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

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Experimental analysis of chemical removal effect in RISA grinding of optical glass 7

Experimental analysis of chemical removal effect in RISA gri...

引用

7th CIRP Conference on Surface Integrity, CSI 2024

作者： Shimodo, Kodai Takamaru, Hinata Chiba, Yusuke Kato, Hidebumi Nagano, Mikinori Fukuta, Masahiko Tanaka, Katsutoshi Watanabe, Kentaro Hamazono, Kazuhisa Kakinuma, Yasuhiro Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Production Headquarters Nikon Corp. 1-10-1 Asamizo-dai Minami-ku Sagamihara252-0328 Japan Nano processing System Division Shibaura Machine C0. Ltd. 2068-3 Ohoka Numazu410-0022 Japan

In the large-aperture lens manufacturing, not only high surface quality but also high productivity is required. From this perspective, Reaction-Induced-Slurry-Assisted grinding (RISA grinding), in which cerium oxide slurry is supplied instead of using general grinding fluid, has been developed to achieve high surface quality at high removal rate. However, the surface profile error becomes large due to chemical removal effect of the cerium oxide slurry. Therefore, the purpose of this study is to experimentally investigate the influence of the chemical removal effect on the surface profile error using AE signals and servo current signals in RISA grinding. First, relation between dwell time and removal depth is analyzed by conducting a basic grinding test without the workpiece rotation. The result shows that the actual removal depth increases with increase of dwell time despite applying the constant depth of cut. Then, zero-cut RISA grinding test is conducted. It is found that the removal process proceeds even though zero-cut grinding, and its removal rate varies according to the wheel feed rate. Furthermore, the amount of cerium oxide abrasives adhered to the grinding wheel can be estimated from the AE signals and servo current signals. © 2024 The Authors. Published by Elsevier B.v.

关键词： Grinding (machining)

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Evaluation of deep learning-generated lens design starting points 11

Evaluation of deep learning-generated lens design starting p...

引用

Conference on current developments in lens design and optical engineering XXI

作者： Cote, Geoffroi Lalonde, Jean-Francois Thibault, Simon Univ Laval Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Lab Vis & Syst Numer Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

Data-driven approaches to lens design have only recently begun to emerge. One particular way in which machine learning, and more particularly deep learning, was applied to lens design was by smoothly extrapolating from lens design databases to provide high-quality starting points for lens designers. This mechanism is used by the web application lensNet (which will be publicly available shortly) whose goal is to provide high-quality starting points that are tailored to the desired specifications, namely the effective focal length, f-number and half field of view. Here, we evaluate more thoroughly the designs that are inferred by lensNet and its underlying deep neural network. We provide a global quantitative assessment of the viability of the designs as well as a more targeted comparison among specific design families such as Cooke triplets and Double-Gauss lenses between expert-designed lenses and their automatically inferred counterparts.

关键词： lens design machine learning deep learning lens design optimization

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Analytic formulation of a spherochromatic collimator lens 11

Analytic formulation of a spherochromatic collimator lens

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Conference on current developments in lens design and optical engineering XXI

作者： Gonzalez-Acuna, Rafael G. Gutierrez-vega, Julio C. Tecnol Monterrey Photon & Math Opt Grp Monterrey Mexico

We introduce a closed-form formula to design a spherochromatic collimator singlet lens. The light for three different wavelengths is collimated at the output of the lens. We test the singlet lens using ray-tracing met... 详细信息

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

关键词： optical design aspheric collimator

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Enabling Enterprise Autonomy Development with a Unified Data Infrastructure

Enabling Enterprise Autonomy Development with a Unified Data...

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Big Data v: Learning, Analytics, and Applications 2023

作者： Dotterrer, Kyle Schramke, Brian A. Ponce-Pore, Abby E.v. Sturzinger, Eric M. Hargrove, Henry Lowrance, Christopher J. Army Artificial Intelligence Integration Center U.S. Army Futures Command PittsburghPA United States Carnegie Mellon University PittsburghPA United States RAND Corporation United States

