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7th International Conference on Communication and Information Systems, ICCIS 2023

作者： Sun, Shaoyu Shi, Chunhao Wang, Chunyang Liu, Xuelian School of Electronic and Information Engineering Changchun University of Science and Technology Changchun China Xi'an Technological University Xi'an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi'an China

ISBN: (纸本)9798350330540

With the advancement of autonomous driving technology, Lidar-driven 3D object detection has become a focal point of research. However, many existing point-driven approaches face challenges due to rigid local dependencies and entangled foreground-background points. The direct utilization of point clouds for 3D object detection is also complicated by the inherent sparsity and irregularities of Lidar data. To counter these challenges, we propose AGT-SSD a single-stage graph-based 3D detector to improve object performance especially for small objects. Which comprises two critical modules adaptive graph feature convolution module (AGF) and a point cloud transformer layer with self-attention mechanism (TSA). AGF module utilizes an adaptive graph kernel to process graph features, facilitating feature interactions within the feature domain to help detect small objects. Non-local transformer layer incorporates self-attention module, designed to capture long-range dependencies to encode global sematic and spatial feature to improve detection performance. This enhancement is attributed to the geometric structure refinement through graph convolution methods and the use of a self-attention mechanism to grasp long-range dependencies. Both modules employ non-local operations, adapt at discerning long-range correlations. Extensive experiments on the KITTI dataset demonstrated that our detector is not flexible and plug and play for other detectors but also highlight the superior accuracy of our method compared to other state-of-the-art detectors. © 2023 IEEE.

关键词： Adaptive Graph Kernel Object detection Point Cloud Transformer

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Design and performance of a high-speed and low-noise preamplifier for SiPM

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Nuclear Science and Techniques 2023年第11期34卷 93-102页

作者： Xi‑Yang Wang Hong‑Yu Zhang De‑Qing Fang Wan‑Bing He Xiao‑Long Wang Qi‑Bin Zheng Shi‑Ming Zou Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE)and Institute of Modern Physics Fudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China Laboratory of Radiation Detection and Medical Imaging and School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Considering the R&D for upgrading the K^(0)_(L) andμdetectors in the Belle II experiment using a scintillator and silicon pho-tomultiplier(SiPM),we designed a compact high-speed and low-noise *** preamplifier demonstrated a good gain stability,bandwidth of 426 MHz,baseline noise level ofσ≈0.6 mV,dynamic range of up to170 mV of the input signal amplitude,good time resolution of 20 ps,and it can be comprehensively applied to *** pole-zero-cancelation in the preamplifier reduces both the rise and fall times of the SiPM signal,which can significantly improve the time resolution and reduce the pile-up when using a large SiPM or an array of *** combinations of the preamplifier and several types of SiPMs demonstrated time resolutions better than 50 ps for most cases;when the number of detected photons was larger than 60,a time resolution of approximately 25 ps was achieved.

关键词： Silicon photomultiplier High-speed amplifier Low noise High time resolution

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A polarization image false color fusion method for target against dark background 8

A polarization image false color fusion method for target ag...

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8th Symposium on Novel Photoelectronic detection technology and Applications

作者： Wu, Lingxia Wu, Yunzhi Jia, Rong Huang, Qinchao Army Academy of Artillery and Air Defense of PLA Anhui Hefei230031 China Anhui Key Laboratory of Polarized Light Imaging Detection Technology Hefei230031 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

To overcome the draw back of traditional false color fusion methods for polarization images, a new false color fusion method is proposed in this ***, all of the polarization parameter images are obtained by polarization information *** the robustness of the obtained polarization information is estimated by the spatial distribution characteristics of the polarization angle. Finally, an alternate mapping for the strong polarization characteristic region (the target region) and the noise region (the background region) is *** experimental results show that the proposed method has good quality and is easy to be further segmented and identified. © 2022 SPIE

关键词： Image fusion

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The study on subsurface damage detection technology of optical components based on high efficiency tagging of carbon quantum dots 6

The study on subsurface damage detection technology of optic...

