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Multi-pulse parallel demodulation for high-precision measurement in Raman-distributed optical fiber sensing

Journal of Lightwave Technology 2025年第11期43卷 5260-5269页

作者： Xu, Yang Li, Jian Chai, Mingyuan Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan030024 China Taiyuan University of Technology College of Physics Taiyuan030024 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030032 China

Raman distributed temperature sensors enables distributed measurement of temperature along the sensing fiber, which is widely used in production. Due to the limitation of the optical time-domain reflection principle, the temperature measurement accuracy of the sensors will be seriously affected when the length of the temperature variation region is shorter than the pulse width. In this work, the relationship between pulse width, fiber under test (FUT) length and FUT temperature is firstly studied. Then, a multi-pulse parallel demodulation scheme is proposed. The experiments depict that a temperature measurement accuracy is optimized from over 30°C to 1.55 °C with a 0.2 m temperature variation region over 5.6 km. The scheme is based on multi-pulse parallel measurements combined with numerical simulations to achieve equivalent short pulse measurements of the small-region temperature variation without changing the hardware structure of the sensors. This scheme reduces the hardware requirements of the sensors and avoids the problems of sensing distance reduction and signal-to-noise ratio deterioration caused by shortening the pulse width. © 2025 IEEE. All rights reserved.

关键词： Demodulation

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High-spatial-resolution phase-chaos Brillouin optical correlation domain sensor: theoretical analysis and experimental demonstration

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Journal of Lightwave Technology 2025年第12期43卷 5957-5966页

作者： Niu, Lintao Wang, Yahui Tian, Yixiu Ma, Jinglian Zhang, Mingjiang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan030024 China Taiyuan University of Technology College of Physics and Optoelectronic Engineering Taiyuan030024 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030032 China

The predicaments of micro-scale gain motivation and its high signal-to-noise ratio (SNR) extraction primarily restrict the practical measurement of a superior spatial resolution (SR) for stimulated Brillouin scattering sensors. A high-SNR phase-chaos laser Brillouin optical correlation domain analysis (PCL-BOCDA) is introduced to breakthrough the physical bottlenecks. The fundamental principle of gain excitation scale based on PCL linewidth is proposed, and a novel SR evolvement model is constructed. The significant impact of edge effects on SR measurement is thoroughly analyzed, and this approach is theoretically capable of achieving higher SR benefiting from the narrower gain range and feebler accumulation noise. Experiments with different linewidth PCLs are conducted and the results are confirmed to the simulated ones. Ultimately, an SR of 4.8 mm with a relative error of 4.3% is achieved over a 1.14 km sensing distance, representing a tenfold improvement over previous results. This advancement provides a competent approach for high-SR sensors and their application. © 1983-2012 IEEE.

关键词： Stimulated Brillouin scattering

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General Kinetostatic Modeling and Deformation Analysis of a Two-Module Rod-Driven Continuum Robot with Friction Considered

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 110-122页

作者： Peiyi Wang Xinhua Yang Xiangyang Wang Sheng Guo School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518005China

Continuum robots actuated by flexible rods have large potential applications,such as detection and operation tasks in confined environments,since the push and pull actuation of flexible rods withstand tension and compressive force,and increase the structure's *** this paper,a generalized kinetostatics model for multi-module and multi-segment continuum robots considering the effect of friction based on the Cosserat rod theory is ***,the model is applied to a two-module rod-driven continuum robot with winding ropes to analyze its deformation and load *** different in-plane configurations under the external load term as S1,S2,C1,and C2 are *** a bending plane as an example,the tip deformation along thex-axis of these shapes is simulated and compared,which shows that the load capacity of C1 and C2 is generally larger than that of S1 and ***,the deformation experiments and simulations show that the maximum error ratio without external loads relative to the total length is no more than 3%,and it is no more than 4.7%under the external *** established kinetostatics model is proven sufficient to accurately analyze the rod-driven continuum robot with the consideration of internal friction.

关键词： Rod-driven continuum robot Kinetostatic model Cosserat rod theory Deformation and stiffness analysis

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Immunohistochemical Image Segmentation with Improved AGA-Otsu 16

Immunohistochemical Image Segmentation with Improved AGA-Ots...

