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5th Asian School-conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2020

作者： Dostovalov, Alexandr V. Wolf, Alexey A. Bronnikov, Kirill A. Skvortsov, Mikhail I. Churin, Alexey E. Babin, Sergey A. Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave Novosibirsk630090 Russia

ISBN: (纸本)9783035737936

In this paper we investigate the fiber Bragg grating (FBG) arrays selectively inscribed in a multicore fiber for a different sensor and laser applications. Particularly, wavelength-switchable and tunable fiber laser was realized based on uniform and non-uniform FBGs precisely positioned in the selected cores. A quasi-distributed 3D shape sensor based on FBG array inscribed in a multicore fiber with helically twisted side cores was fabricated and applied for shape reconstruction of papillotome. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Fiber lasers

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Unveiling Mechanical Stress in Lithium-Metal Batteries for Flexible Electronics: A Novel Approach with Optical Techniques and Artificial Interfaces

Unveiling Mechanical Stress in Lithium-Metal Batteries for F...

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Electronic Components and Technology conference (ECTC)

作者： Mayukh Nandy Siyang Liu Todd Houghton Haiwei Wu Candace Chan Hongbin Yu Arizona State University Tempe AZ USA

ISBN: (数字)9798350375985

ISBN: (纸本)9798350375992

The widespread use of electronics has created a growing demand for high-energy-density Lithium-metal batteries in recent times. This demand has significantly increased as more wearable devices are being designed for applications like soft robotics, health monitoring, and movement tracking, all of which require flexible batteries. The longevity of these batteries relies on their ability to repeatedly bend and flex without damage. One crucial concern is the internal mechanical stress on electrodes caused by lithiation. Dendrite formation during lithium plating not only heightens this stress but also raises safety issues and reduces battery capacity. One solution is to deposit an artificial solid electrolyte interphase on the current collector before lithiation, ensuring a dendrite-free Li layer. This paper introduces novel optical reliability methods using camera and laser to gauge the mechanical stress on flexible electrodes. These methods are simpler and more efficient, allowing for stress measurement using a camera instead of relying on complex systems like the multibeam optical stress sensor (MOSS). Within a transparent electrochemical cell, we use Cu-coated polyethylene terephthalate (PET) as the working electrode and a Li metal sheet as the reference. The electrolyte comprises a solution of lithium hexafluorophosphate in ethylene carbonate and diethyl carbonate (1.0 M LiPF6 in EC/DEC=50/50 v/v). Due to its lower Young’s modulus, PET is the chosen substrate, making it highly sensitive to stress. The in-situ observation of the bending angle during lithiation under varied charge and discharge cycles provides insights into stress development.

关键词： Electrodes Plating Optical imaging Cameras Batteries Dendrites (neurons) Optical sensors

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Quasi-monolithic laser system based on 3D-printed optomechanics 7

Quasi-monolithic laser system based on 3D-printed optomechan...

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conference on Components and Packaging for Laser Systems VII

作者： Kranert, Fabian Budde, Jana Hinkelmann, Moritz Wienke, Andreas Neumann, Joerg Kracht, Dietmar Lachmayer, Roland Laser Zentrum Hannover eV Hollerithallee 8 D-30419 Hannover Germany Cluster Excellence PhoenixD Photon Opt & Engn Inn Hannover Germany Inst Prod Tentwicklung & Geratebau Univ 1 D-30823 Garbsen Germany

ISBN: (数字)9781510641709

ISBN: (纸本)9781510641709

An advantage of using additive manufacturing (AM) processes as opposed to conventional fabrication methods is that the additional degrees of freedom in design allow compact and at the same time lightweight components to be manufactured. In addition, AM reduces the material consumption, resulting in a more cost efficient production. Among others, the field of laser development benefits from the progressive implementation of AM-related opportunities. However, this integration is mostly limited to single components. In contrast, we present a compact, lightweight solid-state laser oscillator system for low-power applications based on additively manufactured optomechanical components via Fused Filament Fabrication (FFF). The laser system is based on a Nd:YVO4-crystal pumped externally with a fiber-coupled laser diode at a wavelength of 808nm and a maximum output power of 3 W. The commercial optical components, such as lenses and the crystal, are firmly embedded via FFF in quasi-monolithic optomechanics. Thereby, they are fixed at their position and thus secured against misalignment. Furthermore, sensor technology for temperature monitoring is implemented into the structure. The possibility of the FFF process to work with different materials in parallel is used here. This multi-material printing approach enables the use of the appropriate polymer for the individual mechanical and thermal requirements for any structural part. The thermal stability of the printed structures is evaluated to ensure damage-free operation of the 3D-printed polymer optomechanics. Furthermore, output power, optical-to-optical efficiency, beam pointing, and spatial beam profile of the laser system are measured for several on- and off-switching cycles as well as for long-term operation.

