2024
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Record 385 of
Title:Detecting the Background-Similar Objects in Complex Transportation Scenes
Author Full Names:Sun, Bangyong(1); Ma, Ming(1); Yuan, Nianzeng(2); Li, Junhuai(2); Yu, Tao(3)Source Title:IEEE Transactions on Intelligent Transportation SystemsLanguage:EnglishDocument Type:Journal article (JA)Abstract:With the development of intelligent transportation systems, most human objects can be accurately detected in normal road scenes. However, the detection accuracy usually decreases sharply when the pedestrians are merged into the background with very similar colors or textures. In this paper, a camouflaged object detection method is proposed to detect the pedestrians or vehicles from the highly similar background. Specifically, we design a guide-learning-based multi-scale detection network (GLNet) to distinguish the weak semantic distinction between the pedestrian and its similar background, and output an accurate segmentation map to the autonomous driving system. The proposed GLNet mainly consists of a backbone network for basic feature extraction, a guide-learning module (GLM) to generate the principal prediction map, and a multi-scale feature enhancement module (MFEM) for prediction map refinement. Based on the guide learning and coarse-to-fine strategy, the final prediction map can be obtained with the proposed GLNet which precisely describes the position and contour information of the pedestrians or vehicles. Extensive experiments on four benchmark datasets, e.g., CHAMELEON, CAMO, COD10K, and NC4K, demonstrate the superiority of the proposed GLNet compared with several existing state-of-the-art methods. ? 2000-2011 IEEE.Affiliations:(1) Xi'an University of Technology, School of Printing, Packaging and Digital Media, Xi'an; 710048, China; (2) Xi'an University of Technology, School of Computer Science and Engineering, Xi'an; 710048, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology of CAS, Xi'an; 710119, ChinaPublication Year:2024Volume:25Issue:3Start Page:2920-2932DOI Link:10.1109/TITS.2023.3268378數(shù)據(jù)庫ID（收錄號）:20232114129082 -
Record 386 of
Title:Multiple marine algae identification based on three-dimensional fluorescence spectroscopy and multi-label convolutional neural network
Author Full Names:Li, Ruizhuo(1,2); Gao, Limin(1); Wu, Guojun(1,3); Dong, Jing(1,2)Source Title:Spectrochimica Acta - Part A: Molecular and Biomolecular SpectroscopyLanguage:EnglishDocument Type:Journal article (JA)Abstract:Accurate identification of algal populations plays a pivotal role in monitoring seawater quality. Fluorescence-based techniques are effective tools for quickly identifying different algae. However, multiple coexisting algae and their similar photosynthetic pigments can constrain the efficacy of fluorescence methods. This study introduces a multi-label classification model that combines a specific Excitation-Emission matric convolutional neural network (EEM-CNN) with three-dimensional (3D) fluorescence spectroscopy to detect single and mixed algal samples. Spectral data can be input directly into the model without transforming into images. Rectangular convolutional kernels and double convolutional layers are applied to enhance the extraction of balanced and comprehensive spectral features for accurate classification. A dataset comprising 3D fluorescence spectra from eight distinct algae species representing six different algal classes was obtained, preprocessed, and augmented to create input data for the classification model. The classification model was trained and validated using 4448 sets of test samples and 60 sets of test samples, resulting in an accuracy of 0.883 and an F1 score of 0.925. This model exhibited the highest recognition accuracy in both single and mixed algae samples, outperforming comparative methods such as ML-kNN and N-PLS-DA. Furthermore, the classification results were extended to three different algae species and mixed samples of skeletonema costatum to assess the impact of spectral similarity on multi-label classification performance. The developed classification models demonstrated robust performance across samples with varying concentrations and growth stages, highlighting CNN's potential as a promising tool for the precise identification of marine algae. ? 2024 Elsevier B.V.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) College of Photoelectricity, University of Chinese Academy of Science, Beijing; 100049, China; (3) Laoshan Laboratory, Shandong, Qingdao; 266237, ChinaPublication Year:2024Volume:311Article Number:123938DOI Link:10.1016/j.saa.2024.123938數(shù)據(jù)庫ID（收錄號）:20240815614850 -
