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Letteratura scientifica selezionata sul tema "Converter-Based impedance spectroscopy (IS)"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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Articoli di riviste sul tema "Converter-Based impedance spectroscopy (IS)"

Dam, Shimul Kumar, e Vinod John. "High-Resolution Converter for Battery Impedance Spectroscopy". IEEE Transactions on Industry Applications 54, n. 2 (marzo 2018): 1502–12. http://dx.doi.org/10.1109/tia.2017.2771498.

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Namin, Reyhaneh L., e Shahin J. Ashtiani. "Effect of ADC Resolution on Low-Frequency Electrical Time-Domain Impedance Spectroscopy". Metrology and Measurement Systems 24, n. 2 (27 giugno 2017): 425–36. http://dx.doi.org/10.1515/mms-2017-0019.

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AbstractIn this paper, the effect of the resolution of an analogue-to-digital converter (ADC) on the accuracy of timedomain low-frequency electrical impedance spectroscopy is examined. For the first time, we demonstrated that different wideband stimuli signals used for impedance spectroscopy have different sensitivities to the resolution of ADC used in impedance spectroscopy systems. We also proposed Ramp and Half-Gaussian signals as new wideband stimulating signals for EIS. The effect of ADC resolution was studied for Sinc, Gaussian, Half-Gaussian, and Ramp excitation signals using both simulation and experiments. We found that Ramp and Half-Gaussian signals have the best performance, especially at low frequencies. Based on the results, a wideband electrical impedance spectroscopy circuit was implemented with a high accuracy at frequencies bellow 10 Hz.

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Wang, Ke Ning, Heng Zhao e Wei Wang. "Design of a Bioelectrical Impedance Spectrometer Based on AD5933". Applied Mechanics and Materials 239-240 (dicembre 2012): 392–96. http://dx.doi.org/10.4028/www.scientific.net/amm.239-240.392.

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This paper designed a bioelectrical impedance spectroscopy (BIS) measurement system based on the integrated impedance converter AD5933. The working principle of the AD5933 was briefly introduced, and a bipolar BIS measurement device was designed. The AD5933 can be controlled by MCU STC89LE516AD through an I2C bus. The software of the BIS device was written in C51 language and provides a friendly human-machine interface. Preliminary experiment showed that the impedance measurement error at different frequencies is less than 3% and found that the measurement accuracy is relatively high for larger resistor.

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Dam, Shimul Kumar, e Vinod John. "Battery impedance spectroscopy using bidirectional grid connected converter". Sādhanā 42, n. 8 (4 luglio 2017): 1343–54. http://dx.doi.org/10.1007/s12046-017-0686-9.

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Schmidt, Wolfram, Carsten Tautorat, Klaus-Peter Schmitz, Niels Grabow, Frank Kamke, Sylvia Pfensig e Stefan Siewert. "Multi-channel impedance analyzer for automated testing of networks and biomaterials". Current Directions in Biomedical Engineering 6, n. 3 (1 settembre 2020): 414–17. http://dx.doi.org/10.1515/cdbme-2020-3107.

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AbstractImpedance spectroscopy represents a basic operating principle for biomedical sensors, bioimpedance spectroscopy, electrochemical analyses and for characterization of functional biomaterials. For automated long-term investigations, an impedance analyzer for multi-channel testing of up to eight passive two-pole networks is presented in this paper. Its operating system is application-specific adapted to the required test functionalities and measuring ranges. Measurements are based on a commercially available integrated impedance converter circuit. Our current analyzer setup is capable of measuring impedance values from 50 kΩ up to 10 MΩ with automated range selection for most accurate results. The impedance under test is excited with a single frequency of 1 kHz. An impedance accuracy of 1.5 % was determined in reference measurements. The presented impedance analyzer is a low cost system ready for use particularly in long-term characterization of dielectric networks, such as material properties, with multiple samples.

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Chen, Tse-An, Wen-Jui Wu, Chia-Ling Wei, Robert B. Darling e Bin-Da Liu. "Novel 10-Bit Impedance-to-Digital Converter for Electrochemical Impedance Spectroscopy Measurements". IEEE Transactions on Biomedical Circuits and Systems 11, n. 2 (aprile 2017): 370–79. http://dx.doi.org/10.1109/tbcas.2016.2592511.

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Arceo-Gómez, David Enrique, Javier Reyes-Trujeque, Patricia Balderas-Hernández, Andrés Carmona-Hernández, Araceli Espinoza-Vázquez, Ricardo Galván-Martínez e Ricardo Orozco-Cruz. "Performance and Surface Modification of Cast Iron Corrosion Products by a Green Rust Converter (Mimosa tenuiflora Extract)". Surfaces 7, n. 1 (13 marzo 2024): 143–63. http://dx.doi.org/10.3390/surfaces7010010.

