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2x192 Pixel CMOS SPAD-Based Flash LiDAR sensor with Adjustable Background Rejection 25

2x192 Pixel CMOS SPAD-Based Flash LiDAR Sensor with Adjustab...

25th IEEE International conference on Electronics, Circuits and systems (ICECS) / IEEE Asia Pacific conference of Circuits and systems (APCCAS)

作者： Beer, Maik Thattil, Charles Haase, Jan F. Brockherde, Werner Kokozinski, Rainer Fraunhofer Inst Microelect Circuits & Syst IMS Finkenstr 61 D-47057 Duisburg Germany Univ Duisburg Essen Dept Elect Components & Circuits Bismarkstr 81 D-47057 Duisburg Germany

ISBN: (纸本)9781538695623

In this paper we present a 2x192 pixel SPAD-based sensor for LiDAR applications fabricated in a 0.35 ttm standard CMOS process. Distance measurement is performed using the direct time-of-flight technique. For time acquisition a DLL-based pixel-parallel TDC with 312.5 ps resolution and a 1.28 ttm range is integrated. Employing four single SPADs in each pixel enables background light suppression by detecting temporal correlated photons. Moreover, by using adjustable correlation parameters the dynamic range is increased significantly allowing a constant range at varying target reflectivity.

关键词： photon coincidence single-photon avalanche diode (SPAD) time-of-flight (T01) range imaging light detection and ranging (LIDAR)

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Hand-held MEMS hyperspectral imager for VNIR mobile applications 17

Hand-held MEMS hyperspectral imager for VNIR mobile applicat...

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conference on MOEMS and Miniaturized systems xVII

作者： Nasila, Antti Trops, Roberts Stuns, Ingmar Havia, Tahvo Saari, Heikki Guo, Bin Ojanen, Harri J. Akujarvi, Altti Rissanen, Anna VTT Tech Res Ctr Finland Espoo Finland

ISBN: (数字)9781510615762

ISBN: (纸本)9781510615762

This paper presents a novel miniaturized hand-held hyperspectral imager for VNIR range of lambda = 600 - 900 nm based on MEMS Fabry-Perot interferometer (MFPI) technology. In recent years, tunable MFPI optical filters have been utilized to demonstrate sensors for mobile applications, including CO2 smartphone sensor for mid infra-red region and hyperspectral iPhone for visible spectrum. This hand-held sensor module targets the VNIR range in order to enable food sensing, while utilizing low-cost camera technology to enable potential volume scalability for future sensing applications. The sensor module is wirelessly connected to a mobile device, which enables further application algorithms development and cloud-based solutions.

关键词： Fabry-Perot interferometer hyperspectral imager MOEMS VNIR smartphone spectroscopy

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Industrial Environment Mapping Using Distributed Static 3D sensor Nodes 14

Industrial Environment Mapping Using Distributed Static 3D S...

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14th IEEE/ASME International conference on Mechatronic and Embedded systems and applications (MESA)

作者： Aalerud, Atle Dybedal, Joacim Ujkani, Erind Hovland, Geir Univ Agder Dept Engn Sci Mechatron Grp Agder Norway

ISBN: (纸本)9781538646434

This paper presents a system architecture for mapping and real-time monitoring of a relatively large industrial robotic environment of size 10m x 15m x 5 m. Six sensor nodes with embedded computing power and local processing of the 3D point clouds are placed close to the ceiling. The system architecture and data processing is based on the Robot Operating System (ROS) and the Point Cloud Library (PCL). The 3D sensors used are the Microsoft Kinect for xbox One and point cloud data is collected at 20 Hz. A new manual calibration procedure is developed using reflective planes. The specified range of the used sensor is 0.8m to 4.2 m, while depth data up to 9m is used in this paper. Despite the fact that only six sensors are used and that the Kinect sensors are operated beyond the specified range, a benchmark of the accuracy compared with a Leica laser distance meter demonstrates an accuracy of 10mm or better in the final 3D point cloud.

关键词： Robot sensing systems Three-dimensional displays Cameras Meters Service robots Calibration"

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Enhancing Resource Availability in Vehicular Fog Computing Through Smart Inter-Domain Handover

Enhancing Resource Availability in Vehicular Fog Computing T...

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GLOBECOM 2020 - 2020 IEEE Global Communications conference

作者： Vitor Barbosa Souza Moises Henrique Pereira Levi H. S. Lelis xavi Masip-Bruin Universidade Federal de Viçosa (UFV) Viçosa-MG Brazil Pontifícia Universidade Católica (PUC-Rio) Rio de Janeiro Brazil University of Alberta Edmonton Canada Advanced Network Architectures Lab (CRAAX) Universitat Politècnica de Catalunya (UPC) Barcelona Spain

ISBN: (数字)9781728182988

ISBN: (纸本)9781728182995

In recent years, computer network architectures are experiencing a significant shift motivated by a myriad of edge devices generating a tremendous volume of data, service providers deploying real-time and huge bandwidth-consuming network applications, and mobile end-users demanding stringent quality of service and reduced service disruption. The fog computing architecture aims at addressing several related issues by employing computing resources at the edge of the network. However, frequent and even unexpected handover among distinct fog domains is yet a research challenge because it hinders the continuous availability of shared edge resources. In this work, we employ reinforcement learning (RL) to learn from experience how to maximize the availability of resources at fog domains by minimizing the handover frequency in vehicular scenarios through smart resource placement. We evaluated our RL-based model in simulations mimicking real-world scenarios where each moving vehicle may connect to different fog domains throughout its route. The results show that the proposed model yields an improvement in the availability of resources in comparison to a greedy strategy under all simulated scenarios.