Record 387 of
Title:Compensation control strategy for photoelectric stabilized platform based on disturbance observation
Author Full Names:Chang, Sansan(1,2,5); Cao, Jianzhong(1,5); Pang, Ji(3); Zhou, Feihang(3); Chen, Weining(1,4,5)Source Title:Aerospace Science and TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract:The accuracy and stability of the photoelectric stabilized platform will be inevitably affected by the friction disturbance and the base platform disturbance in the actual operation. To improve the disturbance rejection performance, two kinds of the disturbance observers are employed and compared in this paper, including the adaptive proportion-integrator observer and the robust sliding mode observer. The disturbances of the friction torque and the moving base are observed, then these observed values are compensated to the voltage loop by the feedback and feedforward, respectively. While the disturbances of the friction torque and the shaking base are compensated, the parameters of the speed stability loop are also tuned to improve the performance of this photoelectric stabilized platform. Finally, the effectiveness of the proposed method is verified by both simulations and experiments. The results show that the proposed disturbance compensation control method based on the sliding mode observer has strong robustness and can effectively reduce the impact of system disturbances. ? 2024Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (4) School of Automation, Northwestern Polytechnical University, Xi'an; 710129, China; (5) Key Laboratory of Spacecraft Optical Imaging and Measurement Technology of XI'AN, Xi'an; 710119, ChinaPublication Year:2024Volume:145Article Number:108909DOI Link:10.1016/j.ast.2024.108909數(shù)據(jù)庫ID（收錄號）:20240615508203 -
Record 388 of
Title:Neural-network enabled octave-spanning coherent diffraction imaging
Author Full Names:Li, Boyang(1); Xiao, Zehua(1); Yuan, Hao(1,2); Xue, Bing(1); Cao, Huabao(1,2); Wang, Hushan(1,2); Zhao, Wei(1,2); Fu, Yuxi(1,2)Source Title:Applied Physics LettersLanguage:EnglishDocument Type:Journal article (JA)Abstract:Ultrafast lasers, providing the shortest pulses worldwide, have been playing a vital role in the ultrafast imaging technology. The temporal resolution has been increasing rapidly in recent years but finally reaches its limit—the pulse width approaches photoperiods, causing significant broadening of spectral bandwidth. The state-of-the-art high harmonics generation based attosecond lasers, with pulse widths reaching ～50 attoseconds, present octave-spanning spectra. This brings a major challenge to traditional imaging methods, as they result in unbearable chromatic aberrations. To address this challenge, we propose the neural-network approach for broadband imaging and demonstrate its effectiveness empirically by facilitating rapid coherent diffractive imaging under octave-spanning supercontinuum illumination. The proposed method remains effective when deployed with three-octave-spanning spectra, supporting both continuous and comb-like profiles as indicated by simulations. Such lensless imaging method, applicable to both extreme ultraviolet and soft x-ray sources, potentially provides an approach to attosecond imaging. ? 2024 Author(s).Affiliations:(1) Center for Attosecond Science and Technology (CAST), Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:125Issue:25Article Number:251104DOI Link:10.1063/5.0231298數(shù)據(jù)庫ID（收錄號）:20245217566290 -
Record 389 of
Title:Optimization of multilayer capacitive charge division anode for MCP imaging detectors
Author Full Names:Yang, Kai(1,2); Bai, Yonglin(1); Wang, Bo(1); Cao, Weiwei(1); Zhu, Bingli(1); Bai, Xiaohong(1); Zheng, Jinkun(1); Zhang, Shengdan(1,2); Wang, Chao(1); Chen, Zhen(1); Yang, Yang(1)Source Title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentLanguage:EnglishDocument Type:Journal article (JA)Abstract:A three-dimensional numerical model developed based on the finite element method to simulate the position-reconstruction performance of multilayer capacitive anodes is presented. The charge collection efficiency and position nonlinearity are calculated for different electrode layers, patterns, and sizes, as well as the distance between the bottom microchannel plate (MCP) and induction layer. The position nonlinearity exhibits an approximately linear relationship with the electrode size and the distance between the bottom MCP and induction layer. By increasing the electrode area in the perimeter region and designing 2.2 mm square electrodes in the central region, a position nonlinearity of 3.36% with a distance of 5 mm between the bottom MCP and induction layer is achieved. The imaging performance of the six multilayer capacitive anodes is evaluated using a custom-designed detector prototype, and the experimental results validate the simulation results. The comprehensively optimized capacitive anode shows an imaging nonlinearity of 0.91% in the experiment. ? 2024Affiliations:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences (UCAS), Beijing; 100049, ChinaPublication Year:2024Volume:1063Article Number:169285DOI Link:10.1016/j.nima.2024.169285數(shù)據(jù)庫ID（收錄號）:20241515861844 -
