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Dual-beam photothermal material trace detection method based on self-mixing interference

Applied Optics 2025年第16期64卷 4549-4558页

作者： Zhao, Yan Zhi, Yunlong Zhao, Hui Dong, Daming Tong, Jigang Tu, Chunling School of Electrical Engineering and Automation Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin300384 China National Engineering Research Center for Intelligent Agricultural Equipment Beijing Academy of Agriculture and Forestry Sciences Beijing100097 China Department of Computer Systems Engineering Faculty of ICT Tshwane University of Technology Pretoria0188 South Africa

In this paper, a dual-beam photothermal self-mixing substance trace detection system is proposed. The crystal violet (CV) solution of the sample undergoes a thermal lens effect under the action of pump photoperiod excitation, and the refractive index changes cause the deviation of the probe beam, and the self-mixing interference (SMI) effect occurs when the modulated light returns to the cavity. By combining theoretical and experimental results, the power fluctuation of the SMI signal caused by the thermo-optic effect is linearly related to CV concentration and other parameters. At an excitation power of 24 mW, the detection limit can reach 8.0 × 10−8 mol/L. This method does not require labeling or complex CV pretreatment and has high sensitivity and flexibility, providing a guide for CV characterization in biological, environmental, and pharmaceutical research. © 2025 Optica Publishing Group.

关键词： Gaussian beams Laser beams Optical fields Phase shift Refractive index Spatial resolution

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Optimal control of Fully-Actuated Systems for Spacecraft Rendezvous 41

Optimal Control of Fully-Actuated Systems for Spacecraft Ren...

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第41届中国控制会议

作者： Guang-Quan Duan Guo-Ping Liu Center for Control Theory and Guidance Technology Harbin Institute of Technology Department of Electronic and Electrical Engineering Southern University of Science and Technology

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

In this paper,the rigid spacecraft rendezvous problem is studied in the sense of fully-actuated *** to the attitude and orbit dynamics,the fully-actuated system model is *** the linear quadratic optimal controller of the fully-actuated system is designed for spacecraft rendezvous ***,numerical simulation and physical experiment are *** simulation and experiment results indicate the effectiveness and practicability of the optimal controller.

关键词： Fully-Actuated System Optimal controller Spacecraft Rendezvous Attitude Stabilization Orbit control

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Research on Configuration Optimization of Space Robot for Satellite Capture 16th

Research on Configuration Optimization of Space Robot for Sa...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Fang, Shanxiang Hei, Tuan Department of Mathematics and Theory Peng Cheng Laboratory Shenzhen518055 China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9789819964857

In the satellite capture task of space robot, when the target satellite is in the operational space, the manipulator needs to be adjusted to the capture configuration for successful capture. Based on the demand for comprehensive adaptability of the manipulator during adjustment in complex environments, an average maneuverability index is designed in this paper, which could reflect the comprehensive dexterity of the manipulator during adjustment from the initial state to the capture state, and could be used to select the optimal capture configuration. By numerical simulation, the proposed configuration optimization strategy can make the space robot have the strongest dexterity in the process of adjusting the initial configuration to the capture configuration, so as to improve the success rate of capturing the target satellite by using space robot in complex environment. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Manipulators

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Constrained control of Networked High-Order Fully Actuated Systems via Predictive control 41

Constrained Control of Networked High-Order Fully Actuated S...

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第41届中国控制会议

作者： Da-Wei Zhang Guo-Ping Liu Center for Control Theory and Guidance Technology Harbin Institute of Technology Department of Electronic and Electrical Engineering Southern University of Science and Technology

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

This study is concerned with the output tracking of networked high-order fully actuated(NHOFA) systems subject to input saturation and prescribed performance.A predictive control based constrained control approach is presented to cope with this *** this approach,an incremental HOFA prediction model is constructed via a Diophantine Equation,and then a cost function,considering input saturation and prescribed performance,is optimized by multi-step output prediction,so that an optimal constrained tracking controller is established to satisfy the tracking requirement and given *** analysis presents a simple condition of bounded stability and tracking performance of closed-loop NHOFA systems,which offers a reliable foundation for constrained coordinated control of NHOFA multiagent systems.A numerical simulation of flying-around for air-bearing simulator is shown to prove the feasibility of the proposed approach.

