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检索条件"任意字段=Conference on Advanced Optical Manufacturing and Testing Technology 2000"

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Design of large field of view diffractive lens based on quadratic phase profile 4

Design of large field of view diffractive lens based on quad...

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4th International conference on Laser, Optics, and Optoelectronic technology, LOPET 2024

作者： Liu, Tianyu Xu, Feng 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)9781510681903

In this paper, combined with the idea of phase optimization and computational imaging, an optimization design method of diffraction microstructure of large field of view diffractive lens is studied. The off-axis aberration of the diffractive lens is regulated, and the back-end image restoration algorithm is combined to finally achieve a large field of view and high-quality imaging effect. Based on the quadratic phase profile, the microstructure height of the diffractive lens is numerically optimized. A quadratic phase diffractive lens with an aperture of 500 μm and a focal length of 500 μm is designed, fabricated and experimentally verified. Finally, it is proved that this method can achieve 60°(±30°) large field of view diffraction imaging effect. © 2024 SPIE.

关键词： Diffraction Diffractive optical elements Image processing Light sources Mathematical optimization optical testing Phase distribution Point spread functions

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Rapid Prototyping of a Micro-Scale Spectroscopic System by Two-Photon Direct Laser Writing 1

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SEM Annual conference and Exposition on Experimental and Applied Mechanics

作者： Salerni, Anthony Furlong, Cosme Worcester Polytech Inst Ctr Holog Studies & Laser MicromechaTron CHSLT Worcester MA 01609 USA Worcester Polytech Inst Chem & Biochem Dept Worcester MA 01609 USA Worcester Polytech Inst Mech Engn Dept Worcester MA 01609 USA

ISBN: (数字)9783031504747

ISBN: (纸本)9783031504761;9783031504747;9783031504730

The development of two-photon 3D lithographic technologies has enabled the fabrication of 3D optics at sub-micron resolution. The freedom allotted by this technology allows for the fabrication of miniaturized complex optical components, such as freeform micro-optics and diffractive optical elements. Additionally, the ability to rapidly prototype these micro-optical components facilitates the development of custom-tailored optical systems for specialized applications. The goal of this work is the construction of a prototype micro-optical system that enables quantitative absorbance spectroscopy for use in the visible and near infrared (VIS/NIR) regions. Employing a combination of optical design software and two-photon direct laser writing (TP-DLW) we seek to demonstrate functionalization of an optical fiber with a miniaturized spectrophotometer, integrable with mobile devices. The methods used to produce this miniaturized optical system facilitates functionalization of chip-on-tip technology, as a low-cost approach for realization of integrated spectrophotometers in applications from quality assurance in the food and drug industries, to spectral tissue sensing in medicine. Presented in this work are the representative results of the performance and integrability of a prototyped micro-spectrophotometer probe at the tip of an optical fiber.

关键词： Miniaturization Nondestructive testing (NDT) Spectroscopy Two-photon direct laser writing

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Super-elastic liquid-metal-based triboelectric fibers and textiles

Super-elastic liquid-metal-based triboelectric fibers and te...

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2023 advanced Fiber Laser conference, AFL 2023

作者： Pan, Shengli He, Huiyu Xin, Litao Li, Biao Wu, Xin Wang, Pu Beijing Engineering Research Center of Laser Technology Beijing University of Technology Beijing100124 China Key Laboratory of Trans-scale Laser Manufacturing Technology Beijing University of Technology Beijing100124 China Institute of Laser Engineering Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China

ISBN: (纸本)9781510677661

Flexible and wearable fiber-based triboelectric nanogenerators (FTENGs) have gained much attention in the wearable field due to their ability to convert waste mechanical energy from human motion into electrical energy. However, due to the limitation of preparation technology, FTENG still has the problems of poor flexibility and low electrical output performance. Herein, we prepared super-elastic microstructure triboelectric fibers (SMTFs) by using an extrusion combined with the thermal drawing process. The thermoplastic elastomer was drawn as the cladding, and filled with liquid metal EGaIn as the conductive electrode. The SMTFs show a superior stretchability (1900 % strain), and excellent conductivity. Utilizing a 5 cm long fiber to contact with PMMA medium, the average open circuit voltage was up to 10 V. Moreover, the SMTFs have a stable electrical output performance over 2000 s. The SMTFs were further woven into 8×8 cm2 textiles for energy harvesting. The maximum electrical outputs were 150 V, 10 μA, and 33 nC, respectively. Our results indicate that the SMTFs fabricated by extrusion method combined with the thermal drawing process have the potential in wearable energy devices, intelligent textiles, and human-machine interaction. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Energy harvesting

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Implementation Scheme and Research of IoT Electronic "intelligent manufacturing" Based on MES System 3

Implementation Scheme and Research of IoT Electronic "intell...

