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第八届国际振动工程会议

作者： Zengwei Wang Lei Ding Zhike Peng Xi Shi Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai Institute of Technical Physics Chinese Academy of Sciences State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University

A method is proposed for predicting the dynamic response of mechanical systems subject to combinational structural modifications. It can be found that dynamic responses of mechanical systems subject to combinational structural modifications can be calculated from the variant transmissibility matrices of the one-modification system and the dynamic response of the base system, even though operational forces are unknown. The variant transmissibility is defined to relate the response of the modified system and that of the base system. The dynamic coupling between structural modifications to the system is also investigated. The achievements can be used to reduce the computational cost of determining the optimal combination of design *** benefits of the proposed method are illustrated and validated using the numerical example,finite element simulations and experimental case studies.

关键词： Response prediction for mechanical systems subject to combinationalstructural modifications

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A 3D space-ground atmospheric observation system

A 3D space-ground atmospheric observation system

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Fourier Transform Spectroscopy, FTS 2019

作者： Ren, Chen Cong, Gao Lei, Liu Jianwen, Hua Lei, Ding Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai200083 China University of Chinese Academy of Sciences Beijing100049 China College of Meteorology and Oceanography National University of Defense Technology Nanjing211101 China

This paper introduced a three-dimensional(3D) Space-ground atmospheric observation system, which is based on interference optics technology. It is used to detect the three-dimensional distribution and change of atmosp... 详细信息

ISBN: (纸本)9781943580613

关键词： Atmospheric humidity

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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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[POSTER] ORBFusion: Real-Time and Accurate Dense SLAM at Large Scale

[POSTER] ORBFusion: Real-Time and Accurate Dense SLAM at Lar...

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IEEE International Symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Juting Dai Xinyi Tang Leif Oppermann Key Laboratory of Infrared System Detection and Imaging Technology Fraunhofer Institute for Applied Information Technology FIT University of Chinese Academy of Sciences Shanghai Institute of Technical Physics of The Chinese Academy of Sciences

ISBN: (纸本)9781538614549

We present a new SLAM system capable of producing high quality globally consistent surface reconstructions with accurate real-time tracking and localization abilities. The system works on an off the shelf laptop with a typical GPU. This paper proposes an approach to unify feature-based keyframe techniques with fused volumetric surface reconstruction methods to overcome both of their limitations. On one hand, feature-based keyframe SLAM techniques have reached a level of maturity and can guarantee accurate and real-time tracking and localization ability, but their raw RGB-D point clouds are too noisy. On the other hand, volumetric surface reconstruction methods can produce a dense surface reconstruction of the environment, which will be helpful for Augmented Reality (AR) applications and scene understanding. However, current dense SLAM systems have limited tracking ability, which is vital for the quality of surface reconstruction. Moreover most of the current dense SLAM systems have to run on a powerful desktop PC to guarantee realtime performance. By unifying the feature-based keyframe tracking ability and adopting a multi-threaded design, our system improves both the tracking ability and the real-time performance. We present results of a wide variety of aspects of our system and evaluate it using the widely used TUM RGB-D and ICL-NUIM Datasets. Our system achieves unprecedented performance in terms of trajectory estimation, surface reconstruction, real-time and computational performance in comparison to other start-of-the-art dense RGB-D SLAM systems.

关键词： Augmented reality

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Optical Waveguide Manufactured in Photo-Thermo-Refractive Glass Substrate by Ion Exchange 2

Optical Waveguide Manufactured in Photo-Thermo-Refractive Gl...

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Advanced Optical Manufacturing technologies and Applications 2022, AOMTA 2022 and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2022

作者： Hao, Yinlei Wu, Haoze Guo, Xiao Peng, Xiao Wang, Shiyong Meng, Haoran Liu, Xinyue Chen, Xinyang College of Information Science & Electronic Engineering Zhejiang University Hangzhou310027 China Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai200083 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Shenzhen Institute Zhejiang University Shenzhen518057 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China

ISBN: (纸本)9781510661264

Photo-thermo-refractive (PTR) glasses exhibit promising characteristics for volume Bragg grating fabrication, one of key devices for construction of high performance lasers, among other optical device and systems. Aiming at employing this type of glass materials in the field of integrated photonics, buried optical channel waveguide is manufactured in PTR glass substrate by Ag+/Na+ thermal ion exchange and subsequent field assisted ion migration. The Ag+ doped zone in glass substrate, which is also the waveguide core, can be driven to several micrometers under the glass substrate surface, which decreases the propagation loss to a value as low as 0.12dB/cm, by eliminate scattering loss at glass substrate defects. Cross section of the waveguide core can be also engineered to match the core of single mode fiber, ensures a low coupling loss to single mode fiber. Analysis demonstrated that the buried optical waveguide fabrication proves can be expected to be applied in functional integrated optical device implementation. © 2023 SPIE.