关键词： NHOFA Systems Constrained control Predictive control Bounded Stability and Tracking Performance

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Two-Stage Hierarchical Motion Planning with Basis-Splines in Highway Environments

Two-Stage Hierarchical Motion Planning with Basis-Splines in...

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International Workshop on Advanced Motion control (AMC)

作者： Philip Dorpmüller Torsten Bertram Institute of Control Theory and Systems Engineering TU Dortmund University Dortmund Germany

Road environments can include several local optimal solutions to be explored by a motion planning algorithm, which can be computationally complex. This work proposes a two-stage approach, where each stage solves the same basis-spline parameterized optimal control problem. In the first step, a solution is selected from a discrete set of trajectory candidates. In the second one, the trajectory is refined by a nonlinear optimization algorithm in the continuous solution space. The non-uniform basis-spline parameterization guarantees the trajectory's time-continuous feasibility. Final costs are introduced to ensure convergence towards a final manifold. The approach is evaluated in a highway scenario where other vehicles must be circumnavigated to reach a specified velocity and lane center.

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Research on Sign Language Gesture Division and Gesture Extraction in Complex Background

Research on Sign Language Gesture Division and Gesture Extra...

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2022 International Conference on Computer Vision, Application, and Algorithm, CVAA 2022

作者： Tian, Yifan Han, Fangfang Zhu, Minfeng Xu, Xiaoliang Li, Yadong School of Electrical Engineering and Automation China Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems China

ISBN: (纸本)9781510664036

Sign language plays an important role in information transmission and emotional communication between deaf-mute people and the outside world. With the development of artificial intelligence technology, the recognition, translation and generation of sign language based on digital image processing have attracted worldwide attention. In the field of sign language recognition, effective hand division and gesture extraction are the first and key steps, which directly affect the accuracy of sign language recognition. In this paper, a hand information extraction method based on depth image processing is proposed to solve the problem of sign language gesture extraction in complex background. For sign language speakers,hands are at the front of their bodies, so the depth images of sign language speakers can be collected by depth camera, and the complex background can be removed and hand information can be extracted by segmenting different color objects in the depth images. In this paper, the D435i camera of Inter is used to capture the depth image of the sign language speaker, and the HSV color space model based on the digital image is used for threshold processing of the fusion of hue components and brightness components to achieve the division of the hand position;through median filtering and mathematical morphology of digital image, division noise is removed and interference is reduced. Through skeleton extraction algorithm, the gesture gesture can be obtained. Experiments show that the proposed acquisition scheme and algorithm flow in this paper can effectively realize hand position division and gesture extraction in complex background conditions, and provide a good foundation for subsequent gesture recognition and expression. © 2023 SPIE.

关键词： Morphology

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A Modular Soft Sensor for Centrifugal Pumps

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IFAC-PapersOnLine 2024年第14期58卷 91-96页

作者： Sebastian Leonow Qi Zhang Martin Mönnigmann Automatic Control and Systems Theory Department of Mechanical Engineering Ruhr University Bochum Universitaetsstrasse 150 44801 Bochum Germany

Soft sensors experience an increasing interest in recent years, as they can replace expensive hardware meters and the required embedded computing hardware has become cheap and powerful. We report results for the implementation of a soft sensor for the flow rate estimation in centrifugal pumps that achieves root mean square errors of about 5%. The proposed soft sensor is based on generic models for the drive and hydraulic part of the pump to ensure widespread applicability. We show the soft sensor and the models it is based on can be parametrized with simple measurements. All theoretical considerations are corroborated with measurements on a real industrial pump in a laboratory setup. The results show that the proposed soft sensor is capable of providing reliable flow rate estimates in spite of plant model mismatch and uncertain hardware components.

关键词： Soft Sensor Flow Rate Estimation Centrifugal Pump Variable-Speed Drive

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Broadband Kerr-Raman frequency combs and soliton mode-locking in microrod resonators 11

Broadband Kerr-Raman frequency combs and soliton mode-lockin...