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3rd International conference on Mechanical, Electronics, and Electrical and Automation Control, METMS 2023

作者： Zhou, Jinjing Hangzhou Zhiyuan Electronics Co Ltd. China

ISBN: (纸本)9781510666689

Recent years, the "Made in China 2025" strategy, the National "14th Five-Year Plan", the "14th Five-Year Plan for the Construction of Zhejiang Global advanced manufacturing Base", etc. have pointed out from the national and local levels to promote the digital transformation of China's manufacturing industry, build future factories, realize Intelligent manufacturing Industry 4.0 to become a manufacturing power. [4] Based on this background, this paper expounds the implementation scheme of IoT Electronic "Intelligent manufacturing" Factory based on MES technology combined with Flexible Lean Production technology, Automatic Identification technology, Automatic testing and Assembly technology, and Digital Information technology through the intelligent manufacturing case of Hangzhou Zhiyuan Electronics Co., Ltd. The solution organically integrates ERP system, MES system, PCS system, etc., and forms an intelligent manufacturing scheme that integrates data information flows such as decision-making, execution, control adjustment, etc., through which the overall production quality and manufacturing efficiency of electronic products are improved. Besides, the flexibility is increased and the manufacturing cycle is also significantly shortened. It provides a successful exploration of theory and practice for the implementation and promotion of multi-variety, small-batch electronic intelligent manufacturing based on MES system and IoT technology. © 2023 SPIE. All rights reserved.

关键词： Internet of things

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The dynamic performance of the spindle in ultra-precision machine tools under different drive systems 8

The dynamic performance of the spindle in ultra-precision ma...

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8th Asia Pacific conference on Optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on advanced optical manufacturing, YSAOM 2023

作者： Wu, Hailiang Yang, Hui Lu, Chaowei Zhang, Yang Aviation Key Laboratory of Science and Technology on Precision Manufacturing Technology Beijing Precision Engineering Institute for Aircraft Industry Beijing100076 China

ISBN: (纸本)9781510672673

In order to analyze the influence of servo drives on the dynamic performance of multi-Axis coordinated ultra-precision machine tools, this study employs Simulink modeling and simulation of the control system for a domestic ultra-precision machine tool with gas-static spindle, followed by conducting position control experiments. The dynamic response of the spindle under different drives in ultra-precision machine tools is modeled based on the dynamic characteristic equation of the spindle motor. Waveforms of current, torque, and speed response of the spindle motor under different drives are simulated and analyzed. Control laws between the controlled object and the drive system are derived from the analysis of simulation data. Based on this, a dynamic performance testing platform for the spindle in ultra-precision machine tools is established, with the repeatability of positioning accuracy as the dynamic performance parameter. The linear correlation analysis between the experimental data of repeatability of positioning accuracy and the simulation results is conducted to quantitatively evaluate their correlation. Finally, it is determined that the gas-static spindle under the control of a linear amplifier exhibits the best dynamic performance. Moreover, as the PWM frequency increases under the control of PWM-Type drives at 100 kHz, 50 kHz, and 16 kHz, the dynamic performance of the spindle also improves. This study provides reference for the selection of drives in the design and selection stage of control systems for ultra-precision machine tools. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Machine tools

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Reference surface self-calibration stitching algorithm based on Legendre polynomials for testing synchrotron radiation flat mirrors 8

Reference surface self-calibration stitching algorithm based...

