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共 338 条记录，以下是61-70 订阅

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design method for automotive high-beam LED optics 4

Design method for automotive high-beam LED optics

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spie 4th European Illumination optics conference

作者： Byzov, Egor V. Moiseev, Mikhail A. Doskolovich, Leonid L. Kazanskiy, Nikolay L. Russian Acad Sci Image Proc Syst Inst Samara 443001 Russia Samara State Aerosp Univ Samara 443086 Russia LED Opt Design LLC Samara 443001 Russia

ISBN: (纸本)9781628418187

New analytical method for the calculation of the LED secondary optics for automotive high-beam lamps is presented. Automotive headlamps should illuminate the road and the curb at the distance of 100-150 meters and create a bright, flat, relatively powerful light beam. To generate intensity distribution of this kind we propose to use TIR optical element (collimator working on the total internal reflection principle) with array of microlenses (optical corrector) on the upper surface. TIR part of the optical element enables reflection of the side rays to the front direction and provides a collimated beam which incidents on the microrelief. Microrelief, in its turn, dissipates the light flux in horizontal direction to meet the requirements of the Regulations 112, 113 and to provide well-illuminated area across the road in the far field. As an example, we computed and simulated the optical element with the diameter of 33 millimeters and the height of 22 millimeters. Simulation data shows that three illuminating modules including Cree XP-G2 LED and lens allow generating an appropriate intensity distribution for the class D of UNECE Regulations.

关键词： secondary optics nonimaging optics automotive headlights TIR-optics LED optics refractive surface design

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Capabilities and design parameters for volume holographic optical elements in imaging systems

Capabilities and design parameters for volume holographic op...

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computational optical Sensing and Imaging, COSI 2020 - part of Imaging and Applied optics Congress 2020

作者： Kostuk, Raymond K. Electrical and Computer Engineering Department College of Optical Sciences University of Arizona TucsonAZ85721 United States

New forms of imaging modalities such as selective imaging and augmented reality eyewear, place special requirements on the optics used in these systems. This presentation reviews the properties of volume holographic m... 详细信息

ISBN: (纸本)9781557528209

关键词： Augmented reality

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Software system design for the non-null digital Moire interferometer 4

Software system design for the non-null digital Moire interf...

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conference on optical Metrology and Inspection for Industrial Applications IV held as part of spie/COS Photonics Asia conference

作者： Chen, Meng Hao, Qun Hu, Yao Wang, Shaopu Li, Tengfei Li, Lin Beijing Inst Technol Beijing Key Lab Precis Optoelect Measurement Inst Sch Optoelect Beijing 100081 Peoples R China

ISBN: (数字)9781510604667

ISBN: (纸本)9781510604650;9781510604667

Aspheric optical components are an indispensable part of modern optics systems. With the development of aspheric optical elements fabrication technique, high-precision figure error test method of aspheric surfaces is a quite urgent issue now. We proposed a digital Moire interferometer technique (DMIT) based on partial compensation principle for aspheric and freeform surface measurement. Different from traditional interferometer, DMIT consists of a real and a virtual interferometer. The virtual interferometer is simulated with Zemax software to perform phase-shifting and alignment. We can get the results by a series of calculation with the real interferogram and virtual interferograms generated by computer. DMIT requires a specific, reliable software system to ensure its normal work. Image acquisition and data processing are two important parts in this system. And it is also a challenge to realize the connection between the real and virtual interferometer. In this paper, we present a software system design for DMIT with friendly user interface and robust data processing features, enabling us to acquire the figure error of the measured asphere. We choose Visual C++ as the software development platform and control the ideal interferometer by using hybrid programming with Zemax. After image acquisition and data transmission, the system calls image processing algorithms written with Matlab to calculate the figure error of the measured asphere. We test the software system experimentally. In the experiment, we realize the measurement of an aspheric surface and prove the feasibility of the software system.

关键词： asphere test DMIT virtual interferometer software system design data processing hybrid programming

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design and Analysis of Natural Light Guiding CPC Structure Used for Indoor Illumination

Design and Analysis of Natural Light Guiding CPC Structure U...