ISBN: (数字)9781510661592

ISBN: (纸本)9781510661585

Data is the cornerstone of Artificial Intelligence (AI) and Machine Learning (ML) systems. As the Department of Defense (DoD) leverages AI/ML to develop, test, and deploy autonomous vehicle capabilities, management of autonomy data will become increasingly important. Modern sensors on autonomous vehicles generate an enormous amount of data, and making this data available for further research presents a significant challenge. Moving such large volumes of data from a field environment to a centralized, cloud-based data lake is not straightforward, nor necessarily efficient for data of unknown enterprise utility. As a result, much of DoD’s autonomy data remains siloed in geographically or logically separated on-premises and cloud-based data stores in mixed formats. Organizations within DoD’s modernization enterprise require a mature data infrastructure to store, discover, share, and collaborate upon datasets, models, and other artifacts efficiently. In this paper, we examine the characteristics a data infrastructure must exhibit to meet the needs of the DoD for autonomy research. These characteristics are identified through a review of existing solutions, use cases, and current industry best practices. On the basis of this review, we propose a set of requirements for DoD’s data infrastructure for autonomous systems research. Moreover, an analysis of the viability of various options, including centralized and decentralized architectures, is provided through the lens of DoD data requirements and unique organizational constraints. While data infrastructure for autonomy is our primary concern, the requirements and design we propose generalize to other AI tasks that are of interest to DoD. © 2023 SPIE.

关键词： Information management

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Wide angle lens with improved relative illumination characteristics 11

Wide angle lens with improved relative illumination characte...

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Conference on current developments in lens design and optical engineering XXI

作者： Zhuang, Zhenfeng Dallaire, Xavier Parent, Jocelyn Roulet, Patrice Thibault, Simon Immervision 2020 UnivSuite 2320 Montreal PQ H3A 2A5 Canada Univ Laval Ctr Opt Photon & Laser Dept Phys Genie Phys & Opt 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

Consumers nowadays have a higher expectation on cameras beyond the function of taking photos or videos. In the early years, the applications of cameras with lenses were, however, very restricted. A new generation of super wide-angle lenses capture the user's surroundings in full 360 degrees, allowing the user's friends or families to step inside our universe and experience it, live. However, for such wide angle lens coverage, the relative illumination of the lens must take the vector nature of the light into account. Consequently, the polarization of light becomes a critical parameter. Custom coatings are commonly spread on the lens surface to avoid light transmission polarization falloff. But for consumer applications, complex coating is not a practical solution because it raises cost. In this paper, we present how to take care of the polarization during the design and analysis of the lens design. Additionally, design tips are proposed to suppress the polarization impact.

关键词： 080.3620) lens system design (120.4820) optical systems (260.5430) Polarization (080.2740) Geometric optical design (220.1250) Aspherics

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The entrance pupil of an on-axis stigmatic singlet lens 11

The entrance pupil of an on-axis stigmatic singlet lens

引用

Conference on current developments in lens design and optical engineering XXI

作者： Gonzalez-Acuna, Rafael G. Gutierrez-vega, Julio C. Tecnol Monterrey Photon & Math Opt Grp Monterrey 64849 Mexico

We derive a closed-form expression for the entrance pupil of the on-axis stigmatic singlet lens, and discuss its performance for a variety of conditions, including positive or negative indices of refraction, and diffe... 详细信息

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

关键词： optical design spherical aberration telescopes aberration theory

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A Monolithic optical Sensor for IoT Devices Proximity-Detection 2

A Monolithic Optical Sensor for IoT Devices Proximity-Detect...

引用

2nd International Conference on Electrical engineering and Control Science, IC2ECS 2022

作者： Ran, Qianfan Zhang, Xudong Song, Chaoyang Li, Yuan Lin, Zhihong Chiang, Patrick Yin Fudan University State Key Laboratory of ASIC and System Shanghai China

ISBN: (纸本)9798350399165

Nowadays, low power consumption is one of the key developments in mobile internet-of-Things (IoT) devices proximity-detection. A low power monolithic CMOS optical sensor is presented in this article. The prototype sensor uses an auto-zero and correlated double sampling (CDS) based sample and hold (S/H) stage, which reduces low frequency noise as well as the op-Amp DC offset and photodiode (PD) dark current and also serves as a single-ended-To-differential converter. A third-order single-bit delta sigma ADC is implemented to attain high resolution proximity sensing. The optical sensor is fabricated with a 0.18 m CMOS process. The die size is 0.7∗1.2 mm2 and the chip scale package dimensions are only 0.7 mm3, showing high industrial design flexibility of sensor apertures sizes and shapes. The sensor draws an average current of 200 A from a 1.8 v supply during the active state. Tested under a 90% reflectance panel, the measurement results show a proximity distance of 20 mm and a resolution of 0.5 mm, which makes it a practical approach to proximity sensing in IoT devices. © 2022 IEEE.