Record 390 of
Title:Simulation and research on high frequency crosstalk signals in position-sensitive photodetectors
Author Full Names:Duan, Jinyao(1,2); Zheng, Jinkun(1); Yang, Yang(1); Pang, Ziliang(1,2); Zuo, Xiaoyun(1,2); Bai, Yonglin(1,2)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:2024 Conference on Spectral Technology and Applications, CSTA 2024Conference Date:May 9, 2024 - May 11, 2024Conference Location:Dalian, ChinaConference Sponsor:Chinese Society for Optical EngineeringAbstract:As photodetectors rapidly develop towards high speed and huge scale, the signal frequency of digital circuits reaches hundreds of MHz or even GHz.As the operating frequency continues to increase, traditional microstrip lines cannot be simply regarded as metal lines and are prone to signal integrity problems.This paper uses HFSS (High Frequency Simulator Structure) software to establish a high-speed microstrip line crosstalk simulation analysis model. Based on this model, the crosstalk problem of discontinuous microstrip lines under high-frequency conditions is studied, and its near-end crosstalk (S31) and far-end crosstalk (S41) are obtained. The influence of signal frequency, microstrip line thickness, microstrip line width, and microstrip line spacing on the crosstalk intensity is analyzed. The results show that the crosstalk intensity of discontinuous microstrip lines increases first and then tends to be flat with th1e change of signal frequency; the near-end crosstalk S31 shows an increasing trend with the increase of microstrip line thickness; the near-end crosstalk S31 increases with the increase of microstrip line width; the crosstalk intensity decreases with the increase of microstrip line spacing. ? 2024 SPIE.Affiliations:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences (UCAS), Beijing; 100049, ChinaPublication Year:2024Volume:13283Article Number:132832SDOI Link:10.1117/12.3036929數(shù)據(jù)庫ID（收錄號）:20245217584283 -
Record 391 of
Title:Domino-like water film manipulation with multifunctionality
Author Full Names:Yang, Pengyu(1); Yin, Kai(1,2,3); Li, Xun(4); Song, Xinghao(1); Wang, Lingxiao(1); Pei, Jiaqing(1); Wu, Tingni(1); Huang, Yin(1); Awan, Saif U.(5); Khalil, Ahmed S. G.(6)Source Title:Applied Physics LettersLanguage:EnglishDocument Type:Journal article (JA)Abstract:Domino effect is widely known and intuitively understood. Although the concept is frequently used, a few works combine it with liquid manipulation. Liquid manipulation is essential in many fields; however, large-scale liquid manipulation using minimal forces is still a challenge. Here, we show a domino-like liquid manipulation process triggered by wind on heterogeneously wettable surfaces. This effect was demonstrated using velocities of wind between 2.2 and 3.0 m/s on structured surfaces containing water film thickness in the range of 2.5-4.5 mm. The domino dewetting surfaces were shown on various patterned designs with 32-224 mm in length; however, under ideal conditions, the effect could be infinitely transmissible. Such a concept might apply to long-distance directional transportation of floats, and bed bottom dust cleaning. Other designs, such as a branched tree structure, can drive larger objects, and remote circuit interrupters were shown. This method provides an approach for manipulation of water movement by tiny forces triggered toward multifunctionality. ? 2024 Author(s).Affiliations:(1) Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha; 410083, China; (2) State Key Laboratory of Precision Manufacturing for Extreme Service Performance, College of Mechanical and Electrical Engineering, Central South University, Changsha; 410083, China; (3) State Key Laboratory of Intelligent Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan; 430000, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (5) Department of Electrical Engineering, College of Electrical and Mechanical Engineering, National University of Sciences and Technology (NUST), Islamabad; 44000, Pakistan; (6) Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria; 179, EgyptPublication Year:2024Volume:125Issue:5Article Number:051602DOI Link:10.1063/5.0225775數(shù)據(jù)庫ID（收錄號）:20243216825437 -