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5th conference on Nonimaging optics and Efficient Illumination systems

作者： Chen, Yi-Yung Huang, Wei Whang, Allen Jong-Woei NTUST Dept Elect Engn Taipei Taiwan NTUST Grad Inst Electroopt Engn Dept Elect Engn Taipei Taiwan NTUST IBRC Taipei Taiwan

ISBN: (纸本)9780819472793

We have designed an optical component to collect sunlight for indoor illumination. We use a CPC structure utilizing the edge-ray principle to design the collecting part to gather sunlight at many different angles, without a sun tracking system. The CPC structure was designed with the sun condition in Taipei each season. For the maximum efficiency, we define two conditions to evaluate the static concentrator is total energy saving in the visible range.

关键词： Indoor Illumination Static Concentrator CPC Structure Wide Collecting Angle

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Tolerancing Free Form optics for Illumination

Tolerancing Free Form Optics for Illumination

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conference on Illumination optics II

作者： Timinger, A. Unterhinninghofen, J. Junginger, S. Hofmann, A. OEC AG D-80337 Munich Germany

ISBN: (纸本)9780819487964

Free form surfaces allow elegant solutions in illumination optics. A complex function of the system can be achieved by a single optical element. Free form elements are usually manufactured by reproduction techniques, such as injection moulding of plastic. Manufacturing tolerances are crucial to maintain the required function while at the same time yielding the lowest possible price. We implemented a Monte Carlo tolerancing method for illumination systems. Tolerances include shape deviations of optical elements and assembly tolerances. In the absence of standards for free form tolerances and illumination optics tolerancing, communication between optics design, manufacturing and testing is often inefficient. In order to enable a highly automated evaluation of part measurement data to assess compliance with tolerances, we developed an approach to combine information from optics design, mechanical construction, manufacturing and testing into one continuous data chain. The research project is granted by the German Ministry of Education and Research.

关键词： Tolerancing illumination free form optics Monte-Carlo methods

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Advanced high-power laser diode combination design for laser scanning applications 6

Advanced high-power laser diode combination design for laser...

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Smeesters, Lien Thienpont, Hugo Meulebroeck, Wendy Vrije Univ Brussel Pl Laan 2 B-1050 Brussels Belgium Flanders Make Dept Appl Phys & Photon Brussels Photon B PHOT Pl Laan 2 B-1050 Brussels Belgium

ISBN: (纸本)9781510645936;9781510645929

Laser cutters and engraving devices traditionally feature a high-power CO 2 laser in combination with a scanning unit. However, within the laser processing industry, a growing interest arose in the use and combination of laser diode sources, enabling a more compact design featuring a longer estimated lifespan. Therefore, we investigate and compare different laser diode combination configurations, while evaluating their applicability in a compact laser scanning configuration. Specifically, as a case study, we target the combination of 4 high-power laser diodes, pursuing a collimated, homogenous and symmetrical output beam, while minimizing light losses. An optimal laser diode combination design was achieved by use of aspherical lenses, knife-edge mirrors and a polarizing beam splitter. Two laser diodes are oriented to emit p-polarized light, while the other emit s-polarized light. In front of each laser diode, an aspherical lens is mounted to collect and collimate the laser beam. The two collimated s-polarized laser beams and the two p-polarized beams are each combined using a knife-edge mirror, after which the s- and p-polarized beam are combined by a polarizing beam splitter, giving rise to a single collimated output beam that can be used as input for the scanning unit. Following the optimization and tolerancing of the design, the laser diode combination system was successfully demonstrated in a proof-of-principle laboratory configuration indicating a homogeneous and collimated illumination beam at the entrance of the scan head, paving the way towards the integration and combination of multiple laser diode sources for use in high-power laser cutting and marking applications.

关键词： laser cutting laser diode array illumination design beam shaping beam collimation laser diode circularization knife-edge mirror polarizing beam combiner

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Achieving multiple beam patterns using 3-D printed lens by changing the position of LEDs 23

Achieving multiple beam patterns using 3-D printed lens by c...

