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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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Compact infrared imaging lidar system for obstacle detection and mapping in sensor fusion

Compact infrared imaging lidar system for obstacle detection...

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Unconventional Imaging and Adaptive Optics 2021

作者： Kim, Sehyeon Chen, Zhaowei Alisafaee, Hossein Department of Physics and Optical Engineering Rose-Hulman Institute of Technology 5500 Wabash Avenue Terre HauteIN47803 United States

ISBN: (数字)9781510645110

ISBN: (纸本)9781510645103

Lidar is an optical technology for detection and range measurements, which has been attracting much attention in developments of next generation driving and navigation. Herein, we report on development of a type of non-scanning, non-solid-state, laser-based infrared lidar system with the potential applications in advanced driver assistance systems and autonomous vehicles. Our emphasize in the design approach has been on compactness of the final system in order for it to be deployable both as standalone or complimentary to existing lidar sensors, enabling fusion sensing in automotive or even in drone applications. The non-scanning lidar system, currently patent pending, is comprised of a laser light source, a plurality of optical elements to create a predefined reference optical pattern, means for filtering returned optical signals, imaging optics, an optical detector, and a processing unit. The principle of this system is largely based on image processing with a known and calibrated reference. Using Python and OpenCV, the near infrared images acquired from the entire field of view is analyzed in real-time to determine the position and velocity of the objects. The work presented here describes the principle of our new lidar system, the optical system design, as well as the experimental results demonstrating its performance. The benefits and limitations of the imaging lidar technology developed by us are compared to those of the current scanning and flash lidars. © 2021 SPIE.

关键词： optical radar

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Graphene-Coated Microring Resonator (MRR)-based Gas Sensor using Novel Intensity-Level Detection for low-cost, rapid, and label-free Sensing: Preliminary Simulated Results

Graphene-Coated Microring Resonator (MRR)-based Gas Sensor u...

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URSI Atlantic Radio Science Conference (URSI AT-RASC)

作者： Kent C. Soria Benjamin B. Dingel Jezlor Villarde Ramon C. Lapina Cindy Lisa Esporlas Luther Villacruz Kryss Urbano Francesca Palabrica Clint Dominic Bennett Department of Physics School of Science and Engineering Ateneo de Manila University Quezon City Philippines Nasfine Photonics Inc. Painted Post NY USA

ISBN: (数字)9789463968102

ISBN: (纸本)9798350360257

Almost all current microring resonator (MRR) based sensors rely on a wavelength shift detection scheme. This involves (i) expensive tunable lasers as an input source and (ii) optical spectrum analyzers as a detector, which leads to overall bulky configuration, high cost, and complex arrangement. Here, we propose a low-cost, tapered waveguide MRR-based gas sensor that uses a simple intensity-level detection method. It employs (1) a low-cost laser source and (2) a photodetector. The MRR is coated with graphene to detect the specific target element. This design can significantly reduce the overall cost and complexity of the sensing system.

关键词： Costs Graphene optical device fabrication optical resonators Waveguide lasers Photodetectors Safety

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optical Instrument Science, Technology, and Applications ii

Optical Instrument Science, Technology, and Applications II

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optical Instrument Science, Technology, and Applications ii 2021

ISBN: (纸本)9781510645967

The proceedings contain 15 papers. The topics discussed include: optical system with a curved detector for wide-field high-resolution cortical imaging at meso-scale;compensation of the position errors of optical elements by adapting their additively manufactured mounting structure;optical design applied to an effective inactivation of airborne pathogens;calibration of the complete jones matrix of SLMs;current status of PAPYRUS : the pyramid based adaptive optics system at LAM/OHP;an UV spectrograph for the LAPSUS project;virtual prototyping of BSDF measurements for materials with complex scattering properties;and inline process refractometer based on image defocusing.

