designed projector lens system consists of two parts. The first part is a rotationally symmetrical lens system which corrects the basic aberrations. The second part contains a free-form lens and a reflector which correct the distortion and other aberrations. We achieve 55inch projected image size at a display screen which is 300mm away from the lens system. The maximum distortion for all fields at all distances is less than 3%.

关键词： optical engine Projection lens Free-form Catadioptric Least-square fitting

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Progressive addition lens design by optimizing NURBS surface

Progressive addition lens design by optimizing NURBS surface

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

作者： Liu, Yen-Liang Hsu, Wei-Yao Cheng, Yuan-Chieh Su, Guo-Dong Natl Taiwan Univ Grad Inst Photon & Optoelect 1Sec 4Roosevelt Rd Taipei 10617 Taiwan Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819487384

Progressive addition lenses (PAL) are used to compensate presbyopia, which is induced by losing accommodation of elder eyes. These eyes need different optical power provided by eye glasses while watching objects at different distance. A smaller optical power is required in further distance and a larger one in nearer zone. A progressive addition lens can provides different power requirements in one piece of lens. This paper introduces a whole process of PAL production, from design, fabrication, to measurement. The PAL is designed by optimizing NURBS surface. Parameters of merit function are adjusted to design lenses with different specifications. The simulation results confirm that the power distributes as expected and cylinders are controlled under an acceptable level. Besides, sample lenses have been produced by injecting polycorbonate to the molds. Finally, Ultra Accuracy 3D Profilemeter is used to measure the sample PALs. Practical examinations shows that our designs are achievable and feasible in practice use.

关键词： progressive addition lens NURBS precision machining ultrahigh accurate 3 dimensional profilemeter UA3P

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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...

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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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current developments in lens design and optical engineering XII;and Advances in Thin Film Coatings VII

Current Developments in Lens Design and Optical Engineering ...

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current developments in lens design and optical engineering XII;and Advances in Thin Film Coatings VII

ISBN: (纸本)9780819487384

The proceedings contain 18 papers. The topics discussed include: linear systems formulation of image analysis in the presence of both aberrations and surface scatter;transmission losses in infrared anti-reflection coatings due to water absorption;design of a free-form lens system for short distance projection;progress in the SMS design method for imaging optics;distributed wavefront coding for wide angle imaging system;progressive addition lens design by optimizing NURBS surface;testing and design of a low-cost large scale solar simulator;effects of substrate heating and vacuum annealing on optical and electrical properties of alumina-doped ZnO films deposited by DC magnetron sputtering;and the research of relationships between residual stress and columnar angles in oblique deposition of magnesium fluoride thin films.

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developments in modern panoramic lenses: lens design, controlled distortion and characterization

Developments in modern panoramic lenses: lens design, contro...

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International conference on optical Instruments and Technology (OIT) - optical systems and Modern Optoelectronic Instruments

作者： Thibault, Simon Parent, Jocelyn Zhang, Hu Lariviere-Bastien, Martin Poulin-Girard, Anne-Sophie Arfaoui, Aymen Desaulniers, Pierre Univ Laval COPL Dept Phys Genie Phys & Opt Quebec City PQ G1V 0A6 Canada

ISBN: (纸本)9780819488381

Almost every aspect concerning the design of modern panoramic lenses brings new challenges to optical designers. Examples of these include ray tracing programs having problems finding the entrance pupil which is moving through the field of view, production particularities due to the shape of the front lenses, ways of tolerancing these systems having strong distortion, particular setups required for their characterization and calibration, and algorithms to properly analyze and make use of the obtained images. To better understand these modern panoramic lenses, the optical engineering Research Laboratory at Laval University has been doing research on them during the past few years. The most significant results are being presented in this paper. Controlled distortion, as in commercial panomorph lenses (Immervision), is used to image a specific part of the object with more pixels than in a normal fisheye lens. This idea is even more useful when a zone of interest vary in time with dynamically adjustable distortion as in a panoramic locally magnifying imager. Another axis of research is the use of modern computational techniques such as wavefront coding in wide-angle imaging systems. The particularities of such techniques when the field of view is large or with anamorphic imagers are considered. Presentation of a novel circular test bench in our laboratories, required to calibrate and check the image quality of wide-angle imaging system, follows. Another presented setup uses a laser and diffractive optical elements to compactly calibrate wide-angle lenses. Then, a discussion of the uniqueness in tolerancing these lenses, especially the front elements due to the large ratio between lens diameter and entrance pupil diameter, is included. Lastly, particularities with polarization imaging and experiments of triangle orientation detection tests before and after unwrapping the distorted images are briefly discussed.

关键词： optical design wide-angle lens panoramic panomorph distortion

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Proceedings of SPIE - The International Society for optical engineering: Introduction

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

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current developments in lens design and optical engineering XII;and Advances in Thin Film Coatings VII

作者： Johnson, R. Barry Mahajan, Virendra N. Thibault, Simon Alabama A and M University United States Aerospace Corporation United States ImmerVision Canada University Laval Canada

This PDF file contains the front matter associated with SPIE Proceedings Volume 8128, including the Title Page, Copyright information, Table of Contents, Introduction, and the conference Committee listing. © 2011... 详细信息

ISBN: (纸本)9780819487384

关键词： optical engineering

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Testing and design of a low-cost large scale solar simulator

Testing and design of a low-cost large scale solar simulator

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

作者： Meng, Qinglong Wang, Yuan Changan Univ Sch Environm Sci & Engn 12 Yanta Rd Xian 710054 Shaanxi Provinc Peoples R China Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Shaanxi Provinc Peoples R China

ISBN: (纸本)9780819487384

To simulate solar radiation at the earth's surface, a new economical multiple-lamp solar simulator was designed. The solar simulator is comprised of 188 reflector sunlight dysprosium lamps whose light spectrum is very similar to air mass 1.5 (AM1.5) solar spectrum terrestrial standards. Lamps are configured in a hexagonal pattern with 15 columns of 12 or 13 lamps at a lamp-to-lamp spacing and column-to-column spacing of 295mm. Without altering the radiation spectral distribution, the average irradiance on target irradiated area can be adjusted over a wide range between 150 and 1100W/m(2) by means of the variation of lamps number or/and lamp-to-irradiated area distance. At the height of 2.0m the solar simulator provides 2mx1.5m irradiated area with over 1000 W/m(2). Measurement of irradiance indicates that the multiple-lamp simulator conforms to Class B of ASTM (American Society for Testing and Materials) Standard (ASTM E927-2005) in regard to spectrum match, irradiance uniformity and stability. To enlarge the effective irradiated area, two large mirror-like stainless steel plates was mounted on both of the long sides of the solar simulator. The radiation characteristics of simulator are improved and the optimized effectively irradiation surface is expanded up to 81.6%.

关键词： solar simulator irradiance nonuniformity temporal instability

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