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Breaking demodulation limitations:AWG and Deep Learning in Dynamic Spectral Reconstruction for Differential FBG Accelerometers

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IEEE Sensors Journal 2025年第11期25卷 19210-19222页

作者： Yang, Qian Liu, Lei Niu, Ning Quan, ChenYi Ren, SuFen Chen, ShengChao Zhang, JiaLin Yan, YuMeng Xiang, LongTeng Wang, YiPing Liao, ChangRui He, Jun Wang, GuanJun School of Information and Communication Engineering Hainan University College of Electronic Science and Technology China Henan Mechanical and Electrical Vocational College School of Electrical Engineering Henan451100 China Hainan University College of Electronic Science and Technology School of Information and Communication Engineering Haikou570228 China University of Technology Sydney School of Computer Science Faculty of Engineering and Information Technology SydneyNSW Australia Hainan University College of Electronic Science and Technology Haikou570228 China Shenzhen University School of Physics and Optoelectronic Engineering Shenzhen518060 China

Conventional fiber Bragg grating (FBG) accelerometer demodulation often suffers from high environmental sensitivity, complexity, and cost. To address these issues, this paper presents two arrayed waveguide grating (AWG)-based dynamic spectral reconstruction models. First, a novel differential FBG accelerometer with an equal-intensity triangular cantilever beam and a symmetric string-like design enhances sensitivity and mitigates temperature interference. A power ratio-nonlinear logarithmic regression (PR-NLR) model derived from static calibration then enables spectral reconstruction and wavelength demodulation across varying accelerations, achieving 4-82pm accuracy, slightly below that of high-speed demodulators (HSD). Next, by integrating convolutional neural networks (CNN), bidirectional long short-term memory (BiLSTM), attention mechanisms, and a generative adversarial network (GAN) for data augmentation, prediction errors drop to 1-26pm at 20Hz and 0.2-21pm at 40Hz-a reduction of at least 60% over PR-NLR. This outcome underscores the advantages of deep learning (DL) in managing complex spectral shifts. By overcoming frequency-only demodulation limits, the proposed AWG approach achieves precise wavelength demodulation through dynamic spectral reconstruction. Its compact design, low manufacturing cost, and robust performance facilitate scalable deployment in structural health monitoring, particularly for bridge vibration analysis and industrial machinery diagnostics. © 2001-2012 IEEE.

关键词： Arrayed waveguide gratings

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Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas

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Chinese physics Letters 2024年第5期41卷 47-52页

作者：石鹏庄革程芝峰高丽周乙楠刘永罗景庭李景春 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Engineering and Applied Physics School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Nuclear and Radiation Safety Institute for Advanced Study in Nuclear Energy&SafetyCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 510640China

Quasi-coherent micro-instabilities is one of the key topics of magnetic confinement fusion. This work focuses on the quasi-coherent spectra of ion temperature gradient(ITG) and trapped-electron-mode instabilities using newly developed far-forward collective scattering measurements within ohmic plasmas in the J-TEXT *** ITG mode is characterized by frequencies ranging from 30 to 100 k Hz and wavenumbers(k_(θρs)) less than 0.3. Beyond a critical plasma density threshold, the ITG mode undergoes a bifurcation, which is marked by a reduction in frequency and an enhancement in amplitude. Concurrently, enhancements in ion energy loss and degradation in confinement are observed. This ground-breaking discovery represents the first instance of direct experimental evidence that establishes a clear link between ITG instability and ion thermal transport.

关键词： ITG mode collective

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Superconductivity in Cubic La_(3)Al with Interstitial Anionic Electrons

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Chinese physics Letters 2025年第2期42卷 88-97页

作者： Zhijun Tu Peihan Sun Donghan Jia Huiyang Gou Kai Liu Hechang Lei School of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials&MicroNano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceHebei University of Science and TechnologyShijiazhuang 050018China Center for High Pressure Science and Technology Advanced Research Beijing 100193China

We observed superconductivity in a cubic La_(3)Al single crystal that exhibits metallic behavior in the normal state without an observable structural transition and enters the superconducting state below T_(c)~6.32 *** characterization and analysis indicate that cubic La_(3)Al is a bulk type-Ⅱ BCS ***,theoretical calculations show that it can host interstitial anionic electrons located at the body center of the cubic unit cell,which confirms electron-phonon coupling as the superconducting ***,cubic La_(3)Al can be considered as a novel electride superconductor.