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conference on Current Developments in Lens design and optical Engineering XXIII part of spie optics and Photonics conference

作者： Udage, Akila S. Narendran, Nadarajah Rensselaer Polytech Inst Lighting Res Ctr 21 Union St Troy NY 12180 USA

ISBN: (纸本)9781510654198;9781510654181

As lighting has diversified across many applications, optical designers have been challenged to produce application-specific optical systems. For an instance where multiple beam distributions are required in an application, instead of making individual lenses catering to different beam shapes, it would be beneficial to create a single optic that can be used with different LED source positioning. Hence, this study proposes a method of positioning LEDs in a fixture to achieve multiple beam patterns using a fixed lens design. Through ray-tracing analysis, we showed that different beam distributions could be obtained by changing the LED position in a refractive lens array. The experimental study was conducted with a 3D-printed lens to validate the model. The results confirm the possibility of creating a single fixed lens to achieve multiple beam distributions via different LED positioning. The proposed novel method can replace the expensive and cumbersome process of developing separate lenses for each beam distribution. Further, our experimental results can guide fixture manufacturers on the use of 3D-printed optics for lighting applications.

关键词： Beam shaping Multiple beams Lighting 3D printing optics Additive manufacturing

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design of the laser beam transfer system for the new Gemini North adaptive optics laser guide star 8

Design of the laser beam transfer system for the new Gemini ...

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Schneider, Thomas Marin, Eduardo Cavedoni, Charles Carr, Heather Ebbers, Angelic Kang, Stacy Karewicz, Stan Tomasino-Reed, Kimberly Sivo, Gaetano Lazo, Manuel Rambold, William D'Amato, Joseph Chinn, Brian Blain, Celia NSFs Natl Opt Infrared Astron Res Lab Gemini Observ La Serena Chile WM Keck Observ Waimea HI USA

ISBN: (纸本)9781510653528;9781510653511

In 2018 the Gemini Observatory was awarded by the NSF a large grant for the Gemini in the Era of Multi Messenger Astronomy (GEMMA) project to build the next generation laser AO system from Gemini North. This new system is tentatively called Gemini North Adaptive optics (GNAO) and will be a flexible AO system that can run multiple types of AO correction and serve as a facility capable of feeding multiple science cameras. As part of this new system the Laser Guide Star Facility (LGSF) of Gemini North is being completely redesigned from a single laser single Laser Guide Star (LGS) beacon facility into a multi-laser multi LGS beacon facility. It will be able to generate from 0-4 LGS on sky to feed not only GNAO but potential future systems as well. The LGSF consists of 3 main components, 589 nm sodium lasers, a set of free space beam transfer optics, and Laser Launch Telescopes (LLT). The sodium lasers and the LLT are contracted out to external vendors while the beam transfer optics are being designed and built in house. The new beam transfer optics are called the Beam Expander and Control Node (BEaCoN) and function as the link between the two contracted products. Within the BEaCoN the laser beam is split, expanded, and steered before being injected into the LLT. This report covers the design and analysis of the BEaCoN optical bench.

关键词： AO Laser LGS

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Predicting Color Separation and designing Color Mixing Optic Solutions

Predicting Color Separation and Designing Color Mixing Optic...

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2023 International optical design conference, IODC 2023

作者： Frydendall, Eric LTI Optics LLC 10850 Dover Street Suite 300 WestminsterCO80021 United States

Using full spectral source models with detailed color properties, the color separation of an optical system can be predicted, thus allowing solutions for color mixing to be tested virtually. © 2023 spie.

ISBN: (数字)9781510668515

ISBN: (纸本)9781957171227

关键词： optical systems

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optical RECEIVER FOR IM-DD systems OPERATING AT 2.488 GBIT/S

OPTICAL RECEIVER FOR IM-DD SYSTEMS OPERATING AT 2.488 GBIT/S

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conference on design, Simulation, and Fabrication of Optoelectronic Devices and Circuits, part of spie OE/LASE 94 Symposium

作者： COCCO, V GATTI, G MARIETTI, P PARAFIORITI, G ROTOLO, S TRIFILETTI, A UNIV ROMA LA SAPIENZA DIPARTIMENTO INGN ELETTRONI-00184 ROMEITALY

ISBN: (纸本)081941445X

In this paper we present the design approach and measurements of an optical receiver suited for IM-DD systems operating up to 2.5 Gbit/s bit-rate. The receiver is composed by a Ga-As MMIC transimpedance amplifier and a commercially available pin photodiode. The MMIC amplifier has been fabricated and it has been measured on wafer, showing a -3 dB cut- off frequency of 2.6 GHz, stability and low sensitivity to bias variations.

关键词： Receivers optical amplifiers Field effect transistors Photodiodes Wafer-level optics Amplifiers Capacitors Digital filtering PIN photodiodes Semiconducting wafers

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