关键词： Handover Edge computing Reinforcement learning Computer architecture Task analysis Real-time systems Quality of service

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FBG strain sensor mounted on plastic carrier 15

FBG strain sensor mounted on plastic carrier

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conference on Fiber Optic sensors and applications xV

作者： Fajkus, Marcel Nedoma, Jan Mec, Pavel Jargus, Jan Svobodova, Lucie Skapa, Jan Martinek, Radek Vasinek, Vladimir VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Telecommun Ostrava Czech Republic VSB Tech Univ Ostrava Fac Civil Engn Dept Bldg Mat & Diagnost Struct Ostrava Czech Republic VSB Tech Univ Ostrava Fac Civil Engn Dept Architecture Ostrava Czech Republic VSB Tech Univ Ostrava Fac Elect Engn & Comp Sci Dept Cybernet & Biomed Engn Ostrava Czech Republic

ISBN: (数字)9781510618206

ISBN: (纸本)9781510618206

Fiber optic Bragg gratings are among the most widely used fiber optic sensors. It uses in dangerous explosive environments thanks to the electrical passivity of the sensor itself, but also in applications with high electromagnetic disturbance. Maintaining immunity of the sensor to electromagnetic interference requires non-electrical encapsulation material. This paper describes the encapsulation of the FBG sensor on a plastic plate fixed by gluing to the monitored structure. The proposed FBG sensor is suitable for measuring deformations or vibrations of iron and concrete structures. Due to the material used, the FBG sensor keeps resistance to electromagnetic interference, humidity, and corrosion. The results show the almost equal sensitivity of FBG strain sensors mounted on a metal carrier when measuring very small deformations and vibrations. The proposed FBG sensor concept reduces the cost of its manufacturing by using a 3D printer to produce the plastic carrier.

关键词： Bragg grating encapsulation 3D printer short-gauge strain sensor

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Optical fibers applied to aerospace systems prognostics: design and development of new FBG-based vibration sensors

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IOP conference Series: Materials Science and Engineering 2021年第1期1024卷

作者： G Quattrocchi P C Berri M D L Vedova Dalla P Maggiore Department of Mechanics and Aerospace Politécnico di Torino Turin 10129 Italy

Future generation actuation systems will be characterized by ever-increasing complexity. In this context, it will be necessary to adopt advanced health monitoring strategies to guarantee a high level of operational safety and system reliability. Prognostics and Health Management (PHM) is thus emerging as an enabling discipline for the design and operation of future advanced, complex systems. Smart systems with embedded self-monitoring capabilities are nowadays required in order to provide early faults identification and to perform innovative diagnostic and prognostic functions. In aerospace applications, the use of smart sensors could replace various types of traditional sensing elements, commonly used in structural monitoring with the additional capability of performing some prognostics or diagnostics tasks. This work proposes the first results of an experimental campaign aimed at evaluating and validating various packaging solutions for vibration amplification and detection using optical sensors (Fiber Bragg Gratings, FBGs), since characteristics frequencies can be good prognostics indicators of particular failure modes of a system. Several test samples were created by using 3D printed PLA and compared using a variety of bench tests. Results were compared in order to identify the strengths and weaknesses of the various proposed configurations, and were validated by comparing them with numerical simulations and experimental measurements performed with traditional sensors such as strain gages and accelerometers.

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Hole Detection in Wireless sensor Network: A Review 5th

Hole Detection in Wireless Sensor Network: A Review

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5th International conference on advanced Computing, Networking, and Informatics (ICACNI)

作者： Das, Smita DebBarma, Mrinal Kanti NIT Agartala Dept Comp Sci & Engn Agartala 799046 India

ISBN: (纸本)9789811086366;9789811086359

Nowadays wireless sensor networks (WSNs) have massive relevance from environmental observation to endangered species recovery, habitat monitoring to home automation, waste management to wine production, medical science to military applications. While organizing the sensor nodes in a WSN, covering the area-to-be-monitored is a tricky job and this quality is compromised in the presence of holes. Hole may be defined as an area in WSN around which a sensor is incapable of sensing or transmitting data. As holes can cause permanent or temporary interruption in sensing or in communicating task, therefore detection of holes in a coverage area is an essential job. In this paper, a detail literature review is done on hole detection, categorization, characteristics, and their effect on sensor network's performance on the basis of the most recent literature.