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16th International Conference on Digital Image Processing, ICDIP 2024

作者： Geng, Junhao Jia, Dongyao Li, Xiuzhu Zhang, Chuanwang Wu, Nengkai Li, Ziqi He, Zihao Institute of Advanced Control System School of Automation and Intelligence Beijing Jiaotong University No.3 Shangyuancun Haidian District Beijing100044 China

ISBN: (数字)9781510682917

ISBN: (纸本)9781510682900

Immunohistochemistry is an essential technique in the quantitative evaluation of tumors, significantly impacting the diagnosis, treatment and prognosis of esophageal cancer. This paper presents a novel method for segmenting immunohistochemical images of esophageal cancer cells, which improves upon the adaptive genetic algorithm and the Otsu algorithm to address issues of inconsistent staining and imprecise segmentation. The method introduces a newly designed threshold discriminant function that takes into account both within-class and between-class variances. Utilizing an enhanced adaptive genetic algorithm, the method efficiently determines the optimal threshold, while an upgraded crossover probability function prevents the algorithm from settling on local optima. The experimental results show that the algorithm can achieve a segmentation accuracy of 95.3%, surpassing the performance of the standard Otsu and genetic algorithms, especially in processing immunohistochemical images with uneven staining. © 2024 SPIE.

关键词： Image segmentation

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Numerical Simulation of the Synergistic Effect of Cavitation and Particle Erosion

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International Journal of Fluid Machinery and systems 2025年第1期18卷 13-26页

作者： Nan, Haozhi Han, Wei Li, Rennian Zhang, Yukun Dong, Yifan College of Energy and Power Engineering Lanzhou University of technology Gansu province Lanzhou730050 China Key Laboratory of Advanced Pumps Valves and Fluid Control System of the Ministry of Education Lanzh ou University of Technology Gansu province 730050 China Jiuquan Institute of Advanced Technology Lanzhou University of Technology China

Cavitation and particle erosion are critical factors affecting the performance and durability of hydraulic machinery. This study employs a combined numerical simulation approach by integrating a cavitation model with a Discrete Phase Model (DPM) erosion model. It examines single erosion and cavitation-erosion synergy under varying cavitation inducer angles. The results show that intensified vorticity behind the inducer increases particle concentration and sliding erosion, leading to higher erosion rates and larger erosion areas compared to the single erosion model. Additionally, a direct correlation is established between cavitation occurrences, particle velocity, vorticity, and erosion rates at different rotational speeds. Comparative analysis with experimental data indicates an 11.52% improvement in predictive accuracy for wear using the cavitation-erosion synergy model. These findings provide valuable insights for predicting wear in hydraulic machinery under cavitation and particle erosion conditions, contributing to enhanced equipment reliability and extended service life. © 2025, Turbomachinery Society of Japan. All rights reserved.

关键词： Cavitation

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Mapping the Behavioral Signatures of Shank3b Mice in Both Sexes

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Neuroscience Bulletin 2024年第9期40卷 1299-1314页

作者： Jingjing Liu Jialin Ye Chunyuan Ji Wenting Ren Youwei He Fuqiang Xu Feng Wang NMPA Key Laboratory for Research and Evaluation of Viral Vector Technology in Cell and Gene Therapy Medicinal Products Shenzhen-Hong Kong Institute of Brain ScienceShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Shenzhen Key Laboratory of Viral Vectors for Biomedicine Translational Research Center for the Nervous SystemShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Key Laboratory of Quality Control Technology for Virus-Based Therapeutics Guangdong Provincial Medical Products AdministrationShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Shenzhen Key Lab of Translational Research for Brain Diseases Translational Research Center for the Nervous SystemShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Guangdong Provincial Key Laboratory of Brain Connectome and Behavior the Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China CAS Key Laboratory of Brain Connectome and Manipulation the Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China University of Chinese Academy of Sciences Beijing100049China

Autism spectrum disorders(ASD)are characterized by social and repetitive *** the ASD mouse model with Shank3b mutations is widely used in ASD research,the behavioral phenotype of this model has not been fully ***,a 3D-motion capture system and linear discriminant analysis were used to comprehensively record and analyze the behavioral patterns of male and female Shank3b mutant *** was found that both sexes replicated the core and accompanied symptoms of ASD,with significant sex ***,Shank3b heterozygous knockout mice exhibited distinct autistic behaviors,that were significantly different from those those observed in the wild type and homozygous knockout *** findings provide evidence for the inclusion of both sexes and experimental approaches to efficiently characterize heterozygous transgenic models,which are more clinically relevant in autistic studies.

关键词： Autism Shank3b Spontaneous behavior 3D animal motion-capture system Computational ethology Sex differences

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Smart Grid Attack Region Partitioning Strategy Based on Node Importance 9

Smart Grid Attack Region Partitioning Strategy Based on Node...

