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19th Conference on current developments in Lens design and optical engineering

作者： Brand, Audrey C. Alisafaee, Hossein Rose Hulman Inst Technol Dept Phys & Opt Engn 5500 Wabash Ave Terre Haute IN 47803 USA

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

We have designed a light-guide for lighting applications, including automotive headlamps. The light-guide is designed based on a free-form slab. Our intention has been to optimize the design for creating legal patterns. One of our objectives has been to investigate how the changes in the shape of the freeform light-guide affects the light pattern, and how the light source geometry affects the design. For prototyping purpose, we use a particular polymer that exhibits optical performance close to acrylic (PMMA).

关键词： Automotive Lighting Lighting Light-guide optical design Illumination

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Coronary artery segmentation from intravascular optical coherence tomography using deep capsules

arXiv

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arXiv 2020年

作者： Balaji, Arjun Kelsey, Lachlan J. Majeed, Kamran Schultz, Carl J. Doyle, Barry J. Vascular Engineering Laboratory Harry Perkins Institute of Medical Research QEII Medical Centre Nedlands and Centre for Medical Research The University of Western Australia Perth Australia School of Engineering The University of Western Australia Perth Australia Department of Cardiology Royal Perth Hospital Perth Australia School of Medicine The University of Western Australia Perth Australia University of Ottawa Heart Institute OttawaON Canada Australian Research Council Centre for Personalised Therapeutics Technologies Australia British Heart Foundation Centre for Cardiovascular Science The University of Edinburgh United Kingdom

The segmentation and analysis of coronary arteries from intravascular optical coherence tomography (IVOCT) is an important aspect of diagnosing and managing coronary artery disease. current image processing methods are hindered by the time needed to generate expert-labelled datasets and the potential for bias during the analysis. Therefore, automated, robust, unbiased and timely geometry extraction from IVOCT, using image processing, would be beneficial to clinicians. With clinical application in mind, we aim to develop a model with a small memory footprint that is fast at inference time without sacrificing segmentation quality. Using a large IVOCT dataset of 12,011 expert-labelled images from 22 patients, we construct a new deep learning method based on capsules which automatically produces lumen segmentations. Our dataset contains images with both blood and light artefacts (22.8%), as well as metallic (23.1%) and bioresorbable stents (2.5%). We split the dataset into a training (70%), validation (20%) and test (10%) set and rigorously investigate design variations with respect to upsampling regimes and input selection. We show that our developments lead to a model, DeepCap, that is on par with state-of-the-art machine learning methods in terms of segmentation quality and robustness, while using as little as 12% of the parameters. This enables DeepCap to have per image inference times up to 70% faster on GPU and up to 95% faster on CPU compared to other state-of-the-art models. DeepCap is a robust automated segmentation tool that can aid clinicians to extract unbiased geometrical data from IVOCT. © 2020, CC BY.

关键词： optical tomography

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design and analysis of the mirror system with off-axis field-of-view 19

Design and analysis of the mirror system with off-axis field...

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19th Conference on current developments in Lens design and optical engineering

作者： Romanova, Galina E. Rodionova (Butylkina), Kseniia D. ITMO Univ 49 Kronverkskiy Pr St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Nowadays, the development of the space apparatus with high optical characteristics still stays the important task. The simplest systems which can provide the required characteristics for remote monitoring from the space are the three-mirror systems. It can be shown that in many cases, classical three-mirror systems have critical value of obscuration that leads to decreasing of resolution. Using off-axis field of view in the systems provides the way to avoid the obscuration influence. We present a technique for designing the three-mirror telescope objectives based on the systems with axial symmetry with an off-axis field of view.

关键词： mirror telescopes off-axis field of view optical design

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Various Issues and considerations for the Static Power Consumption in NANO-CMOS: design Perspective

Various Issues and considerations for the Static Power Consu...

