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design of Bifocal Metalens with Extended Depth of Focus

Design of Bifocal Metalens with Extended Depth of Focus

引用

2023 International conference on Optoelectronic Information and Functional Materials, OIFM 2023

作者： Ma, Yaqi Wu, Fei Xu, Yishen Ye, Yan School of Optoelectronics Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215006 China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province Key Lab of Modern Optical Technologies of Education Ministry of China Soochow University Suzhou215006 China

ISBN: (纸本)9781510668119

The extended depth of focus (DOF) of optical systems can improve the longitudinal range of imaging. Although it is possible to achieve a stable extension of the focal depth by using the traditional Inverse Quartic Axicon (IQAX) with the Seidel spherical aberration, its large volume and bulky structure prevent its application in small integrated optical systems. In contrast, a metasurface, with a small volume, thin thickness, and flexible control of light waves, provides a wider range of applications as extended DOF lenses. We have here developed a bifocal metalens with a polarization-dependent extended DOF. By combining the Pancharatnam – Berry phase with the spatial multiplexing method, the incident left circularly polarized light and right circularly polarized light were then focused on different transverse positions. The here-designed bifocal metasurface lens, with its extended DOF, can be applied in areas like multi-channel information encryption, optical imaging and detection. © 2023 SPIE.

关键词： Lenses

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A novel microwave landing radar system design 2

A novel microwave landing radar system design

引用

2nd International conference on Electronic Information engineering, Big Data, and Computer Technology, EIBDCT 2023

作者： He, Yapeng Zhang, Aijun Dang, Hongxing Tan, Xiaomin Academy of Space Information Systems Xi'An710100 China

ISBN: (纸本)9781510664968

Millimeter wave landing radar is one of the important payloads of deep space landing probes, providing the landing probe with its distance and velocity information relative to the landing surface in the landing descent process to ensure landing accuracy and safety, and the landers of Chinese Chang'e Lunar Exploration Project and Mars Exploration Project are all equipped with millimeter wave landing radar. In this paper, a novel microwave landing radar with hybrid pulsedoppler and continuous wave work mode is presented. Analog and digital circuit integration technology with characteristics of light weight and small size is utilized to miniaturize the subsystems design. This novel design can be applied to the follow-up project applications such as Chang'e Lunar Exploration Projects and manned lunar exploration. © 2023 SPIE.

关键词： Millimeter waves

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Multi-Objective Optimization Strategy of Microgrid Based on Cooperative Operation of optical Storage in Industrial Park

Multi-Objective Optimization Strategy of Microgrid Based on ...

引用

2025 International conference on Electrical Automation and Artificial Intelligence, ICEAAI 2025

作者： Jin, Long Zhang, Yanchi School of Electrical Engineering Shanghai DianJi University Shanghai China

ISBN: (纸本)9798331506797

With the continuous development of photovoltaic power generation and energy storage technology, microgrid systems in industrial parks have gradually become an important means to achieve efficient use of green energy. Aiming at the energy demand of industrial parks, this paper proposes a multi-objective optimization strategy based on the cooperative operation of photovoltaic power generation and energy storage. By analyzing the fluctuation of photovoltaic power generation and the charge-discharge characteristics of the energy storage system, a multi-objective optimization model which can achieve energy balance and maximize economic benefits under different working conditions is constructed. Optimization objectives cover many aspects such as maximizing photovoltaic utilization, minimizing energy storage costs, matching load demand and reducing environmental pollution. In order to solve the multi-objective optimization problem, the non-dominated sorting genetic algorithm (NSGA-ii) was used to solve the optimization model, and the actual data of the industrial park was simulated and verified. The results show that the optimization strategy can effectively improve the photovoltaic consumption rate, reduce the operating cost of the system, and ensure the stable operation of important loads, which provides a new technical solution for energy management in industrial parks. © 2025 IEEE.

关键词： Light storage collaboration Microgrid multi-objective optimization NSGA-ii algorithm power Industrial Park

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Free-form surface reconstruction of off-axis three mirror optical system based on Rhino

Free-form surface reconstruction of off-axis three mirror op...