Record 392 of
Title:Design of Optical System for Lightweight All-day Star Sensor
Author Full Names:Chen, Bofan(1,2); Xue, Yaoke(1,2,3,4); Shen, Yang(1,4); Ye, Shuifu(1,4); Wang, Hu(1,2,4); Xie, Yongjie(1,4)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Astronomical navigation is a navigation method which obtains attitude information of the installation platform by detecting the relative positions of stars in space. It has the significant advantages of strong anti-interference ability，high measurement accuracy，and no accumulation of errors over time，and has been widely applied. As an important device in astronomical navigation，star sensor is used to measure the relative attitude information of carrier. It uses stars as reference sources to calculate the precise attitude information of carrier by comparing with the star maps. Unlike GPS navigation signal，which is prone to rejection and accumulates inertial navigation errors over time，star sensor has several advantages，such as high precision attitude measurement ability，autonomous working ability，stable passive measurement working mode，and anti-electromagnetic interference ability. It has become one of the most necessary devices for attitude and orbit control systems on platforms such as ships，aircrafts，and satellites. Star sensor navigation technology was first applied to satellite platforms outside the atmosphere，and the dark background in outer space has a relatively small impact on the recognition of dark star targets. In recent years，with the development of all-day star sensor optical technology，astronomical/inertial integrated navigation technology has been rapidly applied to airborne platforms and near-space aircraft platforms in the atmosphere. The working altitude in the near space of 20~100 km has attracted more and more attention，and under the daytime conditions in the atmosphere，strong sky background noise caused by atmospheric scattering in the near space leads to the submergence of dark star signals. Meanwhile，the platform working in near space has strict limitations on the volume， weight， working environment， and stray light suppression ability of the system，which puts high requirements on the design of optical system for the star sensor that works in the near space. The domestic all-day star sensor optical system mostly adopts transmissive structure and catadioptric structure. The catadioptric structure mostly adopts low expansion materials，such as indium steel，fused silica，microcrystalline glass，ULE，etc. to carry out athermal design，which leads to the problems that cannot meet the requirements of lightweight design，such as large mass and volume. With the development of materials science and optical precision manufacturing technology，aluminum alloy which is a representative of metal materials can serve as both the reflector material and the supporting structural material. It has many advantages such as low density，high thermal conductivity，low processing difficulty，and short processing cycle，and has been widely used in the optical system design both domestically and internationally. This article proposes a design scheme for the lightweight star sensor optical system，by using aluminum alloy as the primary，secondary mirror material，and load-bearing structural material，in response to the requirements for lightweight，wide temperature operation，and stray light suppression of near space all-day star sensor. By analyzing the focal temperature characteristics of coaxial dual reflector system and comparing several kinds of commonly used star sensor materials，a lightweight all-day star sensor optical system was designed using a microcrystalline aluminum alloy RSA-443 as the primary reflector，secondary reflector，and support structure. The star sensor optical system has a focal length of 450 mm，an effective entrance pupil diameter of 80 mm，a field of view of 2ω= 3.6° ，and a working spectrum range of 0.8~1.1 μm. Adopting a passive optical athermal technology to complete the athermal design，the system has good temperature adaptation in the temperature range of ? 20~55 ℃ . Through the design of lens hood，the Point Source Transmittance （PST） of system beyond sunlight exclusion angle of 30° is better than 10?6，which meets the requirement for high stray light suppression ratio. Compared with the design scheme of indium steel truss with fused silica or microcrystalline glass，which has low expansion coefficient，the overall mass of the system is reduced by 37%，reducing the load weight of the platform dramatically，improving the stability and durability of the system. It meets the system lightweight requirement while ensuring imaging quality，and provides effective support for the development of optical technology for all-day star sensor working in near space. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Youth Innovation Promotion Association CAS, Beijing; 100029, China; (4) Xi'an Space Sensor Optical Technology Engineering Research Center, Xi'an; 710119, ChinaPublication Year:2024Volume:53Issue:12Article Number:1222001DOI Link:10.3788/gzxb20245312.1222001數(shù)據(jù)庫ID（收錄號）:20250317694674 -