关键词： mechanism cubic

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Enhanced Coupling of Superconductivity and Evolution of the Gap Structure in CsV_(3)Sb_(5)via Ta Doping

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Chinese physics Letters 2024年第12期41卷 121-128页

作者： Yiwen Li Zhengyan Zhu Qing Li Yongze Ye Zhiwei Wang Yugui Yao Hai-Hu Wen National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of EducationSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China Micronano Center Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic SystemsBeijing Institute of TechnologyBeijing 100081China Material Science Center Yangtze Delta Region Academy of Beijing Institute of TechnologyJiaxing 314011China

In this study,Kagome superconductors,i.e.,CsV_(3)Sb_(5)single crystals and its Ta-doped variant,Cs(V_(0.86)Ta_(0.14))_(3)Sb_(5),were studied in detail via specific heat *** revealed that the charge density wave(CDW)was suppressed and the superconducting transition temperature(Tc)considerably increased from 2.8 to 4.6K upon Ta *** electronic specific heat of CsV_(3)Sb_(5)was fitted with a model comprising an s-wave gap and a highly anisotropic extended s-wave gap,where 2Δ/kBTc was smaller than the weak coupling limit of ***(V_(0.86)Ta_(0.14))_(3)Sb_(5) exhibited two isotropic s-wave gaps and yielded a larger gap of 2Δ/kBTc=5.04,indicating a significant enhancement in superconducting *** evolution was attributed to the increased density of states near the Fermi level released by CDW gap *** findings demonstrated that Ta doping enhanced superconducting coupling and variation of gap structure in CsV_(3)Sb_(5).

关键词： doping coupling fitted

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Topological materials for full-vector elastic waves

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National science Review 2023年第5期10卷 194-200页

作者： Ying Wu Jiuyang Lu Xueqin Huang Yating Yang Li Luo Linyun Yang Feng Li Weiyin Deng Zhengyou Liu School of Physics and Optoelectronics and State Key Laboratory of Luminescent Materials and Devices South China University of Technology Institute of Solid Mechanics Midea Corporate Research CenterMidea Group Department of Astronautic Science and Mechanics Harbin Institute of Technology Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE)School of PhysicsBeijing Institute of Technology Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan University Institute for Advanced Studies Wuhan University

Elastic wave manipulation is important in a wide variety of applications,including information processing in small elastic devices and noise control in large solid *** recent emergence of topological materials has opened new avenues for modulating elastic waves in ***,because of the full-vector feature and the complicated couplings of the longitudinal and transverse components of elastic waves,manipulating elastic waves is generally difficult compared with manipulating acoustic waves(scalar waves) and electromagnetic waves(vectorial waves but transverse only).To date,topological materials,including insulators and semimetals,have been used for acoustic and electromagnetic *** topological materials with elastic waves have also been reported,the observed topological edge modes lie on the domain wall.A natural question arises:Is there an elastic metamaterial with topological edge modes on its own boundary?Here,we report a 3D metal-printed bilayer metamaterial that topologically insulates elastic *** introducing chiral interlayer couplings,the spin-orbit couplings for elastic waves are induced,which give rise to nontrivial topological *** edge states with vortex features were demonstrated on the boundary of the single topological *** further show a heterostructure of the metamaterial that exhibits tunable edge *** findings could be used in devices based on elastic waves in solids.