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Using optical diagnostics for near field blast testing 8th

Using optical diagnostics for near field blast testing

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8th International Conference on Structural engineering, Mechanics and Computation (SEMC)

作者： Langdon, G. S. Curry, R. J. Rigby, S. E. Pickering, E. G. Clarke, S. D. Tyas, A. Gabriel, S. Yuen, S. Chung Kim von Klemperer, C. J. Univ Sheffield Dept Civil & Struct Engn Sheffield S Yorkshire England Univ Cape Town BISRU Dept Mech Engn Rondebosch South Africa Univ Cape Town Dept Mech Engn Rondebosch South Africa

ISBN: (纸本)9781003348443

The ability to measure the structural and material response to air-blast loading is vital to developing a proper understanding of near-field blast loading and response. Computational modelling has advanced significantly but, until recently, experimental techniques lagged behind. This paper discusses recent advances in these experimental techniques. The first part describes a bilateral test programme between the UK and South Africa. The high-speed imaging and digital image correlation system at Cape Town gives repeatable and accurate impulse distributions across a central strip of a panel, useful for model validation. Flexural wave behaviour was observed from the transient velocity and displacement profiles, giving good insights into the mechanics of plate response from blast loads. The second part demonstrates the value of high-speed stereo-imaging for measuring the transient response of blast loaded fibre reinforced polymer panels and sandwich structures. The peak displacements. elastic rebounds and transient oscillations provide valuable insights into the damage propagation within these types of structures. The final part of the paper describes some of the continued developments since the success of those early trials, resulting in a new optical diagnostics for blast capability at the University of Sheffield. The imaging system operates at higher frame rates and can cover a wider region of interest on the structure. Ultra-high speed imaging is also shown to be a useful tool for visualising detonations fronts in explosive charges and the expanding fireball.

关键词： Fiber reinforced plastics

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Highly uniform and efficient, broadband meta-beam-splitter/combiner

arXiv

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arXiv 2023年

作者： Hemayat, Saeed Hsu, Liyi Ha, Jeongho Ndao, Abdoulaye Department of Electrical and Computer Engineering Photonics Center Boston University 8 Saint Mary's Street BostonMA02215 United States

Subwavelength planar structured interfaces, also known as metasurfaces, are ultra-thin optical elements modulating the amplitude, phase, and polarization of incident light using nanostructures called meta-atoms. The optical properties of such metasurfaces can be controlled across wavelengths by selecting geometries and materials of the meta-atoms. Given recent technological developments in optical device miniaturization, components for beam splitting and beam combining are sought for use within these devices as two quintessential components of every optical setup. However, realizing such devices using metasurfaces typically leads to poor uniformity of diffraction orders and narrow-band operation. Using a modified version of particle swarm optimization, we propose and numerically demonstrate a broadband, reciprocal metasurface beam combiner/splitter with uniformity>97% and diffraction efficiency>90% in the continuous band from λ=1525 nm to λ=1575 nm. The proposed approach significantly extends the current state of the art of metasurfaces design in terms of uniformity, bandwidth, and efficiency, and opens the door for devices requiring high power or near-unit uniformity. Copyright © 2023, The Authors. All rights reserved.

关键词： Incident light

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Prediction of incompetent rock mass based on characteristic parameters and neural network 4

Prediction of incompetent rock mass based on characteristic ...

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4th International Conference on Artificial Intelligence and Electromechanical Automation, AIEA 2023

作者： Gong, Xiqiao Zhang, Yunpei Liu, Lipeng Liu, Qing Liu, Qi Wang, Shuangjing Yunnan Dianzhong Water Diversion Engineering Co. Ltd Kunming650000 China Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing100038 China Changjiang Survey Planning Design and Research Co. Ltd Wuhan430010 China China Railway Engineering Equipment Group Co. Ltd Zhengzhou450016 China

