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CapUBS: Capsule Network-Based Band Selection for Underwater Hyperspectral Imagery

IEEE Transactions on Geoscience and Remote Sensing 2025年 63卷

作者： Li, Qi Wang, Junwen Zu, Xingyuan Chen, Dan Zhang, Ke Li, Jinghua Northwestern Polytechnical University School of Electronics and Information Xi’an710072 China Xi’an University of Technology School of Automation and Information Engineering Xi’an710048 China Science and Technology on Electromechanical Dynamic Control Laboratory Xi’an China

Underwater hyperspectral imagery (HSI) finds extensive applications in critical domains such as marine target detection. However, spectral offset caused by underwater light propagation presents significant challenges for existing hyperspectral band selection methods, which often fail to capture inter-band correlations in underwater environments effectively. To address this issue, this paper proposes a novel underwater hyperspectral band selection method based on capsule network (CapUBS) designed to mitigate spectral offset variations and reduce redundancy in band selection for underwater HSI. Especially, the dual-stream latent variable encoding module takes the original and averaged spectra as inputs and employs deep feature extraction blocks to capture local details and global semantic features, thereby alleviating spectral variability. The capsule network-based band characterization module utilizes a dynamic routing mechanism to generate digital capsules representing joint multiband features. This module characterizes the multi-dimensional spectral attributes via vector directions and quantifies the relative importance of spectral bands using vector norms. The feature separation factor evaluation module computes the initial band importance ranking to refine the selection process further. It evaluates a feature separation factor to identify key bands with minimal redundancy and high representativeness, resulting in an optimal subset of spectral bands. Finally, the key band feature reconstruction module leverages these selected bands to reconstruct the full-band spectrum accurately. Comprehensive quantitative and qualitative analyses conducted on four classical hyperspectral datasets and underwater hyperspectral experimental datasets demonstrate the superior performance of the proposed method compared to state-of-the-art techniques. © 1980-2012 IEEE.

关键词： Network coding

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Research on Vibration Displacement Measurement of Sleeper Based on Machine Vision 1

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UNIfied Conference of International Workshop on Defence Applications of Multi-Agent Systems, DAMAS 2023, International Conference on Maintenance Engineering, IncoME-V 2023, International conference on the Efficiency and Performance Engineering Network, TEPEN 2023

作者： Chi, Yuliang Gao, Yunpeng Liu, Guiyi Zhang, Chao School of Mechanical Engineering Inner Mongolia University of Science and Technology Baotou014000 China Key Laboratory of Intelligent Diagnosis and Control of Electromechanical Systems in Inner Mongolia Autonomous Region Baotou014000 China Baotou Railway Vocational and Technical College Baotou014000 China

ISBN: (数字)9783031494215

ISBN: (纸本)9783031494208

Machine vision technology has the characteristics of high precision, fast speed, non-contact and high degree of automation in displacement detection. It is feasible to apply machine vision technology to the detection of vibration displacement of railway sleeper. In this paper, the vibration displacement measurement technology of railway sleeper is studied, and a machine vision method based on monocular vision measurement is proposed. According to the geometric relationship between the feature points of the target and the corresponding feature points of the space target in the shot image, the pose information of the space target relative to the camera coordinate system is calculated. By monitoring the change of the attitude of the target rigidly connected to the sleeper, the vibration displacement results of the sleeper when the train passes are obtained. The experimental results show that the proposed method meets the requirements of sleeper vibration measurement in terms of measurement accuracy, sampling comment and stability. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Displacement measurement

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Sea Surface Scattering Characteristics Based on Slope Statistics of Sliding Window

Sea Surface Scattering Characteristics Based on Slope Statis...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Yue Xie Tie Li Bo Tian Tuan Li Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

In view of the insufficient applicability of the current engineer laser short-range sea surface scattering echo related calculation model, it is impossible to effectively evaluate the performance of the system under different conditions, the simulated wave pool environment is used to obtain the detection system at a fixed height and attitude. Data has limitations such as limited sample points and high funding. This paper proposes a sea surface scattering echo model based on three-point sliding window function statistics. By discretizing the sampling of the wave cross section and obtaining the slope statistics under different intersection conditions, the ray tracing method and the slope value are used to determine the effective surface element. The statistical value of the detection probability and the value of the SNR interval under different sea conditions and attitude angles are obtained by simulation, this provides adaptability assessment and related technical index reference for laser short-range sea surface detection.