关键词： topological insulators elastic waves edge states

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From surface loading to precise confinement of polyoxometalates for electrochemical energy storage

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Chinese Chemical Letters 2023年第12期34卷 29-41页

作者： Chongji Wang Yanhui Song Wenhua Cong Yuanyuan Yan Meiling Wang Jiadong Zhou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Instituteof TechnologyBeijing100081China Instrumental Analysis Center Taiyuan University of TechnologyTaiyuan 030024China

Because of abundant redox activity,broad tunability,and specific atomic structure,polyoxometalates(POMs or POM)clusters have attracted burgeoning interests in electrochemical especially energy stor-age ***,due to the high solubility and fully oxidized state,they often suffer from elec-trically insulation as well as chemical and electrochemical *** noncovalent loading or covalent grafting of POMs on conductive substrates have been successfully performed to overcome this ***,severe shedding or agglomeration of POMs arising from weak interactions with substrates or excessive entrapment or weak destruction in conductive supports cause significantly re-duced availability and *** this end,precise confinement of POMs into conductive supports has been tried to improve their dispersibility and ***,recent progress of PoMs from surface loading to precise confinement in the electrochemistry energy storage field is ***,we il-lustrate the typical non-confinement methods(*** and non-covalent)for supported POMs in energy storage ***,different strategies for precise confinement of PoMs in organic and inorganic materials for related applications are also ***,future research directions and opportunities for confined POMs,and derived ultrafine nanostructures are also *** re-view seeks to point out future research directions of supported PoMs in the electrochemistry-related fields.

关键词： Polyoxometalates Non-confinement Confinement Electrochemical energy storage Supercapacitor Battery

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Magnetoresistance hysteresis in the superconducting state of kagome CsV_(3)Sb_(5)

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Chinese physics B 2024年第10期33卷 30-34页

作者： Tian Le Jinjin Liu Zhiwei Wang Xiao Lin Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China Key Laboratory for Quantum Materials of Zhejiang Province Department of PhysicsSchool of Science and Research Center for Industries of the FutureWestlake UniversityHangzhou 310030China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Material Science Center Yangtze Delta Region Academy of Beijing Institute of TechnologyJiaxing 314011China

The hysteresis of magnetoresistance observed in superconductors is of great interest due to its potential connectionwith unconventional *** this study,we perform electrical transport measurements on kagome superconductorCsV_(3)Sb_(5)nanoflakes and uncover unusual hysteretic behavior of magnetoresistance in the superconducting *** hysteresis can be induced by applying either a large DC or AC current at temperatures(T)well below the superconductingtransition temperature(T_(c)).As T approaches T_(c),similar weak hysteresis is also detected by applying a *** scenarios are discussed,with particular focus on the effects of vortex pinning and the presence of timereversal-symmtery-breaking superconducting *** findings support the latter,hinting at chiral superconductivityin kagome superconductors.

关键词： hysteresis magnetoresistance kagome superconductor chiral superconductor

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Defects in monolayer WS2 grown via sulfurization of WSe2

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Progress in Natural science:Materials International 2024年第2期34卷 323-328页

作者： Shunhui Zhang Xiang Lan Hang Liu Xuyang Zhang Baihui Zhang Zhikang Ao Tian Zhang Peng Chen Xiangdong Yang Fangping Ouyang Zhengwei Zhang Hunan Key Laboratory of Nanophotonics and Devices School of Physics Central South University College of Materials Science and Engineering Hunan University Physical Sciences and Engineering Division King Abdullah University of Science and Technology School of Energy and Power Engineering Changsha University of Science and Technology School of Flexible Electronics (Future Technologies) Institute of Advanced Materials Jiangsu National Synergetic Innovation Centre for Advanced Materials Nanjing Tech University School of Microelectronics Southern University of Science and Technology Institute of Micro/Nano Materials and Devices Ningbo University of Technology

The conversion of chalcogen atoms into other types of chalcogen atoms in transition metal dichalcogenides exhibits significant advantages in tuning the bandgaps and constructing lateral ***,despite atomic defects at the atomic scale were inevitably formed during conversion process,the construction of dislocations remains ***,we conducted in-situ sulfurization to achieve structural transformation from monolayer WSe2to *** probe these transformations at atomic scale using high-angle annular dark field scanning transmission electron microscopy（HAADF-STEM） and study structural defects of sulfurizedWS2by strain and displacement *** discovered that high-quality WSe2flakes were completely sulfurized while dislocations were successfully constructed,manifesting atomic surface roughness and structural *** work provides insights into designing and optimizing customized Transition metal dichalcogenides（TMDs）materials in controlled synthesis and defect engineering.