关键词： Ion exchange

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Optical Waveguide in Thermally Developed Photo-Thermo-Refractive Glass Substrate 9

Optical Waveguide in Thermally Developed Photo-Thermo-Refrac...

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9th Symposium on Novel Photoelectronic detection Technology and Applications

作者： Hao, Yinlei Guo, Xiao Peng, Xiao Wu, Haoze Wang, Shiyong Meng, Haoran Liu, Xinyue Chen, Xinyang College of Information Science & Electronic Engineering Zhejiang University Hangzhou310027 China Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai200083 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Shenzhen Institute of Zhejiang University Shenzhen518057 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China

ISBN: (纸本)9781510664432

Photo-thermo-refractive (PTR) glasses are a new category of materials that possess special characteristics of refractive index decrement induced by UV exposure and subsequent thermal development. PTR glasses have been extensively utilized for the fabrication of various volume Bragg grating, and are expected to play an important role in the construction of high-performance guided-wave devices. Investigations on the optical waveguide fabrication process in thermally developed PTR glass Substrate are demonstrated. Optical grade PTR glass of the SiO2-Al2O3-Na2O-ZnO-NaFKBr system and doped with Ce, Ag, Sb, and Sn, is firstly melted, and then glass wafers made of the homemade PTR glass are UV exposed and thermal developed, during which nanometer-sized NaF crystalline is formed in these PTR glass wafers. The thermally developed PTR glass wafers are finally subjected to conventional glass-based optical waveguide melt salt thermal Ag+/Na+ ion exchange and subsequently field-assisted ion diffusion for waveguide fabrication. Results exhibited that buried channel optical waveguide, with Ag+ doped waveguide core dimension of approximately 9.5μm×8.6μm buried 5.2μm under the substrate surface can be obtained by the current procedure. In the current paper, the feasibility of implementing buried waveguide fabrication in thermally developed PTR glass materials is experimentally demonstrated. Since the shape and dimension of the waveguide core is well matched to that of single-mode fiber, and the buried waveguide eliminates scattering loss at the glass substrate surface, the buried optical waveguide is expected to find applications in guided-wave device fabrication. © 2023 SPIE.

关键词： Ion exchange

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detection Algorithm of infrared Dim Small Target Based on FPGA

Detection Algorithm of Infrared Dim Small Target Based on FP...

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Chinese Automation Congress (CAC)

作者： Yingyue Wu Huaicheng Yan Mengling Wang Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai China School of Information Science and Engineering East China University of Science and Technology Shanghai China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

The traditional infrared dim and small target detection algorithm is generally implemented by DSP (Digital Signal Processing) processor, which is complex and has poor real-time performance. In this paper, a FAST (Features from Accelerated Segment Test) algorithm of adaptive threshold based on FPGA (Field Programmable Gate Array) is proposed to detect infrared dim and small target. Based on the characteristics of FPGA parallel processing, the hardware acceleration of algorithm is realized by pipeline design. The improved adaptive threshold method can generate appropriate thresholds according to different environments, and avoid the loss or redundancy of dim and small infrared targets due to improper threshold selection. At last, two different groups of infrared images are used for experiment, the results show that the algorithm can detect the dim and small targets in the infrared image in real time, and can achieve high detection rate and low false alarm rate, which meets the requirements of real-time and effectiveness.

关键词： Signal processing algorithms Real-time systems Information science Field programmable gate arrays Digital signal processing Redundancy Pipelines

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A Low Complexity Lossless Compression Based on General Code Table for infrared Images

SSRN

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SSRN 2024年

作者： Zhu, Yaohua Zhang, Yong Huang, Mingsheng Zhu, Yanghang Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai200083 China Shanghai Institute of Technical Phvsics Chinese Academy of Sciences Shanghai200083 China University of Chinese Academy of Sciences Beijing100049 China

