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Structural Damage Detection and Localization Using Response Difference Transmissibility

Journal of Shanghai Jiaotong university(Science) 2024年第6期29卷 1126-1138页

作者： WANG Zengwei DING Lei Shanghai Institute of Technical Physics Key Laboratory of Infrared System Detection and Imaging TechnologyChinese Academy of SciencesShanghai 200083China

In this paper,a novel method is proposed for structural damage detection and *** key of the proposed method is the use of the response difference transmissibility(RDT)for damage *** RDT is defined to relate response differences of the system to be evaluated and those of the original *** invariance properties of RDT are also *** on this,a damage indicator is proposed,and the benefits are verified by a numerical ***,the proposed method is illustrated and validated by finite element simulations and experimental case studies.

关键词： damage detection damage localization transmissibility mechanical vibrations

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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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Optical processing strategies for micro-imaging small-aperture Wolter mirrors 7

Optical processing strategies for micro-imaging small-apertu...

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7th Global Intelligent Industry Conference, GIIC 2024

作者： Li, Yaran State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

ISBN: (纸本)9781510682986

The Wolter microscope, characterized by its high spatial resolution, large geometric solid angle, and broadband achromatic correction, serves as an ideal initial configuration for the next generation of X-ray imaging diagnostic techniques. Nevertheless, the development of small-aperture Wolter mirrors encounters significant challenges, which primarily hinder their widespread application. This article presents a design approach for micro-imaging small-aperture Wolter microscopes, considering both optical design principles and mirror preparation techniques. It reveals the intricate trade-off relationships among spatial resolution, collection efficiency, and the feasibility of optical processing. By effectively integrating optical principles with manufacturing practices, a staged development roadmap for small-aperture Wolter mirrors is proposed. Through technological convergence, the electroforming nickel preparation process can be gradually mastered. This article provides technical insights that can guide the design and development of high-quality hard X-ray Wolter microscopes. © 2024 SPIE.

关键词： Mirrors

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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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infrared small target detection based on spatial attention density peaks searching

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Optoelectronics Letters 2025年第2期21卷 90-96页

作者： RAO Junmin LU Siyu LIU Shijian LI Fanming CAS Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical PhysicsShanghai 200083China University of Chinese Academy of Sciences Beijing 100049China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China

The detection of small targets poses a significant challenge for infrared search and tracking (IRST) systems,as they must strike a delicate balance between accuracy and *** this paper,we propose a detection algorithm based on spatial attention density peaks searching (SADPS) and an adaptive window selection ***,the difference-of-Gaussians (DoG) filter is introduced for preprocessing raw infrared ***,the image is processed by ***,an adaptive window selection scheme is applied to obtain window templates for the target scale ***,the small target feature is used to enhance the target and suppress the ***,the true targets are segmented through a *** experimental results show that compared with the seven state-of-the-art small targets detection baseline algorithms,the proposed method not only has better detection accuracy,but also has reasonable time consumption.

关键词： template searching infrared

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Polarization sensitivity calibration of the non-polarization channel of polarization multiangle imager onboard Fengyun satellite 1

Polarization sensitivity calibration of the non-polarization...

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1st International Conference on Spatial Atmospheric Marine Environmental Optics, SAME 2023

作者： Wang, Haofei Zhang, Peng Yin, Dekui Shang, Jian Hu, Xiuqing Li, Zhengqiang China Meteorological Administration Beijing100081 China Beijing100081 China Key Laboratory of Infrared Detecting and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China State Environment Protection Key Laboratory of Satellite Remote Sensing Aerospace Information Research Institute Chinese Academy of Sciences Beijing100101 China

ISBN: (纸本)9781510666337

The polarization instrument of Fengyun-3 precipitation satellite is the first Polarization and Multi-Angle Imager (PMAI) with short-wave infrared channel in China, aiming to accurately measure the radiation characteristics of clouds and aerosols in the atmosphere. The accuracy of radiometric measurement is an important technical index of instrument performance, which is of great significance for the inversion of high-precision quantitative parameters of satellite remote sensing. For the non-polarization channel of a polarization imager, polarization is a kind of interference information, and the polarization sensitivity of the instrument needs to be inverted and quantitatively removed to improve the accuracy of radiation calibration. A method of least squares fitting response value of complete linear polarization incident light based on different polarization angles is proposed to measure the polarization sensitivity of the non-polarization channel full field of view. According to the measured polarization rate of each channel and the polarization characteristics of the incident light, the polarization sensitivity of each channel is calibrated based on the polarization calibration model. The results show that the polarization sensitivity of the non-polarization channel shows obvious edge effect, gradually increasing from the center of the focal plane to the edge, and has obvious spectral differences, the smaller the wavelength having the higher the polarization sensitivity. The maximum polarization sensitivity occurs in the edge field of view of the non-polarization channel in the 1030nm band, close to 1.6%, which has a great impact on the accuracy of radiometric calibration. After polarization sensitivity calibration, the polarization sensitivity of the edge field of view is within 0.5%. The results show that by calibrating the polarization sensitivity of the full field of view of the non-polarization channel, the radiometric calibration can be effectively improved

关键词： Satellites

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CDP-GAN:Near-infrared and Visible Image Fusion Via Color Distribution Preserved GAN

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IEEE/CAA Journal of Automatica Sinica 2022年第9期9卷 1698-1701页