关键词： Wireless sensor networks sensor nodes Coverage Hole detection Hole healing Boundary detection

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CMOS Image sensor Data-Readout Method for Convolutional Operations with Processing Near sensor Architecture 14

CMOS Image Sensor Data-Readout Method for Convolutional Oper...

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14th IEEE Asia Pacific conference on Circuits and systems (APCCAS)

作者： Zhu, Huifeng Wei, Qi Qiao, Fei Yang, Yi Liu, xinjun xu, Shuzheng Yang, Huazhong Tsinghua Univ Dept Elect Engn Beijing Peoples R China Tsinghua Univ Dept Mech Engn Beijing Peoples R China

ISBN: (纸本)9781538682401

In this paper, we propose a CMOS image sensor data-readout method for convolutional operations based on 3T-APS pixel, which is able to output convolutional kernel-sized data from sensor parts simultaneously, with processing near sensor architecture. By adding extra output lines in the pixel array and introducing a digital controlled analog crossbar named programmable analog tunnel hub (PATH), the proposed CIS can realize maximum 5x5 kernel-readout with minimum 1 slide step. The proposed CIS readout method has been verified by pixel array with 32x32 resolution, where each pixel occupying 40x40 mu m(2) area with 83.6% fill factor. The CIS is designed in 180nm standard CMOS mixed-signal process with power consumption of 5.66mW and frame rate of 100fps@20MHz. Compared with previous vision sensor chips, this work is optimized for prevailing deep learning applications and achieves higher energy efficiency for the whole smart perception systems with better scalability.

关键词： CMOS Image sensors Deep Learning Accelerator Convolutional Operations Processing Near sensor

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advanced industrial laser systems and applications 7

Advanced industrial laser systems and applications

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conference on High-Power Laser Materials Processing - applications, Diagnostics, and systems VII

作者： Schmidt, B. Schaefer, M. TRUMPF Photon Inc 2601 US Route 130 Sout Princeton NJ 08512 USA TRUMPF Lasertech GmbH Johann Maus Str 2 D-71254 Ditzingen Germany

ISBN: (数字)9781510615366

ISBN: (纸本)9781510615366

Industrial laser systems continue to evolve in terms of power levels, brightness and mode of operation. While continous-wave (cw) laser systems drive to more efficiency, compactness and robustness, ultra-short pulse (USP) solid-state lasers (SSL) gain increasing attention from industry due to their higher average power levels, increasing pulse energies and more flexible repetition rates, eventually enabling increased productivity and novel materials processing applications. TRUPMF's laser systems portfolio starting in 1985 mirrors this general development and is therefore an interesting subject to reflect the path of industrial laser systems from early CO2 lasers to the latest generation of diode pumped nanosecond-pulsed disk lasers with up to 400W of average output power at 343nm. Today, our advanced laser families enable novel applications such as EUV light generation, laser lift-off and surface annealing.

关键词： Disk laser fiber laser diode laser ultra-short pulsed laser welding cutting annealing

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Fluorescence lifetime assisted enhanced security feature in travel documents for border control and security applications 3

Fluorescence lifetime assisted enhanced security feature in ...

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conference on Counterterrorism, Crime Fighting, Forensics, and Surveillance Technologies III

作者： Johny, Jincy Officer, Simon Fung, Wai Keung Prabhu, Radhakrishna Robert Gordon Univ Sch Engn Aberdeen Scotland Robert Gordon Univ Sch Pharm & Life Sci Aberdeen Scotland

ISBN: (数字)9781510630369

ISBN: (纸本)9781510630369

Border management and security challenges are increasing considerably in recent years. One of the major concerns is counterfeiting and fraudulent use of identity and other travel documents for crossing border controls. This poses serious threats and safety concerns worldwide, considering the scenario of terrorism and illegal migration across the world. Hence, advanced technologies with improved security features becomes essential to strengthen border security and to enable smooth transits. In this paper, we present a novel dual waveguide based invisible fluorescence security feature with lifetime discrimination and a simple validation system. Molecular fluorescence and lifetimes from the rare earth doped waveguides can be used as additional security features in the identity documents. The validation system consists of a modulated excitation source and fast photo-diodes which helps in the simultaneous detection of multiple security features from the fluorescence waveguides. The rare earth doped fluorescence waveguides are embedded into the identity document as micro-threads or tags which are invisible to the naked eye and are only machine readable. Rare earth fluorescence materials have higher sensitivity and selectivity as they absorb only specific ultraviolet (UV) or visible (VIS) wavelengths to create corresponding fluorescent emissions in the visible or infrared wavelengths. Herein, we present the results based on the fluorescence and fluorescence lifetime spectroscopic studies carried out on the terbium (Tb) and dysprosium (Dy) doped waveguides. The different emission wavelengths and lifetimes of these rare earth elements is a key differentiating feature, providing selectivity and security to the detector systems.

关键词： Fluorescence Lifetime Rare earth Waveguide Spectroscopy Security feature Border control Anti-counterfeiting

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