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11th International Symposium on Precision Mechanical Measurements

作者： Jin, Xueying Fang, Qinglin Yu, Liandong Xu, Xin Bi, Yali Xia, Haojie Anhui Province Key Laboratory of Measuring Theory and Precision Instrument School of Instrument Science and Optoelectronics Engineering Hefei University of Technology Hefei230009 China College of Control Science and Engineering China University of Petroleum Qingdao266580 China

ISBN: (纸本)9781510680296

We demonstrate the broadband low-noise Kerr-Raman frequency comb source in an ultrahigh Q microrod resonator, and investigate the mechanisms leading to mode-locked frequency combs. By engineering the interaction between modulation instability and Raman gain, we achieve a wideband Kerr-Raman comb ranging from ∼1480 nm to 1700 nm via Raman-assisted four-wave mixing (FWM). Moreover, we can attain a low-noise mode-locked state through laser detuning control, which experiences three distinct stages required for stabilized comb generation. This platform provides potential for applications in ultrafast ranging systems, stimulated Raman scattering microscopy, and high-precision spectroscopy based on integrated microcombs. © 2024 SPIE.

关键词： Four wave mixing

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Fixed-time position coordinated tracking control for spacecraft formation flying with collision avoidance

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Chinese Journal of Aeronautics 2021年第11期34卷 182-199页

作者： Minglei ZHUANG Liguo TAN Kehang LI Shenmin SONG Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China Research Center of Basic Space Science Harbin Institute of TechnologyHarbin 150001China Science and Technology on Space Intelligent Control Laboratory Beijing Institute of Control EngineeringBeijing 100190China

In this paper,the fixed-time stability of spacecraft formation reconfiguration(position tracking)is ***,a novel nonsingular terminal sliding mode surface is designed and based on which a fixed-time coordinated controller is designed to keep the closed-loop system states have a finite settling time bounded by some predefined ***,another nonsingular terminal sliding mode surface is designed by combining the artificial potential function and the aforementioned sliding surface,which meets the mutual distance constraint during transition process among spacecraft when it is *** another coordinated controller with fixed-time observer considering mutual distance constraint is presented,which guarantees the closed-loop system states stable also in bounded settling ***,simulation results are shown to validate the correctness of the proposed *** is worth mentioning that the control schemes also work even though there is a properly limit on the control input.

关键词： Collision avoidance Disturbance rejection Fixed-time stability Sliding mode control Spacecraft formation flying

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Real-time monitoring and analysis of hydraulic fracturing in surface well using microseismic technology:Case insights and methodological advances

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International Journal of Mining Science and Technology 2025年第4期35卷 619-638页

作者： Yanan Qian Ting Liu Cheng Zhai Hongda Wen Yuebing Zhang Menghao Zheng Hexiang Xu Dongyong Xing Xinke Gan State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou 221116China Yunlong Lake Laboratory of Deep Underground Science and Engineering Xuzhou 221003China Key Laboratory of Theory and Technology on Coal and Rock Dynamic Disaster Prevention and Control National Mine Safety AdministrationChina University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Emergency Management Chengdu UniversityChengdu 610106China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China Xinjiang Yaxin Coalbed Methane 156 Exploration Co. Ltd.Urumqi 841100China

Through a case analysis,this study examines the spatiotemporal evolution of microseismic(MS)events,energy characteristics,volumetric features,and fracture network development in surface well hydraulic fracturing.A total of 349 MS events were analyzed across different fracturing sections,revealing significant heterogeneity in fracture *** scanning results showed that cumulative energy values ranged from 240 to 1060 J across the sections,indicating notable *** reservoir volume(SRV)analysis demonstrated well-developed fracture networks in certain sections,with a total SRV exceeding 1540000 m^(3).The hydraulic fracture network analysis revealed that during the midfracturing stage,the density and spatial extent of MS events significantly increased,indicating rapid fracture propagation and the formation of complex *** the later stage,the number of secondary fractures near fracture edges decreased,and the fracture network *** comparing the branching index,fracture length,width,height,and SRV values across different fracturing sections,Sections No.1 and No.8 showed the best performance,with high MS event densities,extensive fracture networks,and significant energy ***,Sections No.4 and No.5 exhibited sparse MS activity and poor fracture connectivity,indicating suboptimal stimulation effectiveness.

关键词： Hydraulic fracturing Microseismic Source location Energy scanning Fracture network

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