引用

2022 conference on Infrared, Millimeter, Terahertz Waves and Applications, IMT 2022

作者： Chang, Lingying Chen, Kui Zhao, Yuhang Qiu, Yuehong Wang, Guanru Wang, Xinyou Xi'an University of Post and Telecommunications Xi’an710121 China Xi’an Institute Optics and Precision Mechanics Chinese Academy of Sciences Xi’an710119 China

ISBN: (纸本)9781510662476

With the development of modern space optical system, off-axis reflective system with wide spectrum, high resolution and large field of view has become the main direction of optical design. However, the off-axis property of off-axis reflective structure brings asymmetric aberration, which makes designers use free-form surface frequently to correct the aberration of optical system and improve the imaging quality. When the Trace Pro optical mechanical simulation software cannot accurately convert the optical system with free-form surface in CODE V, it is difficult to simulation stray light and analysis environmental in the subsequent studies. The reconstruction of free-form surface of off-axis three mirror optical systems are realized by Rhino in this paper. For the free-form surface in the off-axis three mirror optical systems designed by CODE V, a uniform circular dot ring array sampling method based on polar coordinates is proposed to obtain the free-form surface point cloud data. The point deviation of 5mm-80mm was analyzed, and the optimal sampling interval for the point cloud data of XY polynomial free-form surface with an aperture of 150mm was determined to be 10mm;The NURBS method is used to reconstruct the free-form surface model in Rhino, and the free-form surface reconstruction of the off-axis three mirror optical system is modeled in Trace Pro. Through the simulation of imaging optical path and the analysis of image point dispersion spot radius, it is verified that the free-form surface model of off-axis three mirror optical system can be reconstructed based on rhino. This research provides an effective method reference for optical mechanical joint simulation analysis. © 2023 SPIE.

关键词： optical systems

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design and Simulation of a MEMS Based Surface Profilometer 50

Design and Simulation of a MEMS Based Surface Profilometer

引用

50th Annual conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Senarathna, T.D.S.S. Kariyawasam, S.A. Amarasinghe, Y.W.R. Jayathilaka, W.A.D.M. Department of Mechanical Engineering University of Moratuwa Katubedda Sri Lanka

ISBN: (纸本)9781665464543

With the rapid advancement of the Micro Electro Mechanical systems (MEMS) field necessitates a focus on associated surface analysis and manipulation techniques. Existing methods, such as Atomic Force Microscopy, and optical Interferometry, present an effective but complex approach to surface profiling. These methods often involve intricate calibration processes, and require sophisticated equipment, thereby limiting their usage. To address these challenges, this paper introduces a novel MEMS based capacitive profilometer that offers an easy accessible, and efficient solution for surface roughness measurement, while integrating surface manipulation capabilities. This proposed system is simple, compact, and highly versatile. It is capable of measuring surface roughness in the range ±10 µm, making it suitable for a wide range of applications. The sensing, and actuation mechanisms are governed by the principle of capacitance. This paper provides a detailed design analysis, simulation results, and fabrication procedure for successful implementation. © 2024 IEEE.

关键词： Surface analysis

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LQG controller design for seismometer based on differential capacitance detection principle

LQG controller design for seismometer based on differential ...

引用

2024 International conference on Automation Control, Algorithm, and Intelligent Bionics, ACAIB 2024

作者： Huang, Kai Ren, Haoran Zhang, Zhongkun Explosion and Seismic Sensing Research Center Institute of Advanced Technology Zhejiang University Zhejiang Hangzhou310000 China College of Biomedical Engineering and Instrument Science Zhejiang University Zhejiang Hangzhou310000 China

ISBN: (纸本)9781510682597

The frequency range of seismic waves typically extends from 0.01Hz to 100Hz, and in most cases, the signals are faint, making them susceptible to noise interference. To minimize noise interference and extract faint seismic signals, this paper proposes a method utilizing a second-order oscillating structure seismometer, employing differential capacitance detection and dual-carrier modulation-demodulation to measure tiny displacements of inertial components. In response to the shortcomings of the open-loop structure of the seismometer and the system limitations inherent in capacitance detection principles, a Linear Quadratic Gaussian (LQG) controller is designed to achieve feedback control of the system. Comparative experiments with open-loop systems, as well as those employing PID and LQR controllers, demonstrate that LQG not only improves the dynamic performance of the system but also effectively suppresses external noise. This research provides insights into the design of seismometer detection circuits and feedback controllers. © 2024 SPIE.

关键词： Seismographs

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Noise Mitigation Based on Geometric Shaping of 32QAM for Discrete Spectrum Nonlinear Frequency Division Multiplexing systems

Noise Mitigation Based on Geometric Shaping of 32QAM for Dis...