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International Conference on NanoTechnology in Energy, Nano-Bio Interface and Sustainable Environment (INTENSE)

作者： Yadav, Ashwani Kumar Upadhyay, Kartik Gandhi, Palak Vaishali Amity Univ Rajasthan Amity Sch Engn & Technol NH-11CJaipur Delhi Highway Jaipur 303002 Rajasthan India

Now a days designing techniques are very much concerned about the leakage currents reduction at different stages of abstraction. Leakage reduction strategies can be categorized on the basis of their effectiveness and output rate of 3 major classes: enhanced devices, trade off techniques, and leakage management. Static power consumption by the leakage currents is the main issue in CMOS ICs with gate lengths of 90 nm and less than that. Generally, the procedure allied with deviation may extensively amplify the whole amount of static current usage rate. The prime sources of variability are changes in: (i) changes in channel dimensions, (ii) changes in oxide thickness (iii) changes in channel doping profiles. Channel aspect of transistor in profound submicron technologies are subjected to the "classical" optical resolution bound. The 90 nm or 65 nm channel length is defined with wavelength of lower UV of 193 nm (or 157 nm). Static current expenditure has turn out to be extremely significant issue for the developers of lower submicron CMOS process and for designers of circuits. As the length of gate and threshold voltage reduces the subthreshold drain current rises significantly. Other components of the total static current consumption, such as gate tunneling currents, also come into existence. These issues have been covered in this work very effectively from designing perspective. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Nano CMOS Leakage current Power Consumption design paramenters

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Laser scanners with oscillatory elements: design and optimization of 1D and 2D scanning functions

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APPLIED MATHEMATICAL MODELLING 2019年 67卷 456-476页

作者： Duma, Virgil-Florin Aurel Vlaicu Univ Arad 30M Optomechatron Grp 77 Revolutiei Ave Arad 310130 Romania Polytech Univ Timisoara Doctoral Sch 1 Mihai Viteazu Ave Timisoara 300222 Romania

Optomechatronic laser scanners with oscillatory mirrors, built as galvanometer scanners (GSs) or as Micro-Electro-Mechanical Systems (MEMS) are approached from the point of view of their scanning functions. The non-linearity of the 1D scanning functions which are the output signals of such scanners (i.e., the current angular position of their oscillatory mirrors) are first discussed for the three most common input signals (triangular, sawtooth, and sinusoidal), for which the effective duty cycle/time efficiency (of the output) was modeled using optical Coherence Tomography (OCT) imaging, in contrast to the theoretical duty cycle (of the input). Second, optimal linear plus non-linear 1D scanning functions are designed, with specially introduced parabolic portions, in order to maximize the duty cycle of the scanning process and to provide the most distortion-free scanning, for example for OCT. A trade-off is also discussed between this duty cycle and the peaks of the voltage that has to be applied to the motor of the scanner, in order to minimize these peaks and thus to protect the system from an electrical point of view. Finally, using all the results above, both angular and linear 2D scanning functions are designed and analyzed, for their possible variants. For the fast scan axis the triangular 1D functions obtained above (with or without non-linear portions introduced between the constant speed, useful scan) are utilized. For the slow scan axis the two most utilized scanning algorithms are employed: with a step-by-step or with a continuous angular movement. The characteristic parameters of their different variants are analyzed in order to optimize these scanning functions. We demonstrate that the step-by-step angular movement is the best one, in order to avoid producing acceleration (therefore inertia torque and voltage) spikes. Equations that avoid such issues are proposed. These developments are placed in the context of the requirements of high-end applications l

关键词： Laser scanners Oscillatory systems Galvanometer scanners (GSs) Micro-Electro-Mechanical Systems (MEMS) Scanning functions Multi-parametric analysis

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Simulation of Multi-Channel Microlens Array for Image Stitching 19

Simulation of Multi-Channel Microlens Array for Image Stitch...

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19th Conference on current developments in Lens design and optical engineering

作者： Chao, Chien Su, Guo-Dung Natl Taiwan Univ Grad Inst Photon & Optoelect 1 Roosevelt RdSect 4 Taipei Taiwan

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

In this study, we propose a new micro-optical system with 1.65 zoom ratio for image stitching. The new system with four layers is based on microlenses and liquid lens arrays. In order to realize the zoom function, we design the first and the fourth layers by the liquid lens and we also set up the second and the third layers as the fixed lens to tilt the optical axes. The length of the system is 6.4 mm, the image size 8.6 x 6.6 mm(2), the field of view (FOV) 50 degrees in wide mode and the field of view 28 degrees in tele mode. The MTF and distortion are used to demonstrate the zoom function, the stitching function and the stitching with zoom function, respectively. We use the ZEMAX ray-tracing software to demonstrate the simulation of image stitching in wide and tele modes.