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8th Asia Pacific conference on Optics Manufacture, APCOM 2023 and 3rd International Forum of Young Scientists on advanced optical manufacturing, YSAOM 2023

作者： Liu, Yong Gao, Xibo Hu, Zubo Xue, Shuai Chen, Shanyong Huang, Cheng Du, Chunyang Hu, Hao Dai, Yifan Peng, Xiaoqiang Wang, Linfeng College of Intelligence Science and Technology National University of Defense Technology Changsha Hunan410073 China Hunan Key Laboratory of Ultra-Precision Machining Technology Changsha Hunan410073 China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense Technology Changsha Hunan410073 China State Key of High Performance Complex Manufacturing Central South University Changsha Hunan410073 China

ISBN: (纸本)9781510672673

X-ray mirrors play a critical role in transmitting and focusing beams in advanced light source devices like synchrotron radiation (SR) and free electron laser (FEL) light sources. The Root-Mean-Square (RMS) value of surface shape accuracy required for these mirrors is typically sub-micro radian/sub-nanometer, and their aperture can be hundreds of millimeters or even meters. To achieve this accuracy, deterministic figuring is required and surface figure error is the premise. Interferometric stitching test is commonly utilized. However, interferometric test obtains the surface figure error relative to the reference surface. To obtain the absolute surface figure error of X-ray mirrors, it is crucial to obtain the surface figure error of the reference surface before or during stitching measurement and separate it from the stitching result. To achieve this, a reference surface self-calibration interferometric stitching algorithm based on Legendre polynomial fitting is reported. The algorithm fits the reference surface by orthogonal Legendre polynomials in the rectangular domain, and the polynomial coefficients are expressed as interlocking terms in the stitching algorithm. The fitting coefficients are optimized and fitted together with the free compensation terms, i. *** translation and tilt terms. The paper established the theoretical model of the algorithm and conducted simulations on an X-ray mirror with a length of 300 mm. A two dimensional stitching interferometry device was built. An X-ray mirror with a length of 300 mm was tested utilizing the proposed method. The short-Term repeatability was preliminarily analyzed. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Synchrotron radiation

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REAL-TIME PRINT TRACKING IN METAL ADDITIVE manufacturing USING ACOUSTIC EMISSION SENSORS AND VISION TRANSFORMER ALGORITHMS 19

REAL-TIME PRINT TRACKING IN METAL ADDITIVE MANUFACTURING USI...

引用

ASME 2024 19th International manufacturing Science and Engineering conference, MSEC 2024

作者： Akhavan, Javid Xu, Ke Krishna, Chaitanya Vallabh, Prasad Manoochehri, Souran Department of Mechanical Engineering Stevens Institute of Technology HobokenNJ United States

ISBN: (纸本)9780791888117

Directed Energy Deposition (DED) is an additive manufacturing (AM) method with applications in the aerospace, automotive, and healthcare sectors. In such complex and high-stakes applications, accurate and reliable monitoring is indispensable for assuring fabrication quality. Conventional monitoring systems using mechanical encoders and optical devices have limitations such as wear susceptibility and line-of-sight issues respectively, thereby necessitating alternative monitoring systems. One crucial aspect often overlooked in conventional monitoring systems is the real-time printing process tracking. Achieving high accuracy in tracking is paramount for identifying and mitigating defects in real-time, ultimately leading to improvements in fabrication quality. To address this problem, this research employs acoustic emission sensors for real-time monitoring in Laser DED. These sensors augment existing monitoring methods to improve both reliability and part quality. We developed and tested two machine learning models to study acoustic data correlation with the print process tracking. The first model, based on a Hybrid Convolutional Auto Encoder (HCAE), achieved over 94% accuracy in the print head spatial localization. The second, a Transformer-based model, excelled with a 98.5% accuracy rate and computational efficiency in process tracking. Our findings promise enhanced printing process tracking and pave the way for advanced AI algorithms incorporation into AM quality monitoring. The AI-enabled methods developed can be generalized to other manufacturing applications such as Laser Powder Bed Fusion. Copyright © 2024 by ASME.

关键词： Acoustic emission testing

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Dynamic comfort analysis on longitudinal intelligent driving system

Dynamic comfort analysis on longitudinal intelligent driving...

