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SSRN 2024年

作者： Chen, Ying Zhao, Guoting Wang, Zhongyao Shi, Moqing Zhu, Qiguang Hebei Province Key Laboratory of Test/Measurement Technology and Instrument School of Electrical Engineering YanShan University Hebei Qinhuangdao066004 China Hebei Province Key Laboratory of Special Fiber and Fiber Sensor School of Information Science and Engineering Yanshan University Hebei Qinhuangdao066004 China

The bound states in the continuum (BIC) are widely used in designing metamaterials with high quality factor (Q-factor) resonances due to their perfect localization in the continuous spectral range coexisting with expanding waves. In this study, a T-shaped nanohole all-dielectric metasurface structure is proposed based on the unique electromagnetic properties of all-dielectric metasurfaces, and the fundamental reason of its coupled state and the theoretical basis of BIC excitation are deeply investigated based on the theory of group theory, and the geometric symmetry is broken from multiple angles, and the coupling relationship between discrete eigenmodes and the external continuum is specifically analyzed during the change of symmetry, its spectral response and near-field distribution are numerically calculated. In addition, based on the modulation mechanism of the incident light polarization angle, the three-channel resonance with simultaneous tuning of the two resonances and independent tuning of the single resonance is realized under the condition that the resonance position and the Q-factor are not affected. This study not only provides a theoretical basis for the excitation conditions and evolution regularity of symmetry-protected BIC, but also solves the problem in the traditional analysis of resonance phenomena without taking the high Q-factor and stability into account, which can provide new designing methods for optical metasurface devices with multi-channel resonance. © 2024, The Authors. All rights reserved.

关键词： Tuning

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A Low-Power Voltage-Controlled Current Source for Wearable Bioimpedance Applications

A Low-Power Voltage-Controlled Current Source for Wearable B...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Cherif Ouni Bilel Ghoul Hamdi Al-Shaikhli Jumana Ma'touq Ahmed Fakhfakh Olfa Kanoun Measurement and Sensor Technology Faculty of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Centre of Sfax National School of Electronics and Telecommunications of Sfax Sfax Tunisia Department of Biomedical Engineering School of Applied Medical Sciences (SAMS) German Jordanian University Amman Jordan

ISBN: (数字)9798331542726

ISBN: (纸本)9798331542733

Bioimpedance spectroscopy (BIS) has gained prominence as a non-invasive diagnostic tool for characterizing biological tissues, offering critical insights into physiological and pathological conditions. At the core of BIS systems lies the Voltage-Controlled Current Source (VCCS), which is essential for ensuring precise and stable current delivery across varying load conditions. This paper investigates a modified dual Howland configuration with load-in-loop compensation designed for low-power applications. By operating at reduced supply voltages (5V) instead of the conventional ±12V, the proposed design addresses the limitations of existing VCCS circuits in portable and wearable medical devices. The study evaluates the performance of the proposed VCCS circuit in a wide range of frequencies (50 kHz to 1 MHz), load conditions (1000 to 18kO), and input signal types (sine, multi-sine, and sine-sweep). Key findings demonstrate stable current output, efficient power consumption, and robust performance at reduced power levels, making it suitable for bioimpedance applications requiring portable operation.

关键词： Performance evaluation Spectroscopy Pathology Power demand Medical devices Circuits Bioimpedance Physiology Wearable devices Voltage control

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A Robust Convolutional Neural Network for Electrical Impedance Tomography Image Reconstruction

A Robust Convolutional Neural Network for Electrical Impedan...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Mariem Hafsa Kailun Lin Najoua Essoukri Ben Amara Olfa Kanoun Ecole Nationale d'Ingénieurs de Sousse LATIS-Laboratory of Advanced Technology and Intelligent Systems Université de Sousse Sousse Tunisie Professorship of Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany Department of Mechanical Engineering Technische Universität Chemnitz Chemnitz Germany

ISBN: (数字)9798331542726

ISBN: (纸本)9798331542733

Electrical Impedance Tomography (EIT) is a widely used non-invasive imaging method in a variety of application fields. Most EIT applications require an accurate and high-quality reconstructed inner conductivity distribution image. Several solutions have been developed for reliable EIT image reconstruction, but they still suffer from limitations such as low spatial resolution and inconsistency in real measurement scenarios. In this paper, we propose using physically based, extensive simulation data to train a Convolutional Neural Network (CNN) model with 5-fold cross-validation. We generate a set of 10.000 data samples, which builds a comprehensive basis for its training and ensures reliability and generalization capability. The quantitative evaluation demonstrates good reconstruction performance, achieving a Mean Squared Error (MSE) of 0.0151 and an Image Correlation Coefficient (ICC) of 0.97 in the best-performing fold for the simulated data. The method's effectiveness is particularly validated through experimental measurements, where it significantly outperforms traditional Gauss-Newton reconstruction in terms of image sharpness and boundary definition. The algorithm is robust and easily applicable for EIT imaging.