引用

2024 Asia Communications and Photonics conference, ACP 2024 and International conference on Information Photonics and optical Communications, IPOC 2024

作者： Tang, Xue Liu, Bo Ren, Jianxin Mao, Yaya Wu, Xiangyu Song, Xiumin Chen, Shuaidong Ullah, Rahat Institute of Optics and Electronics Nanjing University of Information Science & Technology China Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean China Jiangsu International Joint Laboratory on Meteorological Photonics and Optoelectronic Detection Nanjing China Beijing University of Posts and Telecommunications Beijing China School of communication and information engineering Nanjing University of Posts and Telecommunications Nanjing China

A noise mitigation scheme is proposed for nonlinear frequency division multiplexing systems. This scheme utilizes channel characteristics to design an olive shape geometry with greater ASE noise and phase noise tolera... 详细信息

ISBN: (纸本)9798350379266

关键词： Geometry

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Optimization of autonomous operation of energy-consuming parks considering economy-energy-efficiency-carbon emission coupling 10

Optimization of autonomous operation of energy-consuming par...

引用

10th International conference on Energy Materials and Electrical engineering, ICEMEE 2024

作者： Zhang, Qingzhi Zhou, Litian Wang, Meng Liu, Ge Pei, Jianjun Bu, Lingxi Comprehensive Energy Planning and Design Institute Co. Beijing China

ISBN: (纸本)9781510686243

With the intensification of the global energy crisis and environmental pressure, the optimization of energy systems in high energy-consumption parks has become particularly critical. This paper proposes an integrated energy system (IES) operation optimization strategy for high-energy-consumption parks that comprehensively considers economy, energy efficiency and carbon emission. By constructing a multi-objective optimization model, it achieves efficient energy utilization and cost reduction while reducing environmental pollution. The study establishes the IES model, analyzes the energy equipment coupling relationship, and optimizes the energy conversion strategy. Example analyses verify the effectiveness of the strategies in improving operational efficiency and promoting green development. © 2024 SPIE.

关键词： Solar energy Carbon Wind energy Energy efficiency Mining Mathematical optimization Turbines Photovoltaics Wind turbine technology Power grids

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Comparative Analysis of Deep Learning Architectures for Multilingual Digit Recognition 2

Comparative Analysis of Deep Learning Architectures for Mult...

引用

2nd IEEE International conference on Data Science and Network Security, ICDSNS 2024

作者： Mamatha Bai, B.G. Sarangi, Akruti Kashyap, Akanksha Yadav, Himanshi Nitte Meenakshi Institute of Technology Department of Computer Science & Engineering Bangalore India

ISBN: (纸本)9798350373110

Digit recognition is foundational in pattern recog-nition and machine learning, with applications in document processing and optical character recognition. Current research often targets English digits, overlooking language-independent systems. This paper bridges this gap by analyzing deep-learning architectures and activation functions for Hindi, English, and Kannada digits. We evaluate CNN, LeNet, ResNet, MobileNet, and Inception (GoogleNet) models, and activation functions like sigmoid, tanh, linear, ELU, Leaky ReLU, and ReLU. The results indicate ResNet achieves 99.498% accuracy in English, 99.43% in Hindi, and 97.67% in Kannada datasets. This study enhances the design and optimization of robust digit recognition systems across diverse languages and scripts, promoting efficient models for practical applications. Despite advancements with CNNs, research predominantly focuses on English digits, highlighting the need for lanauage-independent recognition systems. © 2024 IEEE.

关键词： Convolutional neural networks

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Hydrodynamic analysis and design of mooring system for an aquaculture fish cage

Hydrodynamic analysis and design of mooring system for an aq...

引用

2022 International conference on Mechatronics engineering and Artificial Intelligence, MEAI 2022

作者： Wang, Hongfu Xiang, Xu Lan, Gongying Pang, Fuzhen Marine Design and Research Institute of China Shanghai200011 China College of Shipbuilding Engineering Harbin Engineering University Harbin150001 China

ISBN: (纸本)9781510663169

In order to study the hydrodynamic performance of an aquaculture fish cage, the hydrodynamic model of the cage was established based on the potential flow theory and Morrison equation, and the motion response amplitude operator (RAO) of the cage was analyzed. Based on the quasi-static method, the full chain and three-segment mooring systems are designed respectively. The motion response of the cage under the combined action of wind, wave, and current was calculated and the two mooring schemes were compared. This study shows that the three-segment mooring scheme can effectively reduce the maximum tension of the mooring line and reduce the weight of the mooring line under 50-year extreme environmental loads. © 2023 SPIE.

关键词： Aquaculture

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