In order to improve the storage and transmission of 14-bit image data acquired by line scanning infrared detectors, this paper proposes a novel method to realize real-time and efficient compression for infrared images. The proposed method utilizes the features of infrared images to reduce image redundancy, then a novel and improved Huffman coding is employed to achieve compression. This paper proposes a method for obtaining a general Huffman code table to increase compression speed and a trimming Huffman tree algorithm to reduce complexity caused by long codes of 14-bit images with low-loss compression ratios. The compression based on general code table avoids counting pixels and uses a simple rule to lookup code table that significantly improves the compression speed. The longest code in the general code table is employed to replace all the long codes in the 14-bit image, enabling low-complexity lossless compression. The proposed method outperforms other commonly used algorithms, which is very suitable for the compression of line scanning panoramic infrared images. The algorithmic idea can be applied not only to 14-bit images, but also to more-bit images. © 2024, The Authors. All rights reserved.

关键词： Trees (mathematics)

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SWIR Fluorescenceimaging In Vivo Monitoring and Evaluating Implanted M2 Macrophages in Skeletal Muscle Regeneration

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Engineering 2024年第2期33卷 283-294页

作者： Mo Chen Yuzhou Chen Sijia Feng Shixian Dong Luyi Sun Huizhu Li Fuchun Chen Nguyen Thi Kim Thanh Yunxia Li Shiyi Chen You Wang Jun Chen Sports Medicine Institute of Fudan University Department of Sports MedicineHuashan HospitalFudan UniversityShanghai 200040China Department of Bone and Joint Surgery Department of OrthopedicsRenji HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai 200127China Department of Anatomy and Physiology School of MedicineShanghai Jiao Tong UniversityShanghai 200025China Key Laboratory of Infrared System Detection&Imaging Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Biophysics Group Department of Physics and AstronomyUniversity College LondonLondon WC1E 6BTUK Healthcare Biomagnetic and Nanomaterials Laboratories University College LondonLondon W1S 4BSUK

Skeletal muscle has a robust regeneration ability that is impaired by severe injury,disease,and *** in a decline in skeletal muscle ***,improving skeletal muscle regeneration is a key challenge in treating skeletal muscle-related *** to their significant role in tissue regeneration,implantation of M2 macrophages(M2MФ)has great potential for improving skeletal muscle ***,we present a short-wave infrared(SWIR)fluorescence imaging technique to obtain more in vivo information for an in-depth evaluation of the skeletal muscle regeneration effect after M2MФ*** fluorescence imaging was employed to track implanted M2MФin the injured skeletal muscle of mouse *** is found that the implanted M2MФaccumulated at the injury site for two ***,SWIR fluorescence imaging of blood vessels showed that M2MФimplantation could improve the relative perfusion ratio on day 5(1.09±0.09 vs 0.85±0.05;p=0.01)and day 9(1.38±0.16 vs 0.95±0.03;p=0.01)post-injury,as well as augment the degree of skeletal muscle regencration on day 13 ***,multiple linear regression analyses determined that post-injury time and relative perfusion ratio could be used as predictive indicators to evaluate skeletal muscle *** results provide more in vivo details about M2MФin skeletal muscle regeneration and confirm that M2MФcould promote angiogenesis and improve the degree of skeletal muscle repair,which will guide the research and development of M2MФimplantation to improve skeletal muscle regeneration.

关键词： In vivo Short-wave infrared Skeletal muscle Macrophage Regeneration

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Accurate vehicle detection and counting algorithm for traffic data collection

Accurate vehicle detection and counting algorithm for traffi...

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International Conference on Connected Vehicles and Expo (ICCVE)

作者： Ye Tian Yangli Wang Rui Song Huansheng Song State Key Laboratory of Integrated Service Networks Xidian University Xi'an P.R. China Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai P.R. China Department of Electronic and Information Engineering Chang'an University Xi'an P.R. China

ISBN: (纸本)9781509002658

Number of vehicles on road is very important traffic data and is essential for transportation safety and management. In this paper, an approach for vehicle detection is presented. In this approach, virtual line based sensors which are just straight detection lines are first set on road lanes. Then two features, namely gradient and range feature, are proposed for vehicle detection. This is carried out by extracting and analyzing the two features on detection lines. Meanwhile, the solution for vehicle occlusion have also been proposed. Our proposed method has an outstanding advantage that it performs excellent in traffic jams as well as under various conditions, such as sunny, cloudy, and rainy days, or night time, or even tunnels with complex illumination. The high accuracy rate of our method is verified with the experiment results.

关键词： Vehicles Feature extraction Vehicle detection Roads Delays Video sequences Connected vehicles

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