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2022 International conference on advanced manufacturing technology and manufacturing Systems, ICAMTMS 2022

作者： Feng, Jiacheng Liu, Weiguo Yangjun Yong, Cheng Zhan, Haiting Zheng, Weiling Testing Technology Co. Ltd Beijing China Testing Technology Co. Ltd China Research Institute Co. Ltd Beijing China Testing Technology Co. Ltd Beijing China Testing Technology Co. Ltd Beijing China

ISBN: (纸本)9781510656840

Currently the carrying rate of advanced driver-assistance system (henceforth called ADSA) in vehicles reached 30% and the utilization rate is increasing. For production vehicle, comfort and psychological acceptance of automatic driving system are important for user experience and the prevention of motion sickness. This paper presents a methodology and evaluation algorithm for control quality analysis of ADSA. Through the analysis of longitudinal acceleration and jerk in time domain and non-time domain, multi-dimensional results based on test scenario are obtained. Form the result, we can quantitatively analyse the bad working condition and calibration tendency of the system. The purpose of the paper is to (1) presents an evaluation method of intelligent driving comfort, (2) provide a data processing and evaluation algorithm for road test and simulation test, (3) carry out a real vehicle test to verify the algorithm and analysis the difference of productions by benchmarking test. © 2022 SPIE.

关键词： Autonomous vehicles

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Study on the aging diagnosis of oil-paper insulation based on ultrasonic time-frequency characteristics 4

Study on the aging diagnosis of oil-paper insulation based o...

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4th International conference on Mechanical, Electronics, and Electrical and Automation Control, METMS 2024

作者： Wang, Qing Qian, Yihua Zhao, Yaohong Yang, Dingkun Yang, Zhuang Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou510080 China School of Advanced Manufacturing Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China School of Electrical Engineering Chongqing University Chongqing400044 China

ISBN: (数字)9781510679887

ISBN: (纸本)9781510679870

Timely and effective identification of transformer aging is of great importance to the safety and stability of the power system. In this paper, a method for diagnosing the aging of oil-paper insulation based on ultrasonic time-frequency characteristics is proposed. First, the prepared aged oil samples were subjected to ultrasonic testing. Then, the Pearson correlation coefficient method was used to screen 8 ultrasonic features that were strongly correlated with the aging of oil-paper insulation. Finally, a transformer aging diagnostic model is established based on the above features and combined with radial basis function neural network. The results show that the diagnostic accuracy of the model proposed in this paper exceeds 90%. The method proposed in this paper has the potential of on-line evaluation of aging state of transformer. © 2024 SPIE.

关键词： Ultrasonic testing

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Low cycle fatigue behavior and failure mechanism of 34CrNiMo6 steel used as connecting rod for diesel engine 11

Low cycle fatigue behavior and failure mechanism of 34CrNiMo...

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2024 11th International conference on advanced manufacturing technology and Materials Engineering, AMTME 2024

作者： Wang, Zengquan Zhao, Guangshuo Jing, Guoxi Zhang, Liqiang Hou, Yexing Pang, Jianchao China North Engine Research Institute Tianjin300400 China Tianjin Key Laboratory of New Energy Automobile Power Transmission and Safety Technology School of Mechanical Engineering Hebei University of Technology Tianjin300130 China School of Mechanical Engineering Hebei University of Technology Tianjin300400 China Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China

In this paper, for the 34CrNiMo6 steel material used in diesel engine connecting rods, the low-cycle fatigue properties and failure mechanism were studied. The metallographic structure of 34CrNiMo6 has been investigated by using optical microscopes, scanning electron microscopes, and transmission electron microscopes. Tensile tests and low-cycle fatigue experiments were performed at different levels of strain amplitudes, and the microstructural changes were monitored. The examination indicates that the structure of 34CrNiMo6 steel consisted primarily of a ferrite base and small spherical and rod-shaped carbides, with a mean particle size measuring 2 μm. It had exceptional mechanical characteristics of high strength and moderate plasticity. The total strain amplitude (TSA) of 34CrNiMo6 steel affected the cycling behavior, which was stable at low TSA (0.2% ~ 0.3%). At high TSA (0.4% ~ 0.7%), a large number of dislocations were annihilated through the dynamic recovery process, showing a typical cyclic softening phenomenon. The low-cycle fatigue failure behavior was mainly a combined mode of quasi-cleavage fracture and cross-grain fracture. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Tensile testing

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