关键词： Training Image quality Electrical impedance tomography Voltage measurement Impedance measurement Imaging Robustness Convolutional neural networks Spatial resolution Image reconstruction

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Uncertainty Budget in the Ldv-Based Radius measurement

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SSRN 2024年

作者： Shi, Shengyu Wu, Yongwei Li, Xiang Yin, Xiaochun Kuschmierz, Robert Czarske, Jürgen National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering Ministry of Education Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing School of Mechanical and Automobile Engineering South China University of Technology Guangzhou510640 China Laboratory for Measurement and Sensor System Techniques Technische Universität Dresden Dresden01069 Germany

Laser Doppler velocimeter (LDV) allows for the measurement of the lateral velocity of a rotating cylindrical workpiece, thus, enabling the absolute radius measurement, showing great application prospect. However, several adverse factors exist that decrease the measurement accuracy, for example, the variation of the fringe spacing, the variation of the rotating frequency, the spindle error motions, and the Doppler frequency estimation, which, unfortunately, have been seldom studied. In this context, this paper comprehensively analyzes the uncertainty in the LDV-based radius measurement. First, we construct an LDV sensor and calibrate its fringe spacing. Then, the LDV-based radius measurement is modeled as an algebraic equation, suggesting that the radius is indirectly measured from several input quantities, including the Doppler frequency, the fringe spacing, and the rotation frequency, each of which owns an input uncertainty, propagating into the measurement result. Ultimately, a detailed budget for the measurement uncertainty is provided. © 2024, The Authors. All rights reserved.

关键词： Laser Doppler velocimeters

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sensory Modulation of Gait Balance in Human Locomotion: A Neuromusculoskeletal Modeling Study

Sensory Modulation of Gait Balance in Human Locomotion: A Ne...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Vahid Firouzi Omid Mohseni Oskar Von Stryk Andre Seyfarth Maziar A. Sharbafi Laufiabor Locomotion Laboratory Centre for Cognitive Science Technische Universität Darmstadt Darmstadt Germany Department of Computer Science Technische Universität Darmstadt Darmstadt Germany Department of Electrical Engineering and Information Technology Measurement and Sensor Technology Group Technische Universität Darmstadt Darmstadt Germany

ISBN: (数字)9798350386523

ISBN: (纸本)9798350386530

Maintaining balance during gait relies on intricate sensorimotor processes, engaging compensatory muscle actions and reflex modulations to counteract external perturbations and prevent falls. This study aims to identify possible muscle reflex parameters that are modulated to maintain balance in the face of external perturbations through neuromechanical simulations. A reflex-based neuromusculoskeletal model is utilized and subjected to four distinct sagittal-plane perturbation types (two whole body linear momentum (WBLM) and two whole body angular momentum (WBAM) applied to the torso at five different timings. Analysis of the correlation between reflex parameters and their impact on perturbation recovery indicates seven key reflex parameters as strong candidates for modulating gait balance. For WBLM perturbations, our findings indicated the contribution of both stance and swing phase strategies by modulating Soleus positive force feedback and Iliopsoas activity. In WBAM perturbations, Vasti positive force feedback emerged as a crucial reflex contributing to knee joint stability in backward torque perturbation. The study suggests leg adjustments as a primary strategy for recovering from forward torque perturbations, achieved by modulating hamstring positive force feedback and increasing Iliopsoas muscle activation during the swing phase. These findings provide new insights into the underlying mechanisms of reflex modulation and its significance in balancing and recovering from perturbations during locomotion.