关键词： Tungsten disulfide Tungsten diselenide Sulfurization Dislocations Strain and displacement fields

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Enhancing electrochemical capacity and interfacial stability of lithium-ion batteries through side reaction modulation with ultrathin carbon nanotube film and optimized lithium cobalt oxide particle size

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Nano Research 2024年第8期17卷 7230-7241页

作者： Wei Xi Xiaogang Xia Jiacheng Zhu Dehua Yang Sishen Xie Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Advanced Passivation Technology Lab College of Physics Science and TechnologyHebei UniversityBaoding 071002China

Lithium cobalt oxide(LCO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and ***,its application has been limited by relatively low capacity and stability at high *** particle size is considered one of the most straightforward and effective strategies to enhance ion transfer,thus increasing the rate ***,side reactions are simultaneously enhanced as the specific surface area ***,we investigate the impact of LCO particles with varying size distributions and optimize the particle *** modulate the side reactions associated with particle size reduction,an ultrathin carbon nanotube film(UCNF)is introduced to coat the cathode *** this simple process and optimized particle size,the rate performance improves significantly,normal commercial LCO achieves 118 mA·h·g^(−1)at 3.0–4.3 V and 20 C(0.72 mA·h·cm^(−2)),corresponding to power density of 8732 W·kg^(−1).This method is applied to high voltage as well,152 mA·h·g^(−1)at 3.0–4.6 V and 20 C(0.99 mA·h·cm^(−2))was achieved with high-voltage LCO(HVLCO),corresponding to power density of 11,552 W·kg^(−1).The cycling stability is also enhanced,with the capacity retention maintaining more than 96%after 100 cycles at 0.1 *** the first time,UCNF is demonstrated to suppress the excessive decomposition of the electrolytes and solvents by blocking electron injection/extraction between LCO and electrolyte *** findings provide a simple method for improving LCO rate performance,especially at high C-rates.

关键词： lithium-ion batteries lithium cobalt oxides carbon nanomaterials side reactions

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Excitonic Instability in Ta_(2)Pd_(3)Te_(5) Monolayer

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Chinese physics Letters 2024年第9期41卷 57-62页

作者： Jingyu Yao Haohao Sheng Ruihan Zhang Rongtian Pang Jin-Jian Zhou Quansheng Wu Hongming Weng Xi Dai Zhong Fang Zhijun Wang Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Department of Physics Hong Kong University of Science and TechnologyHong Kong 999077China

By systematic theoretical calculations,we reveal an excitonic insulator(EI)in the Ta_(2)Pd_(3)Te_(5)*** bulk Ta_(2)Pd_(3)Te_(5)is a van der Waals(vdW)layered compound,whereas the vdW layer can be obtained through exfoliation or molecular-beam ***-principles calculations show that the monolayer is a nearly zero-gap semiconductor with the modified Becke–Johnson *** to the same symmetry of the band-edge states,the two-dimensional polarization 2D would be finite as the band gap goes to zero,allowing for an EI state in the *** the first-principles many-body perturbation theory,the GW plus Bethe–Salpeter equation calculation reveals that the exciton binding energy is larger than the single-particle band gap,indicating the excitonic *** computed phonon spectrum suggests that the monolayer is dynamically stable without lattice *** findings suggest that the Ta_(2)Pd_(3)Te_(5) monolayer is an excitonic insulator without structural distortion.

关键词： monolayer principles calculations

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