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5th conference on New Advances in Condensed Matter Physics, NACMP 2018

ISBN: (纸本)9783035713275

The proceedings contain 17 papers. The topics discussed include: a new model of projectile motion for resistance proportional to square of velocity components;first-principles study of electronic structure, optical properties and LO-TO splitting of gap;first-principle study of effect of strain on the band structure of germanane monolayer;temperature dependence of commensurate magnetic resonance in cuprate superconductors;v-defect and dislocation analysis in InGaN multiple quantum wells on patterned sapphire substrate;the effect of compression force on alteration of desloratadine and its multicomponent crystal crystallinities using X-ray diffraction and ATR-FTIR techniques;input interface for all spin logic;proposal and demonstration of GaN-based normally-off vertical field-effect transistor with a design of back current block layer;the unique property in magnetic noise of spin modulated atomic magnetometer;and influence of the thickness of nonmagnetic spacer on the magnetic properties of Fe/Cu multilayered nanowires.

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

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

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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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A CMOS MAGFET-Based Programmable Isolation Amplifier

A CMOS MAGFET-Based Programmable Isolation Amplifier

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： Seyed Sepehr Mirfakhraei Yves Audet Ahmad Hassan Mohamed Ali Morteza Nabavi Mohamad Sawan Polystim Neurotech Lab. Polytechnique Montréal Montréal Canada CenBRAIN School of Engineering Westlake University and Westlake Institute of Advanced Sciences Hangzhou Zhejiang China

ISBN: (数字)9781728170442

ISBN: (纸本)9781728170459

In this paper, we present a high common mode voltage amplifier with a novel isolation technique. In this proposed structure, a minimum of 430 v isolation is satisfied from on-chip intermetal SiO 2 layers. On the high-voltage side, an adjustable gain amplifier that supports ±2.5 v of differential voltage drives the coil. However, on the low-voltage side, a CMOS integrated magnetic field sensitive MOSFET (MAGFET) placed under the coil converts the generated magnetic field into a current imbalance which will be transformed to a differential voltage via a cascode stage. In addition, based on the ADC input dynamic range, the signal amplitude is adjusted by using a 6-bit dB-linear programmable gain amplifier (PGA) with a gain range of 0 to 54 dB and a maximum gain-nonlinearity error of 0.2 dB. This PGA has a temperature independent characteristic with a maximum gain error of 0.21 dB over a temperature variation between -40 to 80 °C. The design achieves a low input offset of 0.18 mv. It has also a low current consumption of 1.2 and 2.3 mA for the high voltage and the low voltage side, respectively.

关键词： Gain Electronics packaging Magnetic fields Sensors Clocks Choppers (circuits) optical transmitters

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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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Optimizing Coating Thickness of Electrophoretic Deposition Overlay on Plasma Sprayed YSZ Coating Using Taguchi Method

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IOP conference Series: Earth and Environmental Science 2022年第1期961卷

作者： Ruqayah A. Abbas Sami A. Ajeel Maryam A. Ali Bash Mohammed J. Kadhim Department of Production Engineering and Metallurgy University of Technology Baghdad 10066 Iraq

In this study, nano sized yttria stabilized zirconia (YSZ) suspension in organic solution was deposited by electrophoretic deposition (EPD) method as a protective layer on substrate that was previously plasma sprayed thermal barrier coating (TBCs). In order to improve the performance of TBC from degradation by melt ingression of fuel impurities. design of experiments (DOE) by Taguchi method was used to optimize the controlled variables of EPD process. A crack free YSZ overlay coating was carried out at different variables; applied voltage (20, 40, 60) v, deposition time (3, 5, 7) min and suspension concentration (5, 10, 15) g/l using DC current. Morphological appearance and cross section of the investigated coating specimen were done using optical and field emission scanning electron microscope. Optimizing process and analysis of variances (ANOvA) were performed by 'Minitab 18' software. The results indicate that best condition of coating thickness can be obtained at 40v, 5min and 10g/l when applying signal-to-noise ratio 'Larger is better'.

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design of ergonomic handpieces for a CO₂ laser system for surgical and cosmetological applications 19

Design of ergonomic handpieces for a CO<sub>2</sub> laser sy...

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

作者： Zavatskaia, Kseniia voznesenskaya, Anna ITMO Univ Dept Appl & Comp Opt St Petersburg Russia

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

The CO2 laser systems are widely used for different specialised surgery types and cosmetological procedures. The market is filled with various offers regarding the systems, however, every manufacturer supplies a very limited range of handpieces with the equipment. Thus, the work of surgeon or a medical worker is complicated by the discrepancy of a handpiece with the ergonomic/ technical requirements for a specific procedure. It may result in negative consequences of the procedure itself or a choice not in favor of laser technologies. The work presents the design of optical system and construction of specialised handpieces for CO2 laser system based on the discussion with medical workers of several hospitals that directly interact with the equipment and the technical requirements of medical procedures.

关键词： CO2 laser handpiece laser surgery optical design

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Field-of-view enhancement for commercially available active imaging camera using time-of-flight technology 19

Field-of-view enhancement for commercially available active ...

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

作者： Poulin-Girard, Anne-Sophie Smith, Michael Gagnon, Mathieu Legault, Marc-Antoine Thibault, Simon Univ Laval Ctr Opt Photon & Lasers 2375 Rue Terrasse Quebec City PQ G1V 0A6 Canada Innovat Vehicle Inst 25 Boul Maisonneuve St Jerome PQ J5L 0A1 Canada

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

Active imaging techniques have been, and will remain relevant as an integral part of the sensor network needed in mobile robotics navigation, most commonly with the use of LiDARs. For close range applications, time-of-flight (TOF) cameras are an alternative to more expensive LiDARs. The Kinect v2 (Kinect for XboxOne) has been used frequently as a range imaging camera in machine vision research because of its low cost and good performance. For mobile robotics applications moving at low speed, a larger field of view than the original (70 degrees X 60 degrees) would be desirable to increase awareness of the surroundings, and also detect other moving objects in the trajectory. Our main goal is therefore to increase the Kinect v2 field of view while keeping its main feature of depth measurements. A simple but effective solution consists in using a conversion lens to increase the ray collection angle before the rays enter the IR camera. Depth measurements remain possible from each pixel using TOF with the Kinect v2 modulated signal, provided the field of illumination matches the field of view. A trade-off has to be made between accuracy of depth measurement, optical performance and field of view/illumination enhancement. Therefore, we modified a Kinect v2 to characterize its optical performances and evaluate its relevancy for applications requiring accurate knowledge of the 3D surroundings. A field of view improvement of the Kinect v2 and other similar TOF cameras could offer an alternative at minimal cost for depth measurements in machine vision, specifically in mobile robotics research where object detection and mapping tasks are frequently carried out.

关键词： Active imaging optical system mobile robotics depth camera range imaging time of flight wide angle machine vision

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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...

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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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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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