关键词： Torso Legged locomotion Torque Perturbation methods Force feedback Modulation Muscles Robot sensing systems Stability analysis Timing

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Optimizing Frequency Selection for Cole-Cole Model Parameter Extraction in Bioimpedance Spectroscopy Using CPE

Optimizing Frequency Selection for Cole-Cole Model Parameter...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Cherif Ouni Nour Ammar Ahmed Yahia Kallel John Horstmann Nabil Derbel Ahmed Fakhfakh Olfa Kanoun Measurement and Sensor Technology Faculty of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Centre of Sfax National School of Electronics and Telecommunications of Sfax Sfax Tunisia Control and Energy Management Laboratory National Engineering School of Sfax University of Sfax Sfax Tunisia Chemnitz University of Technology Chemnitz Germany Electronic Devices of Micro and Nano Technique Faculty of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany

ISBN: (数字)9798331507626

ISBN: (纸本)9798331507633

Wearable bioimpedance spectroscopy (BIS) devices are becoming increasingly popular due to their portability and low power consumption. However, improving power efficiency remains a significant challenge. One proposed solution is to reduce the number of excitation frequencies in the stimulation signal. This study investigates how reducing the number of used frequencies affects bioimpedance spectroscopy performance through simulations using synthetic data derived from a Cole-Cole model incorporating a Constant Phase Element (CPE). Simulations were conducted at various noise levels to evaluate how noise impacts the relationship between frequency and impedance. The results indicate a correlation between the number of frequencies used in BIS and the accuracy of CPE parameter extraction. This is particularly evident for $\alpha$ parameters of 0.8 and higher. Conversely, lowering the $\alpha$ value increases errors, even when a higher number of frequencies is used.

关键词： Spectroscopy Accuracy Biological system modeling Noise Bioimpedance Frequency estimation Data models Impedance Parameter extraction Synthetic data

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A Lab-on-Paper Biosensor Using a Two-Step Enzymatic Amplification Strategy for Ultrasensitive Detection of Active Bont/A in Complex Matrices

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SSRN 2024年

作者： Hu, Jingfang Xu, Hua Wu, Jianfeng Shen, Yu Mulchandani, Ashok Gao, Guowei Xie, Jianwei Beijing Key Laboratory of Sensor Beijing Information Science and Technology University Beijing100101 China Laboratory of Toxicant Analysis Academy of Military Medical Sciences Beijing100850 China Department of Chemical and Environmental Engineering University of California RiversideCA92521 United States Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

Botulinum neurotoxin A (BoNT/A), a lethal bacterial enzyme, is the most toxic biotoxin known to humans. Rapid and effective detection of active BoNT/A is highly significant for food safety and medical diagnosis. Herein, a new low-cost, rapid, portable and easy-to-use paper device was proposed and developed to ultrasensitively determine active BoNT/A. Gold nanoparticles (AuNPs)/graphdiyne (GDY) composite materials with high conductivity and good biocompatibility were synthesized on paper-based electrode to improve electrical conductivity and provide a specific recognition interface for SNAP-25 peptide immobilization. A two-step enzymatic amplification strategy was introduced into the sensing interface, which involved the first enzymatic reaction of target-triggered enzymatic cleavage of SNAP-25 peptide and the second enzymatic reaction of alkaline phosphatase (ALP)-induced enzymatic catalysis of silver deposition on AuNPs/GDY, followed by the recognition of BoNT/A via electrochemical stripping analysis of the deposited silver, resulting in an enhanced response and magnified more than 8-fold sensitivity of the biosensor. In addition, a rotary working electrode was designed and integrated into the paper device to avoid cross-contamination on auxiliary electrodes. The proposed lab-on-paper biosensor offers a quantitative detection of active BoNT/A with a linear range of 5～100 pg/mL and a limit of detection (LOD) of 1 pg/mL (S/N=3). As a demonstration, the biosensor was successfully applied to detect the active BoNT/A in various complex matrices, including bottled water, milk, and human serum, without any sample preconcentration or purification, showing great potential for the early diagnosis of active BoNT/A in low-cost, sensitive and reliable point-of-care (POC) devices. © 2024, The Authors. All rights reserved.