关键词： Sea surface Laser theory Laser radar Surface waves Power lasers Scattering Surface emitting lasers

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Fabrication of a Pressure Sensor Using 3d Printed Light-Cured Piezoelectric Composites

SSRN

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SSRN 2023年

作者： Wang, Li Ma, Yong Wang, Ke Ma, Yao Lu, Bingheng Niu, Lanjie Li, Xiangyang Micro and Nanotechnology Research Center State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong University Shaanxi Xi'An710049 China Xi'an Institute of Electromechanical Information Technology Xi'An710065 China Science and Technology on Electromechanical Dynamic Control Laboratory China Dongguan University of Technology China

A 0-3 piezoelectric composite material composed of piezoelectric ceramic particles and polymers combines the performance advantages of both components and has broad prospects for applications in piezoelectric pressure sensors, and 3D printing technology provides a good solution for fabricating complex structures of piezoelectric pressure sensors. However, the current research on stereolithography 3D printing for fabricating piezoelectric appliances focuses on the printing of photosensitive piezoelectric composite slurry, and the piezoelectric output of piezoelectric composites prepared with slurry is low due to the low solid content of the slurry, and an inability to stably store the slurry for a prolonged duration. To improve the piezoelectric output performance, this study investigated the material system and structural design of stereolithography 3D printing of piezoelectric composites based on the dispersion stability of the piezoelectric ceramic paste. The results revealed that 72 wt% paste prepared with oleic acid-grafted and modified piezoelectric ceramic particles has good stability, and the piezoelectric voltage constant of the piezoelectric composites fabricated with paste was 220.2 × 10-3Vm‧N-1, and the piezoelectric sensitivity of the piezoelectric composite after topology optimization could reach 30 mV·kPa-1. A conformal pressure sensor prepared using photocuring 3D printing technology can effectively detect the compressive stress of curved surfaces. © 2023, The Authors. All rights reserved.

关键词： Pressure sensors

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Research on a fuze anti-jamming strategy under the background of complex ground objects

Research on a fuze anti-jamming strategy under the backgroun...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Lei Xia Liang Dai Jin–long Zou Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China

ISBN: (纸本)9781665418133

Aiming at the problem of the reduced reliability of the radio proximity fuze under the jamming of complex ground objects,a method of fixed height for laser and radio combined detection is proposed. Using the method of dual-beam separate airspace detection and information fusion,a mathematical model of the fuze's fixed height initiation is established. Through the analysis of the dynamic ground detection model and the ground objects jamming detection model, this design idea and mathematical model against the ground objects jamming effectiveness are confirmed.

关键词： Analytical models Atmospheric modeling Design methodology Measurement by laser beam Reliability theory Reliability engineering Laser modes

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A Method for Reconstructing The Shape of Wing Panels Based on Fiber Optic Sensors and Tomographic Imaging Principles 15

A Method for Reconstructing The Shape of Wing Panels Based o...

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15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Zhan, Jun Zeng, Jie Xiang, Chao Cui, Jinpeng Zeng, Cheng Zhu, Linfeng Lu, Mingyu State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and Astronautics No. 29 Yudao Street Nanjing210016 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft System Jincheng AVIC Nanjing China COMAC Beijing Aircraft Technology Research Institute Changping District Xiaotangshan Future Science and Technology City Beijing102211 China

ISBN: (纸本)9798350354010

The aircraft wing structure shape reconstruction method based on discrete strain information not only provides data support for the digital collaborative health monitoring and prediction technology of wing structure but also helps to improve the aerodynamic shape and flight quality of the aircraft, achieve structural stealth, and enhance the pointing accuracy of the on-board conformal antenna. As result, a wing skin panel shape reconstruction method based on the principle of tomographic imaging and strain information perception is proposed. According to the idea of tomographic imaging, a "non-intrusive" layout form that only requires sensors to be arranged on the periphery of the monitoring area is designed, breaking through the limitation that sensors can not be arranged in the monitoring area under special working conditions. A method for constructing the deflection shape function of the wing skin panel based on the concept of synthetic curvature is proposed, solving the problem of error accumulation and elimination of deformation inversion at non-monitoring points of the measured structure caused by the uncertainty of the limited discrete layout of sensors and the choice of interpolation fitting method. On this basis, a model deformation monitoring and inversion system for wing skin panel based on fiber optic grating sensors is constructed. The experimental results show that under the single-end fixed bending and torsion working condition, the average relative error of the panel model shape reconstruction is 4.17%. Under the double-end fixed double-concentrated load working condition, the average relative error of the shape reconstruction is 8.07%. The wing deformation distribution information reconstructed by the method proposed in this paper can be mapped onto the virtual twin model of the wing, providing technical support for the safety assessment, early warning, and on-condition maintenance of the entire service life of key structures of the aircraft. © 2024

