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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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Curing analysis of room temperature silicone rubber based on terahertz time-domain spectroscopy system 10

Curing analysis of room temperature silicone rubber based on...

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infrared, Millimeter-Wave, and Terahertz Technologies X 2023

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 Key Laboratory of Terahertz Optoelectronics Department of Physics Capital Normal University Beijing100048 China

ISBN: (纸本)9781510668010

In high-voltage substations, flashover will occur along the surface of wet insulators under bad weather conditions, resulting in pollution flashover accidents of power system, which will seriously threaten the safe and stable operation of power system. Room Temperature Silicone Rubber (RTV), as a new technology and material, has been rapidly developed and widely applied due to its outstanding characteristics such as long lasting and maintenance-free. However, its surface uniformity and defects in the curing process will affect the service life of the coating. In this paper, a terahertz time-domain spectroscopy system was used to analyze the defects, material parameters, thickness, and curing process of RTV coating. Firstly, RTV coating samples with different absences and different thicknesses were produced, and the imaging results of RTV coating prefabrication defects, the optical parameters of cured RTV in the terahertz band and the thickness of the samples were obtained by the terahertz spectroscopy system. In addition, the results of the optical parameters of the RTV material over time (experimental conditions: 20°C, 15%RH) were verified by the experiment over a 3 h period. Different methods were used to extract the optical parameters of the materials for comparison. The results obtained in this paper provide a theoretical model for the application of terahertz time-domain spectroscopy in the nondestructive testing of RTV coating in power systems, and can realize the lifetime analysis of RTV coating. © 2023 SPIE.

关键词： Nondestructive examination

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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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Design of high-reflectivity dynamic switchable metasurface holography

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Optical and Quantum Electronics 2024年第10期56卷 1-13页

作者： Yang, Zehao Wang, Yunfei Zhu, Qiaofen Xi, Sixing Zhang, Lei Hu, Dan Zhang, Yan School of Mathematics and Physics Science and Engineering Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center Hebei International Joint Research Center for Computational Optical Imaging and Intelligent Sensing Hebei University of Engineering Handan056038 China School of Mechanical and Electrical Engineering Chuzhou University Chuzhou239000 China Department of Physics Beijing Key Laboratory of Metamaterials and Devices Key Laboratory of Terahertz Optoelectronics Beijing Advanced Innovation Center for Imaging Theory and Technology Capital Normal University Ministry of Education Beijing100048 China

In the field of holographic imaging, high-reflectivity metasurfaces have become a crucial technology for achieving high efficiency and high-resolution image reconstruction. This study utilizes the dynamic tunability of magnesium (Mg) to numerically design an optical metasurface capable of displaying multiple holographic images in different states, achieving a reflectivity of up to 82%. In its normal state, the metasurface uses the resonance phase modulation of the metallic Mg structure to display images. Upon the introduction of hydrogen, the Mg transitions to its dielectric state, and a separate gold (Au) structure is used to modulate and display different images. The core contribution of this research lies in the application of a high-reflectivity metal layer, which enhances the imaging effects post-magnesium switching and improves the quality of image display. This work provides a new solution for dynamic optical displays and information storage technologies, thereby expanding the application scope of optical metasurfaces. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Holographic displays

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Molecular exchange and passivation at interface afford high-performing perovskite solar cells with efficiency over 24%

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Journal of Energy Chemistry 2023年第7期82卷 219-227,I0005页

作者： Jianjun Sun Wangchao Chen Yingke Ren Yunjuan Niu Zhiqian Yang Li'e Mo Yang Huang Zhaoqian Li Hong Zhang Linhua Hu Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031AnhuiChina School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of TechnologyHefei 230009AnhuiChina College of Science Hebei University of Science and TechnologyShijiazhuang 050018HebeiChina Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center Hebei International Joint Research Center for Computational Optical Imaging and Intelligent SensingSchool of Mathematics and Physics Science and EngineeringHebei University of EngineeringHandan 056038HebeiChina University of Science and Technology of Chin1 Anhui 230026HefeiChina

The interface is crucial for perovskite solar cells(PSCs).However,voids at interfaces induced by the trapped hygroscopic dimethyl sulfoxide(DMSO)can reduce charge extraction and accelerate the film degradation,seriously damaging the efficiency and *** this work,4,4’-dinonyl-2,2’-dipyridine(DN-DP),a Lewis base with long alkyl chains is introduced to solve this *** calculated and experimental results confirm that the dipyridyl group on DN-DP can more strongly coordinate with Pb^(2+)than that of the S=O group on *** strong coordination effect plays a crucial role in removing the DMSO-based adduct and reducing the formation of *** to the electron-donating properties of pyridine,the existence of DN-DP in the perovskite film can passivate the defects and optimize the energy level alignment of the perovskite *** open-circuit voltage(VOC)of the DN-DP-based PSC is improved from 1.107 V(control device)to 1.153 V,giving rise to a power conversion efficiency(PCE)of24.02%.Furthermore,benefiting from the moisture resistance stemming from the hydrophobic nonyl group,the PCE retains 90.4%of the initial performance after 1000 h of storage in the ambient condition.