关键词： 3D-printed optomechanics solid-state laser system packaging and mounting of optical components additive manufacturing compact and lightweight optomechanics

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Neutron Detection Module Based on Li-Glass Scintillator and Array of SiPMs

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IEEE TRANSACTIONS ON NUCLEAR SCIENCE 2020年第4期67卷 599-602页

作者： Wengrowicz, Udi Osovitzky, Alon Ocherashvili, Aaron Volasky, Eli Ifergan, Yahir Kadmon, Yagil Raveh, Avi Orion, Itzhak Nucl Res Ctr Negev NRCN IL-84190 Beer Sheva Israel Ben Gurion Univ Negev Nucl Engn Unit IL-84105 Beer Sheva Israel Rotem Ind Ltd Radiat Detect Div Rotem Ind Pk IL-8680600 Mishor Yamin Dn Arava Israel

This article presents a model setup of neutron sensors consisting of a Li-glass scintillator coupled with a silicon photomultiplier (SiPM) array. The newest developments based on SiPMs array enable high-gain and the low-light detection capabilities of the traditional photomultiplier tube (PMT) while offering the benefits of a solid-state sensor: low-voltage operation, insensitivity to magnetic fields, reduced dimensions, and mechanical robustness. Measurements conducted with the presented setup were complemented with the Monte Carlo N-Particle Transport Code (MCNP) numerical simulations for larger systems. The results indicate the feasibility of utilizing the presented technology for highly sensitive handheld neutron radiation detectors in compliance with the requirements of IEC 62534 standards.

关键词： Monte Carlo N-Particle Transport Code (MCNP) neutron detection numerical simulations radiation detectors scintillation counters silicon photomultiplier (SiPM) arrays

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19.1 Optical Phased-Array FMCW LiDAR with On-Chip Calibration

19.1 Optical Phased-Array FMCW LiDAR with On-Chip Calibratio...

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IEEE International conference on solid-state Circuits (ISSCC)

作者： SungWon Chung Makoto Nakai Samer Idres Yongwei Ni Hossein Hashemi University of Southern California Los Angeles CA

ISBN: (数字)9781728195490

ISBN: (纸本)9781728195506

Light detection and ranging (lidar) sensors provide high resolution and high accuracy for diverse applications such as autonomous vehicles and three-dimensional imagers. Over the past few years, there has been significant development towards compact, low-power, and low-cost realization of lidars. Recently, silicon-based large-scale optical phased arrays operating at around 1550nm [1 -4] along with their application in lidar [5] [6] have been demonstrated. A major challenge associated with large-scale optical phased arrays is the inevitable mismatches across the array that necessitate array calibration. At present, all large-scale arrays are calibrated by using an external optical detector for measuring focused far-field beam spot intensity [3] or infrared image sensors for measuring the far-field radiation patterns in the lab [1] [2] [6]. This solution, which requires an external detector at a far-field distance, naturally does not lend itself to large-scale field deployment of optical phased arrays for commercial applications with a compact form factor.

关键词： Phased arrays Laser radar Optical detectors Optical variables measurement Optical imaging Calibration Optical arrays

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Investigation of bowing effect of 4’’ epitaxial wafer and reliability of gan-based micro-led devices

Investigation of bowing effect of 4’’ epitaxial wafer and ...

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International conference on Display Technology, ICDT 2020

作者： Zhang, Ke Liu, Yibo Sun, Xiaowei Liu, Zhaojun Kwok, Hoi-Sing State Key Laboratory of Advanced Displays and Optoelectronics Technologies the Hong Kong University of Science and Technology Hong Kong Department of Electrical and Electronic Engineering Southern University of Science and Technology China

GaN-based Micro-LEDs have shown great potential in various filed, such as solid-state lighting, display, sensor, visible light communication and multifunctional devices. The performance of Micro-LEDs in various operating environment drew enormous attention recently. We investigate the fabrication process of Micro-LED devices with 4’’ epitaxial wafer. The problems occurred during the process, especially bowing effect, were systematically introduced. Several solutions have been proposed and compared. In addition, the characterization and reliability test were measured to show sufficient quality of those devices. © 2021, John Wiley and Sons Inc. All rights reserved.

关键词： Light emitting diodes

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EffiE: Efficient Convolutional Neural Network for Real-Time EMG Pattern Recognition System on Edge Devices

EffiE: Efficient Convolutional Neural Network for Real-Time ...

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International IEEE/EMBS conference on Neural Engineering, CNE

作者： Jimmy Lu Philip Liang Jin Chul Rhim Xiaorong Zhang Zhuwei Qin Lowell High School San Francisco CA School of Engineering San Francisco State University San Francisco CA