关键词： Fixed wings

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A paper-based self-inductive folding displacement sensor for human respiration and motion signals measurement

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npj Flexible Electronics 2022年第1期6卷 653-663页

作者： Junwen Zhu Yanshen Jia Mengmeng Li Zhanxuan Zhou Yinghao Chen Qiang Liu Xing Yang The State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Electromechanical and Automobile Engineering Yantai UniversityYan Tai 264005China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua UniversityBeijing 100083China

Flexible sensors have recently attracted much attention for potential applications in motion measurement and wearable health *** this paper,an environment-friendly,economic,and high-performance paper-based self-inductive folding displacement sensor(PSIFS)was proposed,with displacement resolution of 20μm and wide measurement range of 43.2 *** sensor sensitivity could reach 4.44%mm^(−1) with the maximum deviation of 0.00904 in *** sensing mechanism based on inductance variation due to three-dimensional deformation of planar inductor coil and structural design principle under two dimensions of sensitivity and size were proposed and *** folding method to enhance sensitivity was proposed and 3 times sensitivity enhancement could be achieved by once *** breathing states and motion states of the human joints could be *** proposed simple paper-based sensor,folding method to increase sensitivity,and structural design model may provide a way for the research of flexible sensors.

关键词： folding inductive motion

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Dual-Band Flexible Terahertz Sensor Based on Rotated Metamaterial Structure

Dual-Band Flexible Terahertz Sensor Based on Rotated Metamat...

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IEEE International Wireless Symposium (IWS)

作者： Dongxu Wang Kai-Da Xu School of Information and Communications Engineering Xi'an Jiaotong University Xi'an China Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai

In this article, a terahertz flexible metamaterial sensor with dual-band operating characteristics is introduced. The gold metamaterial array is arranged on the top surface of a polyimide film, while the structure is made up of a rotated structure with spiral-shaped strips. Two resonances occur at 0.37 and 1.13 THz with outstanding polarization insensitivity. The metamaterial sensor also has sensitive refractive index sensing properties, with sensitivities of 0.1 THz/RIU and 0.3 THz/RIU, respectively, at the two operating bands. This work shows potential applications in refractive index and nesticide sensing.

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Application of Ulaby Model in Simulation of Altimeter Fuze

Application of Ulaby Model in Simulation of Altimeter Fuze

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Sicheng Gao Tie Li Wei Li Bo Tian Science and Technology on Electromechanical Dynamic Control Laboratory Xi'an Shaanxi China

ISBN: (纸本)9781665418133

In order to solve the problem that the application mechanism of scattering information of background of surface features in the design process of altimeter fuze is not clear, a simulation method of altimeter fuze based on Ulaby model is proposed. This method is based on the Ulaby model to model the target characteristics of background of surface features. The target characteristics information is used as the input information of fuze detection in the missile target encounter process, adopting the digital signal processing method. The response characteristic model of fuze target detection is established, and the response simulation of fuze detection to the time-varying scattering characteristics of background of surface features in the process of missile target encounter is carried out, and the response characteristics of echo and IF signal processing are clearly reproduced. The experimental results show that Ulaby model can be used to distinguish different background of surface features types. The target type information is added as another dimensional fuze detection information, and the detection accuracy is further improved by combining the height information.

关键词： Missiles Antenna theory Scattering Object detection Digital signal processing Feature extraction Clutter

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Strong Electromagnetic Protection Circuit for RF Front End of Autodyne Radio Fuze

Strong Electromagnetic Protection Circuit for RF Front End o...

引用

International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Cheng Wang Wei Chen Rui-Hu Wen Science and Technology on Electromechanical Dynamic Control Laboratory China Xi'an Electromechanical Information Technology Research Institute

ISBN: (纸本)9781665418133

In order to solve the problem that the RF front end of autodyne radio fuze is weak in resisting high-power and energy-based jamming, a design method of electromagnetic protection circuit for RF front end is proposed. The method is to add an electromagnetic protection circuit composed of microwave limiter, RF band-pass filter, and single pole double throw switch, which between RF front-end circuit and transceiver antenna of the autodyne radio fuze. The electromagnetic protection of RF front-end core high-frequency devices is carried out by means of excess energy attenuation, selection of passing frequency, and transmission channel locking. Experimental verification shows that the electromagnetic protection circuit can protect the RF front end of the Autodyne radio fuze in both the frequency domain and the time domain, and improve the survivability of the fuze in the high EM environment.

关键词： Radio frequency Microwave antennas Design methodology Microwave theory and techniques Microwave circuits Transceivers Electromagnetics

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