关键词： Perovskite solar cell Anti-solvent 4 4′-Dinonyl-2 2′-dipyridine Optimized interfaceStability

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Research on the Wirtinger Flow algorithm based on quadratic distribution initial value 1

Research on the Wirtinger Flow algorithm based on quadratic ...

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1st Advanced imaging and Information Processing Conference, AIIP 2023

作者： Xie, Zhenfei Yu, Xuelian Wang, Zhengxian Li, Heng Heilongjiang Provincial Key Laboratory of Quantum Control School of Measurement and Communication Engineering Harbin University of Science and Technology Harbin150080 China Shenzhen Engineering Laboratory of Aerospace Detection and Imaging College of Electronic and Information Engineering Harbin Institute of Technology Shenzhen518055 China

ISBN: (纸本)9781510671904

Phase retrieval algorithms, such as the Wirtinger Flow (WF) algorithm, are widely used in various fields. As a non-convex optimization algorithm for phase retrieval, WF is commonly employed in the reconstruction of holograms in holographic image projection. These types of algorithms typically involve two stages: an initialization stage and an iterative optimization stage. In the initialization stage, an initial value is provided, and a spectral method is used to calculate an approximate solution as the initial guess. The iterative optimization stage then utilizes the Wirtinger gradient to iteratively compute and converge the initial guess to a nearby real solution, thereby obtaining the global optimal solution. However, due to the random nature of the initial values, the computed results often exhibit significant instability. To address this issue, this paper proposes an approach based on a quadratic distribution for improving the stability of the results. In the initialization stage, the initial value is set as the quadratic distribution initial value. Then, the spectral method is applied again to calculate the initial guess. Since the quadratic distribution initial value is artificially assigned, it enhances the stability of the computed results. To validate this method, the paper applies the quadratic distribution initial value to both the initialization stage of the WF algorithm and the Truncated Amplitude Flow (TAF) algorithm. A comparison is made between the results obtained using random initial value and those obtained using the quadratic distribution initial values. The results demonstrate that compared to random initial values, the quadratic distribution initial values can achieve faster and equally accurate computation results with higher stability. Finally, this method is applied to simulation experiments of in-line digital holography, and the reconstruction results from the experiments further confirm the effectiveness of our approach. © 2023 SPIE.

关键词： Convex optimization

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Review of Geostationary Interferometric infrared Sounder

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Chinese Optics Letters 2018年第11期16卷 47-57页

作者： Jianwen Hua Zhanhu Wang Juan Duan Libing Li Chenjun Zhang Xiaowei Wu Qing Fan Ren Chen Xiaojie Sun Lianwei Zhao Qian Guo Lei Ding Liwei Sun Changpei Han Xiangyang Li Nili Wang Haimei Gong Xiaoning Hu Qingjun Liao Dingquan Liu Tianyan Yu Yinong Wu Enguang Liu Zhijiang Zeng Center of Interferometer R＆D Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200082China Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of SciencesShanghai 200082China Third Engineering Department Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200082China infrared Imaging Material and Device Laboratory Chinese Academy of SciencesShanghai 200082China Key Laboratory of Infrared Imaging Materials and Detectors Chinese Academy of SciencesShanghai 200082China Department of Optical Coatings and Materials Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200082China Space Cryocooler System Laboratory Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200082China State Key Laboratory of Transducer Technology Chinese Academy of SciencesShanghai 200082China Corresponding author：wuxiaowei@***

To measure the global atmospheric three-dimensional distribution and change of temperature and humidity is one of the key areas in atmospheric remote sensing detection; it is also a new research and development direction in the field of meteorological satellite application. As a main element of China second generation of geostationary meteorological satellite Fengyun 4 （FY-4）, which was launched on Dec. 11, 2016, the Geostationary Interferometric infrared Sounder （GIIRS） is the first interferometric infrared sounder working on the international geostationary orbit. It is used for vertical atmospheric sounding and gains atmospheric temperature, humidity, and disturbances. The combination of Fourier transform spectrometer technology and infrared detectors makes GIIRS have high spectral resolution and large coverage over spatial areas. With this kind of instrument, meteoro- logical satellites can improve the capabilities for severe weather event monitoring and numerical weather prediction. Here a concise review of the GIIRS development project, including its history, missions and functions, technical design, key technologies, system integration, calibration and in-orbit operation status, etc., is presented.