引用

9th IEEE International Conference on Data Science in Cyberspace, DSC 2024

作者： Chen, Zilong Xu, Li Li, Mohan Sun, Yanbin Guangzhou University School of Cyberspace Security Guangzhou China Guangzhou University Cyberspace Institute of Advanced Technology Guangzhou China Guangdong Key Laboratory of Industrial Control System Security Guangzhou China

ISBN: (纸本)9798350391367

With the high degree of integration between physical power grids and information network systems in smart grids, false data injection attacks pose a significant threat to power systems. Traditional reactive power source partitioning methods typically rely on static electrical distances or preset rules, failing to fully consider the dynamic changes in the grid's real-time operational status, resulting in suboptimal partitioning outcomes in dynamic environments. This paper proposes a power grid attack region partitioning strategy based on node importance, using node importance and electrical control distance as partitioning criteria. This approach allows for dynamic adjustments according to the operational status of the power system, ensuring strong coupling within regions and weak coupling between different regions. Finally, we conducted extensive experimental validation in a power system simulation environment. The results demonstrate that this method can effectively reduce attack costs and improve attack success rates, exhibiting good stability and robustness. © 2024 IEEE.

关键词： Power grids

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Time-Varying Formation Tracking control of Heterogeneous Multi-Agent systems With Intermittent Communications and Directed Switching Networks

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IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 294-296页

作者： Yuhan Wang Zhuping Wang Hao Zhang Huaicheng Yan the Shanghai Research Institute for Intelligent Autonomous Systems Tongji University the National Key Laboratory of Autonomous Intelligent Unmanned Systems the Frontiers Science Center for Intelligent Autonomous System of Ministry of Education the College of Electronic and Information Engineering the Department of Control Science and Engineering Tongji University the Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education the School of Information Science and Engineering East China University of Science and Technology

Dear Editor,This letter is concerned with the problem of time-varying formation tracking for heterogeneous multi-agent systems(MASs) under directed switching networks. For this purpose, our first step is to present so... 详细信息

关键词： Switches Topology Observers Formation control Event detection Switched systems Multi-agent systems control theory Autonomous systems Stability

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Chaos Raman distributed optical fiber sensing

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Light(Science & Applications) 2023年第10期12卷 2105-2121页

作者： Chenyi Wang Jian Li Xinxin Zhou Zijia Cheng Lijun Qiao Xiaohui Xue Mingjiang Zhang College of Physics Taiyuan University of TechnologyTaiyuan 030024 ShanxiChina Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024 ShanxiChina College of Electrical Information and Optical Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032 ShanxiChina

The physics principle of pulse flight positioning is the main theoretical bottleneck that restricts the spatial resolution of the existing Raman distributed optical fiber sensing *** to the pulse width of tens of nanoseconds,the spatial resolution of the existing Raman distributed optical fiber sensing scheme with kilometer-level sensing distance is limited to the meter level,which seriously restricts the development of the optical time-domain reflection *** this paper,a chaos laser is proposed in the context of the physical principle of the Raman scattering effect,and a novel theory of chaos Raman distributed optical fiber sensing scheme is *** scheme reveals the characteristics of chaos Raman scattering light excited by a chaotic signal on the sensing ***,the chaos time-domain compression demodulation mechanism between the temperature variation information and chaos correlation peak is ***,the position of the temperature variation signal is precisely located using the delay time of the chaos correlation peak combined with the chaos pulse flight *** on this novel optical sensing mechanism,an experiment with 10 cm spatial resolution and 1.4 km sensing distance was conducted,and the spatial resolution was found to be independent of the sensing *** the limit of the existing spatial resolution theory,the spatial resolution of the proposed scheme is 50 times higher than that of the traditional *** scheme also provides a new research direction for optical chaos and optical fiber sensing.

关键词： fiber optical scattering

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Designing high-Q Fano resonance structures for enhancing fluorescence in all-dielectric metasurfaces

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Optics Letters 2025年第9期50卷 2930-2933页

作者： He, Shuai Wang, Zhiyuan Han, Bin Li, Shan Yao, Zhenyu Guo, Yulong Chen, Zhihui Wang, Yang Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030024 China Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education Institute of Biotechnology Shanxi University Taiyuan030006 China

Highly sensitive fluorescence detection technology is crucial for biological sensing, imaging, and photonic technologies. The fluorescence enhancement effect with the same enhancement factor at multi-wavelengths is important for highly sensitive detection. However, achieving multiwavelength fluorescence enhancement remains challenging. Here, we introduce an all-dielectric metasurface composed of symmetry-broken silicon nanocylinders integrated with graphene, which is designed to significantly enhance and dynamically modulate the fluorescence emission of a single quantum dot. By fine-tuning structural parameters and adjusting the graphene Fermi level, we achieve a tunable high-Q Fano resonance, leading to a nearly 4000-fold fluorescence enhancement. Structural parameter adjustments enable consistent fluorescence enhancement across different wavelengths. Furthermore, at specific wavelengths, fluorescence enhancement can be similarly adjusted. The proposed structure can greatly expand the design strategy of heterogeneous all-dielectric metasurfaces with the same enhancement factor at multi-wavelengths. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Magnetic resonance

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