ISBN: (纸本)9781510666412

TBM is famous for its safety and efficiency of tunnel boring, but TBM is also easy to encounter geological disasters in incompetent rock mass with its poor geological adaptability. Unfortunately, due to the shelter from cutterhead and shield, it’s hard to diagnose and identify the quality of rock mass. Based on this, this paper uses the torque penetration index TPI to predict incompetent rock mass, the main steps can be summarized as follows: firstly, we use linear fitting to calculate TPI, secondly, build the prediction model respectively with ii-iiI grade of surrounding rocks and IV-V grade of surrounding rocks based on neural network, thirdly, predict the current TPI by the TPI of last boring cycles, finally, calculate the predicted torque based on the penetration and predicted TPI, then the incompetent rock mass is quickly identified through the error analysis between actual torque and predicted torque. © 2023 SPIE.

关键词： Forecasting

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NSGA-ii algorithm-based optimization model for matching supply and demand of energy-using right products 2

NSGA-II algorithm-based optimization model for matching supp...

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2nd International Conference on Energy, Power, and Electrical Technology, ICEPET 2023

作者： Liu, Rui Zhang, Zhiqiang Wang, Yueping Zhang, Zheyu Yang, Hao State Grid Energy Research Institute CO.Ltd Beijing102209 China State Grid Gansu Electric Power Company Lanzhou730050 China School of Economics and Management North China Electric Power University Beijing102206 China

ISBN: (纸本)9781510668270

In recent years, China's new power system has been connected to large-scale uncontrollable new energy sources, and its unstable power output and the increasing power load year by year have led to a more severe power supply and demand situation during peak hours. To meet the peak load demand, we design an energy-use right product for peak hours, which aggregates the power generation resources not included in the electricity market and the idle demand-side resources, and design a dual-objective supply-demand matching optimization model for the supply side. In this paper, we simulate the spot market trading of energy-use rights products in the current electricity trading spot market context. The results show that the model can balance the benefits of the energy supply side and the transaction scale of energy-use rights products, attracting unused energy supply side resources to participate in the market to bring into play the vitality of peak regulation while trading all idle resources as much as possible, to alleviate the tension of electricity consumption during peak hours to the greatest extent. © 2023 SPIE.

关键词： Multiobjective optimization

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Study on planar junction infrared detectors based on InAs/GaSb type-ii superlattices

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optical and Quantum Electronics 2025年第6期57卷 1-14页

作者： Wang, Zhifang Zhou, Yi Huang, Min Xu, Zhicheng Liao, Kecai Liang, Zhaoming Sun, Cheng Chen, Yijie Chen, Jianxin University of Shanghai for Science and Technology Shanghai200433 China Shanghai Institute of Technical Physics Shanghai200083 China School of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

InAs/GaSb type-ii superlattice infrared detectors, with their advantages of tunable bandgap and high material uniformity, have become a preferred material for mid-infrared imaging detectors. Conventional superlattice infrared photodetectors predominantly employ mesa architectures. In contrast, planar junction configurations offer higher fill factors at reduced pixel dimensions while mitigating etch-induced leakage currents, rendering them promising alternatives. Nevertheless, research on such structures remains scarce in the literature. This study presents Si-implanted planar junction photodetectors based on InAs/GaSb type-ii superlattices, achieved through optimised device design, fabrication, and systematic characterisation. X-ray diffraction (XRD) measurements indicate that the overall crystalline quality of the material remains intact mainly following post-implantation annealing, and spectral measurements verify the mid-wavelength infrared (MWIR, 3–5 μm) photoresponse. Performance tests further showed that the dark current of the device is related to the area of the implantation window, which decreases as the implantation window area increases. Subsequently, the LBIC laser-induced detection system was used to characterise the optical response distribution of the InAs/GaSb superlattice planar junction device at 77 K and to fit the signal decay curve outside the junction region. The findings indicate that the photosensitive region expanded by 5.4 ± 0.16 μm after implantation, demonstrating the presence of lateral carrier diffusion in the superlattice material. The results of this study show the feasibility of the planar junction design of the mid-infrared focal plane array. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.

关键词： Infrared devices

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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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