关键词： Internet of things

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Optimization of a mobile phone camera for as-built performance 11

Optimization of a mobile phone camera for as-built performan...

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Conference on current developments in lens design and optical engineering XXI

作者： Joo, Joonha Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

The work presented here shows a compact lens system that demonstrates improved imaging quality performance while focusing on as-built performance and design for manufacturing. Using Zemax, we consider an approach for optimizing for as-built performance and incorporate the approach into the design process for a mobile phone camera. The optimized design consists of 6 plastic aspheric lenses, an infrared glass filter, and a 12 MP CMOS image sensor. The optical system demonstrates high-resolution imaging and has a field-of-view of 87.6 degrees, an F-number of 2.0, a maximum distortion of less than 2.5%, and a total track length of 6.630 mm.

关键词： optical design Optimization Tolerancing design for manufacturing Zemax

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NEW developments OF MULTILINEAR AND MULTISPECTRAL INFRARED SENSORS FOR SPACE APPLICATIONS AT LYNRED

NEW DEVELOPMENTS OF MULTILINEAR AND MULTISPECTRAL INFRARED S...

引用

2022 International Conference on Space Optics, ICSO 2022

作者： Jamin, N. Salvetti, F. Baud, L. Berthoz, J. Martineau, L. Bourrillon, v. Lopez, P. Chorier, P. LYNRED Actipole - CS 10021 364 route de Valence Veurey-Voroize38113 France

ISBN: (纸本)9781510668034

LYNRED is a global leader in designing and manufacturing high quality infrared technologies for aerospace, defence and commercial markets. Its vast portfolio of infrared detectors covers the entire electromagnetic spectrum from near to very far infrared, especially thanks to well-mastered wavelength tuneable MCT technology. In addition, space radiation resilience of MCT technology enables LYNRED to be the leading European manufacturer for IR detectors deployed in space. One noticeable recent trend associated to space detectors market is the increase of requested multilinear/multispectral array format (from around 1000 up to 4000 photo-elements) combined with a high frame rate need (frame time from 100μs up to several hundred of μs). However, these characteristics are generally not compatible with the current windowed 2D-large sensors off-the-shelf offer of space market especially due to technical different operating points between 2D and linear sensors. Therefore, specific recent developments have been triggered by LYNRED in order to better suit future pushbroom (generally based on several multilinear arrays) or whiskbroom (generally based on one multilinear array) instrument concepts. One of the main challenges of this portfolio extension is to design a multilinear sensor space product line not only based on space proven building blocks heritage but also on delayed differentiation approach as much as possible. This design orientation will enable to fit optimally to the widest range of space instruments needs in a reduced time. First of all, multilinear/multispectral sensors development is based on two pillars addressing two segments of applications in terms of flux and spectral ranges. Even if the segmentation of space application for multilinear sensor is not strictly binary, the first segment concerns Low Flux applications (named LF) whereas the second one is dedicated to High Flux (named HF). LF applications being mainly dedicated to SWIR and MWIR spectral range

关键词： Infrared detectors

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optical design of triple-mode seeker 11

Optical design of triple-mode seeker

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Conference on current developments in lens design and optical engineering XXI

作者： Sakarya, Dogan Ugur Kucukcelebi, Doruk Tact Missile Syst Grp TR-06780 Roketsan Elmadag Ankara Turkey

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In missile applications, new counter measure methods are getting more complex. To discriminate and detect counter measure and to understand target signature from scene is getting harder. Because of all that concerns, using triple-mode seeker for a system solution is a good solution for system total performance. By this way, tri-different wavelength could be used for same system and same scene. In this study, triple mode system's optical designs have been made for mid-wave infra-red imaging, long-wave infra-red imaging and short-wave infrared imaging. optical designs performances have been illustrated in simulation results. Finally, conceptual design of triple mode seeker will be summarized.

关键词： Triple mode seeker mid wave infrared long wave infrared short wave infrared optical design

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