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6th Conference on Frontiers in Optical imaging and technology: imaging detection and Target Recognition

作者： Li, Zhengze Wang, Chunyang Liu, Xuelian Wu, Yajie Cui, Yana Li, Rong He, Wen School of Electronic and Information Engineering Changchun University of Science and Technology Changchun130022 China Xi'an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi'an Technological University Xi'an710021 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

Optical elements are widely used in large optical systems such as laser inertial confinement fusion and astronomical telescopes, but subsurface damage (SSD) generated in the processing of optical components can cause degradation of their performance such as laser damage threshold and imaging quality. Accurate detection of SSDs is necessary to guide the processing of optical components and improve their performance. NDT technology for SSD inspection of optical components based on quantum dots (QDs) tagging breaks through the limitation of traditional NDT process requiring low roughness of optical surfaces and has a broad development prospect in the field of SSD inspection of optical components. Efficient tagging of SSD with QDs can be a key factor to improve the accuracy of SSD detections, but there is a lack of research on how to efficiently tag SSDs with QDs. To solve the above problems, this paper proposes a nondestructive detection technique for SSD of optical components based on high efficiency tagging of CQDs. Firstly, we analyze the characteristics of optical component processing and quantum dot-based detection technology, and determine the factors affecting the effect of QDs on the labeling of optical component SSDs. The effects of different factors on QDs-labeled SSDs were analyzed according to the distribution and fluorescence intensity of SSDs. The results showed that: (1) the changes of pressure and temperature during the process did not have significant effects on the fluorescence properties of CQDs;(2) the excitation wavelength, fluorescence emission peak, solution concentration, solution dose, excitation light power and the pH of the environment in which CQDs are located have certain effects on their fluorescence properties and SSD tagging results. This study provides a useful reference for the efficient labeling and accurate detection of optical components SSD. © 2024 SPIE. All rights reserved.

关键词： Damage detection

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GFFS: Gravitational-Force Feature Real Time Segmentation of 3D Point Cloud

GFFS: Gravitational-Force Feature Real Time Segmentation of ...

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2022 IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2022

作者： Shi, Chunhao Wang, Chunyang Liu, Xuelian Xiao, Bo Sun, Shaoyu Xi, Guan Qiu, Wenqian Changchun University of Science and Technology School of Electronic and Information Engineering Changchun130022 China Xi'an Technological University Xi'an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi'an710021 China

ISBN: (纸本)9781665409025

Segmentation of point cloud is a momentous technology for autonomous vehicles. Due to the diversity and complexity of road environment, instance segmentation based on point cloud is a challenging task. Addressing this challenge, a gravitational-force feature segmentation of 3D point cloud (GFFS) is proposed. Firstly it divides the point into areas, secondly it sets the radius of the spherical neighborhood corresponding to each area based on the size and density of point cloud, thirdly it calculates the gravitational forces between the space of each spherical neighborhood and the barycenter of the area. GFFS performs instance segmentation of all kinds of objects in point cloud scene by analyzing the magnitude and continuity of gravitational forces. Finally, the superiority and effectiveness of the algorithm are verified by experiments. © 2022 IEEE.

关键词： Gravitation

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Atmospheric Pollution Monitoring Based on Fourier Transform Infrared Spectrometer 2

Atmospheric Pollution Monitoring Based on Fourier Transform ...

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2nd International Conference on Optical imaging and Measurement, ICOIM 2023

作者： Sun, Jun Xu, Zhijing Lin, Yinghui Chen, Ren Wang, Zhanhu Shanghai Maritime University College of Information Engineering Shanghai China Shanghai Institute of Technical Physics State Key Laboratory of Infrared Physics Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9798350358636

Air pollution has serious impacts on human health and the environment, thus accurate monitoring and analysis of air pollutants is of vital importance. As an efficient monitoring technology, the Fourier Transform Infrared Spectrometer has played a wide role in the study of air pollution. This paper elaborates on the basic principles and working mechanisms of the Fourier Transform Infrared Spectrometer and discusses the important role in air pollution monitoring, also analyzes the development trend of the Fourier Transform Infrared Spectrometer in air monitoring. © 2023 IEEE.

关键词： Air pollution

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A liquid crystal polarization grating beam scanning component driver based on MCU

A liquid crystal polarization grating beam scanning componen...

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2022 IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2022

作者： Wei, Xuyang Wang, Chunyang Xie, Da Yuan, Kai Xi'an Technological University Xi'an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi'an710021 China Changchun University of Science and Technology School of Electronic and Information Engineering Changchun130022 China

ISBN: (纸本)9781665409025

Liquid crystal polarization grating (LCPG) is a new type of grating device based on geometric phase principle which has electro-optic tunability and polarization tunability. In this paper, a multi-channel programmable LCPG driver is designed for the cascaded LCPG components. The programmable beam direction of the beam scanning component based on the LCPG is realized by adjusting the driving voltage at both ends of each monolithic LCPG. The driver voltage adjustment range is 0Vpp-38Vpp, and the voltage resolution is 0.0195V. Taking the 3-piece cascaded LCPG beam scanning system as an example for the driver performance test. The results show that the driver designed in this paper has good driving performance for the cascaded LCPG. © 2022 IEEE.