Record 393 of
Title:Design of electronic readout system for resistive anode based on FPGA
Author Full Names:Song, Yuchao(1); Zhang, Wenwen(1); Zheng, Jinkun(2,3); Yang, Yang(2); Bai, Yonglin(2,3); La, Anpeng(1); Duan, Jinyao(2,3)Source Title:IEICE Electronics ExpressLanguage:EnglishDocument Type:Journal article (JA)Abstract:This paper presents an electronic readout system based on the resistance anode, which is capable of processing the output signal from the resistance anode. This design divides the electronic readout circuit into two parts: analog circuit design and digital circuit design. The analog pre-processing circuit the electric charge signal from the resistive anode detector into a voltage signal and amplifies it and the digital part consists of a trapezoidal double-channel shaping algorithm implemented in FPGA. This design overcomes pulse pile-up at high count rates. ? 2024 Institute of Electronics Information Communication Engineers. All rights reserved.Affiliations:(1) School of Electronic Engineering, Xi'an University of Post & Telecommunications, Xi'an; 710121, China; (2) Key Laboratory of Ultra fast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), ChineseAcademy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences (CAS), Beijing; 100049, ChinaPublication Year:2024Volume:21Issue:10Article Number:e20240117DOI Link:10.1587/elex.21.20240117數(shù)據(jù)庫ID（收錄號）:20242416256529 -
Record 394 of
Title:Design and Control Strategy of Wedge-type Automatic Leveling Mechanism
Author Full Names:Li, Xiangyu(1); Han, Jingyu(1,2); Hao, Wei(1); Xie, Meilin(1); Lian, Xuezheng(1); Ruan, Ping(1); Tian, Guangyuan(1)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:The theodolite，an optical instrument utilized for measuring the azimuth and pitch angle of spatial targets， operates on the principle of angle measurement， finding extensive application in aviation，construction， and various other industries. Functioning as a precision optical measuring device， the theodolite necessitates meticulous high-precision leveling through a leveling mechanism prior to operation. This ensures alignment of the vertical axis with the earth's plumb line，thereby guaranteeing the accuracy of azimuth and pitch angle measurements within the geodetic coordinate system. The leveling mechanism within the theodolite predominantly consists of screw jack and wedge types，both manually operated. Employing a cyclic approximation leveling mode， the theodolite achieves semi-locking post-coarse leveling at wide angles，followed by re-locking after fine leveling at narrow angles，thereby completing the leveling process while maintaining adequate stable support. However， in practical engineering applications， the proficiency and experience of the operator significantly impact the time required to adjust the theodolite's vertical axis to an error of ≤5 ″，a process that typically takes around 30 minutes. This duration constitutes 50% of the total deployment time of the theodolite. Attaining a tilt error of ≤2 ″necessitates additional leveling cycles and prolonged operation time. Consequently，the time-consuming nature of high-precision manual leveling severely impedes the deployment speed of the theodolite. Moreover，the cyclic approximation leveling mode's influence on fine leveling of the locking mechanism，particularly at small angles，relies on the elastic or plastic deformation of transmission components within the leveling mechanism. Repeated leveling cycles hasten the deterioration of the leveling mechanism，significantly undermining the theodolite's reliability. Addressing the challenges associated with high-precision manual leveling，this paper introduces the design of an automatic leveling mechanism of the wedge type， characterized by stable self-locking properties，extensive stroke，and high resolution. Through physical modeling，calculation models for anti-torsion friction force， motor torque transmission， leveling angle resolution， and stroke are established，facilitating the determination of core design parameters. Furthermore，an