With the advancement of deep learning (DL) technologies, applying DL methods to processing surface electromyo-graphic (sEMG) signals for movement intent recognition has gained increasing interest in the research community. Compared to conventional non-DL methods commonly used for EMG pattern recognition (PR), DL algorithms have the advantage of automatically extracting sEMG features without the cumbersome manual feature engineering step and are especially effective in processing sEMG signals collected from 1-dimentional (1D) or 2D sensor arrays. However, a key challenge to the deployment of DL methods in sEMG-controlled neural-machine interface (NMI) applications (e.g., myoelectric controlled prostheses) is the high computational cost associated with DL algorithms (e.g., convolutional neural network (CNN)) since most NMI applications need to be implemented on resource-constrained embedded computer systems and have real-time requirements. In this paper, we designed and implemented EffiE - an efficient CNN for real-time EMG PR system on edge devices. The development of the EffiE system integrated several strategies including a deep transfer learning strategy to adaptively and quickly update the pre-trained CNN model based on the user's newly collected data on the edge device, and a deep learning quantization method that can dramatically reduce the memory consumption and computational load of the CNN model without sacrificing the model accuracy. The proposed EffiE system has been implemented on a Sony Spresense 6-core microcontroller board as a working prototype for real-time NMIs. The embedded NMI prototype has integrated input/output interfaces as well as efficient memory management and precise timing control schemes to achieve real-time DL-based myoelectric control of a bionic arm using hand gestures. We released all the source code at: https://***/MIC-Laboratory/EffiE

关键词： Deep learning Adaptation models Computational modeling Transfer learning Feature extraction Real-time systems Electromyography

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Investigation of volumetric three-dimensional display technologies

Investigation of volumetric three-dimensional display techno...

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International conference on Display Technology, ICDT 2020

作者： Yan, Gewei Li, Jiayi Zhao, Chenxi Lu, Zengxiang Liu, Zhaojun Department of Electric and Electronic Engineering Southern University of Science and Technology Shenzhen China Faith Billion Technology Development Co. Ltd. Hong Kong

The three-dimensional display is an important future land for the display industry. To reach a three-dimensional display, several methods have been improved. For volumetric three-dimensional display, due to a physical three-dimensional display volume, the three-dimensional image can provide an all-around viewing without wearing any equipment. This article reviews several volumetric display methods using solid-state volumetric display technology, free-space volumetric technology, swept volume display technology combined with light field display technology. We discuss the benefits of using various display mediums and structure for a good performance in different situations. © 2021, John Wiley and Sons Inc. All rights reserved.

关键词： Three dimensional displays

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Robot-Assisted Backscatter Localization for IoT applications

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2020年第9期19卷 5807-5818页

作者： Zhang, Shengkai Wang, Wei Tang, Sheyang Jin, Shi Jiang, Tao Huazhong Univ Sci & Technol Sch Elect Informat & Commun Wuhan 430074 Peoples R China Southeast Univ Sch Informat Sci & Engn Nanjing 211189 Peoples R China

Recent years have witnessed the rapid proliferation of backscatter technologies that realize the ubiquitous and long-term connectivity to empower smart cities and smart homes. Localizing such backscatter tags is crucial for IoT-based smart applications. However, current backscatter localization systems require prior knowledge of the site, either a map or landmarks with known positions, which is laborious for deployment. To empower universal localization service, this paper presents Rover, an indoor localization system that localizes multiple backscatter tags without any start-up cost using a robot equipped with inertial sensors. Rover runs in a joint optimization framework, fusing measurements from backscattered WiFi signals and inertial sensors to simultaneously estimate the locations of both the robot and the connected tags. Our design addresses practical issues including interference among multiple tags, real-time processing, as well as the data marginalization problem in dealing with degenerated motions. We prototype Rover using off-the-shelf WiFi chips and customized backscatter tags. Our experiments show that Rover achieves localization accuracies of 39.3 cm for the robot and 74.6 cm for the tags.

关键词： Wireless fidelity Backscatter Interference Robot sensing systems Receivers Antenna arrays Backscatter localization inertial sensor channel state information

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Towards Drift Modeling of Graphene-Based Gas sensors Using Stochastic Simulation Techniques

Towards Drift Modeling of Graphene-Based Gas Sensors Using S...

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IEEE sensors conference

作者： Schober, Sebastian A. Carbonelli, Cecilia Roth, Alexandra Zoepfl, Alexander Wille, Robert Infineon Technol AG Munich Germany Infineon Technol AG Regensburg Germany Johannes Kepler Univ Linz Inst Integrated Circuits Linz Austria Software Competence Ctr Hagenberg GmbH SCCH Hagenberg Austria

ISBN: (纸本)9781728168012

Due to environmental conditions as well as internal processes, the lack of long-term stability of electrochemical gas sensors poses a severe problem with respect to their applications, e.g. in tracking air quality on a large scale. Thus far, the development of suitable algorithms to face these problems relies on long-term datasets obtained from sufficiently good reference devices. Since such measurements on actual sensor systems are not always available, especially in the development phase of them, simulated approaches would be a great benefit for algorithm development and the further analysis of the sensors. Those simulators, however, require proper models to capture the general principles of the functionalized materials in such sensor arrays. In this work, we propose a stochastic model that can be used for this purpose, i.e. that allows for simulating the behavior of graphene-based electrochemical gas sensors in particular. The proposed approach allows to properly map different material-related microscopic effects on the sensor surface to a signal output. Evaluations show that the proposed model is able to capture the drift dynamics of such sensors in particular when comparing the results to real measurement data.

关键词： stochastic modeling electrochemical sensors gas sensors e-nose adsorption processes sensor simulation

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