关键词： Calibration infrared detectors Remote sensing Temperature

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Ultrasensitive and point-of-care detection of plasma phosphorylated tau in Alzheimer’s disease using colorimetric and surface-enhanced Raman scattering dual-readout lateral flow assay

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Nano Research 2023年第5期16卷 7459-7469页

作者： Liding Zhang Ying Su Xiaohan Liang Kai Cao Qingming Luo Haiming Luo Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology(HUST)Wuhan 430074China MoE Key Laboratory for Biomedical Photonics School of Engineering SciencesHuazhong University of Science and TechnologyWuhan 430074China Department of Neurology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Biomedical Engineering of Hainan Province School of Biomedical EngineeringHainan UniversityHaikou 570228China Research Unit of Multimodal Cross Scale Neural Signal Detection and Imaging Chinese Academy of Medical SciencesHUST-Suzhou Institute for BrainsmaticsJiangsu Industrial Technology Research Institute(JITRI)Suzhou 215123China

Phosphorylation of tau at Ser(396,404)(p-tau^(396,404))is one of the earliest phosphorylation events,plasma p-tau^(396,404) level appears to be a potentially promising biomarker of Alzheimer’s disease(AD).The low abundance and easy degradation of p-tau in the plasma make the lateral flow assay(LFA)a suitable choice for point-of-care detection of plasma p-tau^(396,404) ***,based on our screening of a pair of p-tau^(396,404)-specific antibodies,we developed a colorimetric and surface-enhanced Raman scattering(SERS)dual-readout LFA for the rapid,highly sensitive,robust detection of plasma p-tau^(396,404) *** LFA realized a detection limit of 60 pg/mL by the naked eye or 3.8 pg/mL by SERS without cross-reacting with other tau *** importantly,LFA rapidly and accurately differentiated AD patients from healthy controls,suggesting that it has the potential for clinical point-of-care application in AD *** dual-readout LFA has the advantages of simple operation,rapid,ultra-sensitive detection,providing a new way for early AD diagnosis and intervention,especially in primary and community AD screening.

关键词： Alzheimer’s disease p-tau^(396,404) plasma detection surface-enhanced Raman scattering lateral flow assay

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Research on the correlation between the dual diffusion behavior of zinc in InGaAs/InP single-photon avalanche photodiodes and device performance

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红外与毫米波学报 2024年第5期43卷 595-602页

作者： LIU Mao-Fan YU Chun-Lei MA Ying-Jie YU Yi-Zhen YANG Bo TIAN Yu BAO Peng-Fei CAO Jia-Sheng LIU Yi LI Xue Shanghai University Shanghai 201899China State Key Laboratories of Transducer Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Key Laboratory of Infrared Imaging Materials and Detectors Chinese Academy of SciencesShanghai 200083China

The development of InGaAs/InP single-photon avalanche photodiodes(SPADs)necessitates the utiliza-tion of a two-element diffusion technique to achieve accurate manipulation of the multiplication width and the dis-tribution of its electric *** the issue of accurately predicting the depth of diffusion in InGaAs/InP SPAD,simulation analysis and device development were carried out,focusing on the dual diffusion behavior of zinc atoms.A formula of X_(j)=k√t-t_(0)+c to quantitatively predict the diffusion depth is obtained by fitting the simulated twice-diffusion depths based on a two-dimensional(2D)*** 2D impurity morphologies and the one-dimensional impurity profiles for the dual-diffused region are characterized by using scanning electron micros-copy and secondary ion mass spectrometry as a function of the diffusion depth,***/InP SPAD devices with different dual-diffusion conditions are also fabricated,which show breakdown behaviors well consis-tent with the simulated results under the same junction *** dark count rate(DCR)of the device de-creased as the multiplication width increased,as indicated by the *** of 2×10^(6),1×10^(5),4×10^(4),and 2×10^(4) were achieved at temperatures of 300 K,273 K,263 K,and 253 K,respectively,with a bias voltage of 3 V,when the multiplication width was 1.5µ*** results demonstrate an effective prediction route for accu-rately controlling the dual-diffused zinc junction geometry in InP-based planar device processing.

关键词： InGaAs/InP single-photon avalanche photodiode diffusion depth Znic diffusion dark count rate

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A Salient Region detection Model Using Semantic and Color Information

A Salient Region Detection Model Using Semantic and Color In...

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2016 International Conference on Electrical Engineering and Automation（ICEEA2016）

作者： Yun-fei ZHENG Xiong-wei ZHANG Tie-yong CAO Yong-gang HU PLA University of Science and Technology The Officer Academy of Army The Key Laboratory of Polarization Imaging Detection Technology

Due to the lack of object semantic information, existing salient region detection models using visual stimulus cues and prior knowledge are diffcult to detect some complicated salient regions with heterogeneity, low contrast or large scale. We construct a semantic salient region detection network using the fully convolutional structure in this letter. After training effectively, the proposed network can effectively extract the semantic salient regions. Aiming to the defect of inaccurate boundary of the detected semantic salient regions, we further introduce the superpixel segmentation and color appearance model to generate the superpixel-level foreground ***, we propose a new optimization model to fuse the foreground and background probability information and semantic information to derive more accurate salient region map. The experiments comparing with 11 state-of-the-art models demonstrate the effectiveness and robustness of the proposed model.

关键词： Semantic information Fully convolutional network Color appearance model Salient region detection

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