关键词： Gold nanoparticles

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Improved Particle Swarm Optimization Algorithm for EIT Image Reconstruction

Improved Particle Swarm Optimization Algorithm for EIT Image...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Oumayma Kahouli Mariem Hafsa Hiba Hellara Imed Eddine Bennour Najoua Essoukri Ben Amara Olfa Kanoun Department of Computer Science National Engineering School of Sousse University of Sousse Sousse Tunisia Laboratory of Advanced Technology and Intelligent Systems National Engineering School of Sousse Laboratory of Measurement and Sensor Technology Technische Universität Chemnitz Chemnitz Germany Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Center of Sfax University of Sfax Tunisia

Electrical Impedance Tomography (EIT) is a clinical imaging technique that gained a lot of attention because it is a non-invasive and radiation-free method. To obtain an inner image of the domain under study, a specific number of electrodes is attached to the surface of the object, then through a pair of electrodes, a low alternative current is injected. Potentials produced by this injection are measured with the remaining electrodes. Based on these boundary voltages measurements, the inner conductivity can be inferred, thus the image is reconstructed. The focus of this paper is to overcome the major weakness of the EIT image reconstruction technique, which is the low spatial resolution of the reconstructed images caused by the non-linearity of EIT inverse problem. This paper considers this problem, an optimization problem that is solved using the Particle Swarm Optimization (PSO) meta-heuristic. A variant of the standard PSO is proposed and validated, first on a circular mesh composed of 686 triangles then on a lung mesh composed of 2707 triangles.

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Cole-Cole Bio-Impedance Parameters Estimation From Sinewave Excitation Signal with a Minimum Number of Frequencies

Cole-Cole Bio-Impedance Parameters Estimation From Sinewave ...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Nour Ammar Cherif Ouni Ahmed Yahia Kallel Hanen Nouri Bilel Ben Atitallah Nabil Derbel Olfa Kanoun Measurement and Sensor Technology Faculty of Electrical Engineering and Information Technology Chemnitz University of Technology Chemnitz Germany Control and Energy Management Laboratory National Engineering School of Sfax University of Sfax Sfax Tunisia Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Centre of Sfax National School of Electronics and Telecommunications of Sfax Technopole of Sfax Ons City Tunisia

Cole-Cole impedance model is widely used in electrical bioimpedance measurements to characterize biological tissues. Accurate estimation of the Cole-Cole impedance parameters is crucial in bioimpedance measurements to obtain reliable results. Many studies have proposed approaches to estimate the Cole-Cole impedance parameters with high accuracy and minimal error. However, there is still a need to investigate the minimum number and positions of frequencies required to accurately estimate the Cole-Cole impedance parameters and, thus, efficiently reconstruct the impedance spectrum. This paper proposes a novel approach to reconstruct Cole-Cole bioimpedance parameters using a minimum number of frequencies. The study utilizes an IV method-based system implemented on an STM32 platform to perform impedance measurements. The results obtained from this system are compared with those obtained from a commercial impedance analyzer, Agilent 4294A, in the frequency range of 1 kHz to 1 MHz. After applying nonlinear least squares fitting, the results of two and three impedance measurement frequencies showed that selecting certain positions significantly affects the accuracy. Using three frequencies, including the extreme points and an additional point in the high-frequency range, gave better results with 0.56%. The results described here may be useful in other implementations of impedance spectroscopy.

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Enhanced sensing telemetry using reconstruction of divergent exceptional points with cross-coupling

Enhanced sensing telemetry using reconstruction of divergent...

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IEEE International Wireless Symposium (IWS)

作者： Baolong Jian Zhilu Ye Minye Yang Ming Liu Key Laboratory of the Ministry of Education Engineering Research Center of Spin Quantum Sensor Chips State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research Laboratory Universities of Shaanxi Province School of Electronic Science and Engineering Xi’an Jiaotong University Xi’an China International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi'an Key Laboratory for Biomedical Testing and High-end Equipment State Key Laboratory for Manufacturing Systems Engineering The Key Laboratory of Biomedical Information Engineering of Ministry of Education Center for Mitochondrial Biology and Medicine School of Life Science and Technology Xi'an Jiaotong University Xi'an P.R. China

ISBN: (数字)9798350389999

ISBN: (纸本)9798350390001

We herein introduce a new wireless sensing telemetry with enhanced sensitivity by leveraging the reconstruction of divergent exceptional point (DEP) in a cross-coupled third-order parity-time (PT)-symmetric electronic system. We confirm that with the presence of cross-coupling between the gain and loss components, which was ignored in the previous work, the phenomenon of DEP can still exist. In addition, we theoretically provide the design strategy for building such a system and explicit guidance for reconstructing the DEP. We also demonstrate that such a reconstruction procedure of the cross-coupled DEP can indeed be utilized as the sensing mechanism having unprecedented sensitivity. This work may provide a comprehensive understanding of the DEP benefits of the practical implementation of DEP sensors.

关键词： Wireless communication Wireless sensor networks Sensitivity Buildings sensors Telemetry Electromagnetics Oscillators Next generation networking

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