作者： Jun Chen Kangle Wu Yang Yu Linbo Luo the School of Automation Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex SystemsEngineering Research Center of Intelligent Technology for Geo-ExplorationMinistry of EducationChina University of GeosciencesWuhan 430074China the Shanghai Institute of Technical Physics Key Laboratory of Infrared System Detecting and Imaging TechnologyChinese Academy of SciencesShanghai 200083China the School of Mechanical Engineering and Electronic Information China University of GeosciencesWuhan 430074China

Dear Editor,This letter is concerned with dealing with the great discrepancy between near-infrared(NIR)and visible(VS)image fusion via color distribution preserved generative adversarial network(CDP-GAN).Different from the global discriminator in prior GAN,conflict of preserving NIR details and VS color is resolved by introducing an attention guidance mechanism into the ***。

关键词： details dealing preserving

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Prediction of Pediatric Sepsis Using a Deep Encoding Network with Cross Features

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Journal of Shanghai Jiaotong university(Science) 2024年第1期29卷 131-140页

作者：陈潇张瑞汤心溢钱娟 University of Chinese Academy of Sciences Beijing 100084China Shanghai Institute of Technical Physics of the Chinese Academy of Sciences Key Laboratory of Infrared Detection and Imaging TechnologyShanghai 200083China Shanghai Children's Medical Center Shanghai Jiao Tong University School of MedicineShanghai 200127China

Sepsis poses a serious threat to health of children in pediatric intensive care *** mortality from pediatric sepsis can be effectively reduced through in-time diagnosis and therapeutic *** bacilliculture detection method is too time-consuming to receive timely *** this research,we propose a new framework:a deep encoding network with cross features(CF-DEN)that enables accurate early detection of *** features are automatically constructed via the gradient boosting decision tree and distilled into the deep encoding network(DEN)we *** DEN is aimed at learning sufficiently effective representation from clinical test *** layer of the DEN fltrates the features involved in computation at current layer via attention mechanism and outputs the current prediction which is additive layer by layer to obtain the embedding feature at last *** framework takes the advantage of tree-based method and neural network method to extract effective representation from small clinical dataset and obtain accurate prediction in order to prompt patient to get timely *** evaluate the performance of the framework on the dataset collected from Shanghai Children's Medical *** with common machine learning methods,our method achieves the increase on F1-score by 16.06%on the test set.

关键词： pediatric sepsis gradient boosting decision tree cross feature neural network deep encoding network with cross features(CF-DEN)

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Terahertz 3D detection imaging of ceramic pen holder 11

Terahertz 3D detection imaging of ceramic pen holder

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infrared, Millimeter-Wave, and Terahertz Technologies XI 2024

作者： Zhefeng, Liu Jing, Xu Zhenwei, Zhang Yuejin, Zhao Lingqin, Kong Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Beijing Engineering Research Center of Terahertz and Infrared Technology Beijing Advanced Innovation Center for Imaging Technology and Key Laboratory of Terahertz Optoelectronics Department of Physics Capital Normal University Beijing100048 China

ISBN: (数字)9781510682238

ISBN: (纸本)9781510682221

Based on terahertz frequency modulated continuous wave nondestructive testing system, a ceramic pencil holder was studied. Different types of defects are designed on the outer wall of the ceramic pen holder. By using the high penetration and non-destructive characteristics of terahertz waves, the time domain, height and rotation angle information are obtained by scanning the ceramic pen holder in an all-round and multi-angle manner, and high resolution three-dimensional terahertz images are constructed. At the same time, the processing technology of noise reduction is used to optimize the terahertz images. These images can accurately reveal the tiny defects on the ceramic surface, so as to improve the precision and efficiency of product quality control. Finally, the detection of ceramic pencil holder defects by terahertz frequency modulated continuous wave was realized. © 2024 SPIE.

关键词： Frequency modulation

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Non-Destructive Testing High-Pressure Wall-Penetrating Sleeve Based on Terahertz Frequency Modulated Continuous Wave 11

Non-Destructive Testing High-Pressure Wall-Penetrating Sleev...

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infrared, Millimeter-Wave, and Terahertz Technologies XI 2024

作者： Jing, Xu Zhenwei, Zhang Yuejin, Zhao Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Beijing Engineering Research Center of Terahertz and Infrared Technology Beijing Advanced Innovation Center for Imaging Technology and Key Laboratory of Terahertz Optoelectronics Department of Physics Capital Normal University Beijing100048 China

ISBN: (数字)9781510682238

ISBN: (纸本)9781510682221

Wall penetrating porcelain sleeves are used for power distribution equipment and high-voltage electrical appliances in power stations and substations. They are used for wires to pass through grounding partitions, walls, or electrical equipment casings, supporting conductive parts to insulate them from ground or the casing. The sleeve is composed of porcelain parts, metal accessories, installation flanges, and conductive bars (rods), etc. Due to long-term use, porcelain components may experience cracking, aging, and other phenomena, posing a serious threat to the safe and stable operation of the power system. This article analyzes the defects, material parameters, and thickness of ceramic sleeves using a terahertz frequency modulated continuous wave system. We conducted tests on both standard samples and actual ceramic sleeves. The research results of this article provide a basis for the application of terahertz technology in nondestructive testing of power systems, which can achieve on-site testing of high-voltage ceramic bushings and ensure the safe operation of power systems. © 2024 SPIE.

关键词： Porcelain

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