关键词： Timing circuits

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Introduction of high-speed data acquisition system scheme based on FPGA 3

Introduction of high-speed data acquisition system scheme ba...

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3rd International Conference on Electronic Information Engineering and Data Processing, EIEDP 2024

作者： Lin, Yinghui Xu, Zhijing Sun, Jun Chen, Ren College of Information Engineering Shanghai Maritime University Shanghai China Shanghai Institute of Technical Physics State Key Laboratory of Infrared Physics Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9781510680531

Signal acquisition system is widely used in various fields of reality, due to the data acquisition rate and processor performance enhancement as well as the development of sensor arrays and other technologies, the data acquisition system acquisition and transmission of the signal is exponential growth, in order to solve the high-speed signal acquisition process of the large amount of data, real-time, transmission rate and other issues, the study of high-speed acquisition of signals as well as the transmission program has an important practical significance. FPGA is very suitable to be applied in high-speed signal acquisition system because of its characteristics. In this paper, we firstly introduce the composition of a typical high-speed signal acquisition system based on FPGA, and then briefly introduce the function and development process of each module of the system and introduce the mainstream programs used in several key modules. In engineering applications, different programs should be used in different modules in conjunction with the actual. © 2024 SPIE.

关键词： Field programmable gate arrays (FPGA)

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Quenching circuit for SPAD detectors based on monostable trigger

Quenching circuit for SPAD detectors based on monostable tri...

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2022 IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2022

作者： Xie, Da Wang, Chunyang Yuan, Kai Wei, Xuyang Changchun University of Science and Technology School of Electronic and Information Engineering Changchun130022 China Xi'an Technological University Xi'an Key Laboratory of Active Photoelectric Imaging Detection Technology Xi'an710021 China

ISBN: (纸本)9781665409025

Single Photon Avalanche Diode(SPAD) is a common single photon detector in laser ranging field because of its ultra-high sensitivity and the ability of remote target detection and imaging. In this paper, aiming at the avalanche current suppression problem of SPAD, the interface circuit based on MOS tube and the SPAD active and passive mixed quenching circuit based on monostable trigger are designed and simulated, which realize the rapid quenching and extraction of SPAD avalanche signal, eliminate the influence of after-pulse, and improve the single photon detection efficiency of SPAD. The results show that the quenching time of the active and passive hybrid quenching circuit designed in this paper is 478ps and the death time is 4.8ns, the maximum photon count rate is close to 188Mcps, which can meet the application requirements of laser detection and imaging. © 2022 IEEE.

关键词： Timing circuits

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Whole-Brain Connectome of GABAergic Neurons in the Mouse Zona Incerta

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Neuroscience Bulletin 2022年第11期38卷 1315-1329页

作者： Yang Yang Tao Jiang Xueyan Jia Jing Yuan Xiangning Li Hui Gong Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsMoE Key Laboratory for Biomedical PhotonicsHuazhong University of Science and TechnologyWuhan 430074China Research Unit of Multimodal Cross Scale Neural Signal Detection and Imaging Chinese Academy of Medical SciencesHUST-Suzhou Institute for BrainsmaticsJITRISuzhou 215123China

The zona incerta(ZI)is involved in various functions and may serve as an integrative node of the circuits for global behavioral ***,the long-range connectivity of different sectors in the mouse ZI has not been comprehensively ***,we obtained whole-brain images of the input and output connections via fluorescence micro-optical sectioning tomography and viral *** principal regions in the input-output circuits of ZI GABAergic neurons were topologically *** 3D distribution of cortical inputs showed rostro-caudal correspondence with different ZI sectors,while the projection fibers from ZI sectors were longitudinally organized in the superior *** results show that the medial and lateral ZI are two different major functional compartments,and they can be further divided into more subdomains based on projection and input *** study provides a comprehensive anatomical foundation for understanding how the ZI is involved in integrating different information,conveying motivational states,and modulating global behaviors.

关键词： Zona incerta GABAergic neurons Whole-brain connectome Input circuit Output circuit Topological connection

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