关键词： Image system Micro-optics optical design Array Zoom system Liquid lens system

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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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design of an adaptive Fresnel lens using design thinking methodology and cost analysis 19

Design of an adaptive Fresnel lens using design thinking met...

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19th Conference on current developments in Lens design and optical engineering

作者： Santiago Alvarado, Agustin Cruz Felix, Angel S. Santiago Gomez, Stephanie L. Ruiz Zavala, Soledad Osorio Garcia, Adelita Iturbide Jimenez, Fernando Univ Tecnol Mixteca Carretera Acatlima Km 2-5 Huajuapan De Leon 69000 Oaxaca Mexico

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The main characteristic of adaptive lenses is to change their shape, and consequently their focal length, by modifying their physical parameters. On the other hand, Fresnel lenses have such features as large aperture, short focal length, they are slim and reduced in size. These kind of lenses have become very popular due to their applications, such as in compound eyes, optical communication systems, photolithography, imaging systems, etc. Nowadays, several kinds of tunable lenses exist such as those made with dielectric materials, lenses that change their focal length by varying the refractive index of the material, liquid lenses composed by elastic membranes and solid elastic lenses. In this work, we present the design, simulation of the mechanical behavior using Finite Element Method (FEM) and cost analysis of an Adaptive Fresnel Lens made of an elastic material, together with a mechanical mounting system. Our study considered the use of design thinking methodology to obtain the best optical design at minimal cost. Analysis, results and future applications are presented.

关键词： Adaptive Fresnel lens design Thinking optical design

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design of lens hoods for the "Lira-B" space telescope 19

Design of lens hoods for the "Lira-B" space telescope

引用

19th Conference on current developments in Lens design and optical engineering

作者： Muratov, Artem Olyunin, Vyacheslav Bacholdin, Alexey Voznesenskaya, Anna ITMO Univ 49 Kronverksky Av St Petersburg 197101 Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The space investigation project "Lira-B" is purposed to perform a high-precision multicolor photometric all-sky survey of objects from 3 to 16 m. This investigation concludes in multiple photometric measurements in ten spectral bands from 200 to 1000 nm. Such telescope systems should provide maximum light gathering and meet stray light requirements. The main goal of the given work is optical design of the telescope system with lens hoods protecting against the parasitic illumination. Analysis of impact of the lens hoods' surface structure and coatings on the image quality is performed and ways to reduce the stray light in the system. The modeling is carried out using Zemax OpticStudio software in the non-sequential mode.

关键词： Lira-B Zemax lens hood telescopic system

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The design of the Prism Film on the optical Concentrator for Photovoltaic Applications 19

The Design of the Prism Film on the Optical Concentrator for...

引用

19th Conference on current developments in Lens design and optical engineering

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

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

As an application of the PV technology, building integrated photovoltaic (BIPV) technologies have attracted an increasing interest in the past decade. One of these BIPV elements is the luminescent solar concentrators (LSCs). The LSC consists of a transparent plate embedded with luminescent dyes or inorganic particles, and the solar cells are attached on one or more sides. The incoming sunlight absorbed by the luminescent dyes or inorganic particles re-emits at a longer wavelength, and part of the re-emitting light trapped in the transparent plate reaches the PV cell attached on the LSC and convert it to electricity. However, the efficiency of the LSCs is still low at this stage. The surface loss on the top surface of the transparent plate is one of the main losses in LSCs. The prism film in liquid-crystal display (LCD) module is used to collimate the light in the module and enhance the overall brightness, and would be used in the LSCs to enhance the incoming sunlight to the solar cells attached on the end of the transparent plate. Then the design of the prism film is important. In this study, the ray-tracing simulation is used to investigate the optical characteristics of the LSC with the prism film covered on the top surface of the transparent plate. Different structure of the prism film will be considered to enhance the light reaches the PV cell attached on the LSC.

关键词： Prism film optical design optical Concentrator

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