analysis of the leveling strategy for the wedge-type automatic leveling mechanism is conducted，proposing a parallel leveling control strategy as an alternative to the commonly used serial approach in manual operation. This parallel strategy enhances leveling efficiency by enabling electro-mechanical leveling components to achieve synchronized motion. Experimental validation confirms that the designed wedge-type automatic leveling mechanism achieves leveling within a range of ±0.25° ，with a resolution of ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Key Laboratory of Space Precision Measurement Technology of CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:53Issue:9Article Number:0922004DOI Link:10.3788/gzxb20245309.0922004數(shù)據(jù)庫ID（收錄號）:20244117178917 -
Record 395 of
Title:Flexible fiberbotic laser scalpels: Material and fabrication challenges
Author Full Names:Zou, Yuqi(1,2); Ren, Zhihe(1,2); Xiang, Yuanzhuo(1,2); Liu, Chao(1,2); Gao, Anzhu(3,4); Huang, Shaoping(4); Yang, Lvyun(1); Hou, Chong(5); Guo, Haitao(6); Yang, Guang-Zhong(4); Tao, Guangming(1,2,4)Source Title:MatterLanguage:EnglishDocument Type:Journal article (JA)Abstract:Rapidly developed fiber lasers have shown great potential in interventional urology, inspiring the use of advanced laser delivery to meet the demand for manipulation in other complex surgical scenarios. While medical robots are enhancing precision in the field of minimally invasive surgery, laser ablation has been demonstrated as a promising candidate compared to traditional mechanical cutting tools in interventions. Nevertheless, based on their ablation mechanisms, the advantages of lasers are still not fully leveraged. In this Perspective, we outline how fiber-shaped robots combined with laser scalpels are primed to emerge as the next generation of medical robots to achieve minimally invasive surgery. We review the mechanisms involved, analyze their applications, and discuss several prospects for future applications. ? 2024 Elsevier Inc.Affiliations:(1) State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) Key Laboratory of Vascular Aging, Ministry of Education, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan; 430030, China; (3) Department of Automation, Shanghai Jiao Tong University, Shanghai; 200240, China; (4) Institute of Medical Robotics, Shanghai Jiao Tong University, Shanghai; 200240, China; (5) School of Optical and Electronic Information & Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan; 430074, China; (6) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Shaanxi, Xi'an; 710119, ChinaPublication Year:2024Volume:7Issue:3Start Page:758-771DOI Link:10.1016/j.matt.2024.01.007數(shù)據(jù)庫ID（收錄號）:20240915657499 -
Record 396 of
Title:Effects and optimizations of image charge technology on the imaging performance of capacitive division image readout MCP detectors
Author Full Names:Wang, Bo(1); Yang, Kai(1,2); Bai, Yonglin(1); Cao, Weiwei(1); Bai, Xiaohong(1); Zheng, Jinkun(1)Source Title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentLanguage:EnglishDocument Type:Journal article (JA)Abstract:A finite element model is proposed to investigate the impact of image charge technology on the imaging performance of capacitive division image readout (C-DIR) devices. Through detailed simulation analysis, we explore the charge density of the induction layer and each electrode layer in the multilayer capacitive anode. The position nonlinearity is calculated for various resistances per square of the induction layer and substrate thicknesses. The simulation results indicate a strong linear correlation between the position nonlinearity and substrate thickness, and an exponential decay relationship with the logarithmic resistance per square of the induction layer. The C-DIR detector is experimentally tested for imaging nonlinearity and counting rate, with the resistance per square of the induction layer ranging from 0.005 to 1000 MΩ, and the substrate thickness ranging from 1 to 5 mm. The experimental results validate the simulation conclusions and reveal the impact of the "charge accumulation effect" and "shielding effect" on the imaging performance of the detector, as well as the "imaging compression" phenomenon. Optimized image charge readout technology enables the C-DIR detector to achieve an imaging nonlinearity of 1.53% in the experiment. ? 2024Affiliations:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Graduate School of Chinese Academy of Sciences (CAS), Beijing; 100049, ChinaPublication Year:2024Volume:1069Article Number:169879DOI Link:10.1016/j.nima.2024.169879數(shù)據(jù)庫ID（收錄號）:20243817070436