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One of the alternative materials used for conducting conservation treatment of iron artifacts is the rust converter, since it generates barrier properties and more stable oxides. The protective properties and surface modifications from using Mimosa tenuiflora extract as a green rust converter on a gray iron oxide layer were studied. The surface characterization was carried out using a Scanning Electron Microscope coupled to an energy-dispersive X-ray spectrometer (SEM-EDS), along with infrared spectroscopy (IR), Raman spectroscopy, X-ray Diffraction (XRD), and Water Contact Angle (WCA). Electrochemical characterization was performed with an Electrochemical Impedance Spectroscope (EIS) using 3.5 wt.% NaCl as the electrolyte. According to the results of the Raman spectroscopy and XRD, the layer of corrosion products formed after 90 days in the atmosphere was composed of goethite, lepidocrocite, maghemite, hematite, and magnetite. The surface of the corrosion products was transformed with the rust converter into an amorphous and microcracked layer. By IR, the Fe-O and C-O-Fe bonds associated with the iron chelate were found with absorption bands at 1540 and 1567 cm−1, respectively. By XRD, a modification of the magnetite crystallinity was observed. Finally, the Water Contact Angle and the protective capacity of the corrosion products were improved by the presence of the rust converter.

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Shin, Sounghun, Yoontae Jung, Soon-Jae Kweon, Eunseok Lee, Jeong-Ho Park, Jinuk Kim, Hyung-Joun Yoo e Minkyu Je. "Design of Reconfigurable Time-to-Digital Converter Based on Cascaded Time Interpolators for Electrical Impedance Spectroscopy". Sensors 20, n. 7 (29 marzo 2020): 1889. http://dx.doi.org/10.3390/s20071889.

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This paper presents a reconfigurable time-to-digital converter (TDC) used to quantize the phase of the impedance in electrical impedance spectroscopy (EIS). The TDC in the EIS system must handle a wide input-time range for analysis in the low-frequency range and have a high resolution for analysis in the high-frequency range. The proposed TDC adopts a coarse counter to support a wide input-time range and cascaded time interpolators to improve the time resolution in the high-frequency analysis without increasing the counting clock speed. When the same large interpolation factor is adopted, the cascaded time interpolators have shorter measurement time and smaller chip area than a single-stage time interpolator. A reconfigurable time interpolation factor is adopted to maintain the phase resolution with reasonable measurement time. The fabricated TDC has a peak-to-peak phase error of less than 0.72° over the input frequency range from 1 kHz to 512 kHz and the phase error of less than 2.70° when the range is extended to 2.048 MHz, which demonstrates a competitive performance when compared with previously reported designs.

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Li, Wang, Gen Wang Liu e Fu He Yang. "Design of Automatic Measurement System of Lithium Battery Electrochemical Impedance Spectroscopy Based on Microcomputer". Applied Mechanics and Materials 241-244 (dicembre 2012): 259–64. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.259.

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A system of miniaturized lithium battery electrochemical impedance spectroscopy (EIS) measurement is designed with high precision impedance converter chip AD5933 as its core. The measurement range of the system is from 0.010Hz to 100 KHz. Meanwhile, by using a high-level programming language of C#, an interface is developed which can real-time graphic display of EIS information. Through measurement and analysis of two types of impedance, the results show that detection precision of the system is less than 3.5%. Finally, amplitude-frequency response curves and Nyquist plots of HL-18650 M lithium battery at different state of charge (SOC) levels are measured. Compared with lithium battery EIS measurement system by traditional division, this system has the outstanding advantages of small size, high level of integration, low cost, simple operation and high precision. It is helpful to the mass production and application of lithium battery EIS measurement system.

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Wang, Hanqing, Arnaud Gaillard e Daniel Hissel. "A review of DC/DC converter-based electrochemical impedance spectroscopy for fuel cell electric vehicles". Renewable Energy 141 (ottobre 2019): 124–38. http://dx.doi.org/10.1016/j.renene.2019.03.130.

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Più fonti

Tesi sul tema "Converter-Based impedance spectroscopy (IS)"

Wang, Xin. "Online health monitoring of photovoltaic panels by converter-based impedance spectroscopy". Electronic Thesis or Diss., Université de Lorraine, 2024. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2024_0039_WANG.pdf.

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Pour répondre aux besoins énergétiques croissants à travers le monde et dans un objectif de développement durable, l'utilisation de l'énergie solaire entraine une augmentation significative de l'installation de panneaux photovoltaïques (PV) permettant une production d'électricité propre et renouvelable. Cependant, les panneaux PV sont susceptibles de présenter des défauts dus aux menaces environnementales, aux facteurs humains ou à des périodes de fonctionnement prolongées. Ces défauts peuvent entraîner des pertes de puissance, une faible efficacité, une instabilité du système et présenter un risque de sécurité. La surveillance de l'état de santé peut atténuer ces problèmes et améliorer la fiabilité globale et l'efficacité de fonctionnement des panneaux PV. Parmi les outils de surveillance de l'état de santé existants pour les panneaux PV, la spectroscopie d'impédance (IS) offre un moyen puissant et non destructif d'acquérir l'impédance interne des panneaux PV sur une large plage de fréquences. L'IS basée sur le convertisseur peut aider à réduire les coûts globaux du système et à faciliter les applications en ligne, car aucun équipement supplémentaire n'est nécessaire. Cependant, la stratégie de contrôle du convertisseur doit être spécifiquement conçue. Tout d'abord, étant donné que l'injection du signal de perturbation est réalisée en contrôlant les signaux de commutation, la largeur de bande du convertisseur limitera la fréquence maximale du signal de perturbation. Obtenir un spectre IS complet avec une précision suffisante peut donc être un défi. Deuxièmement, pour garantir une puissance de sortie quasi maximale des panneaux PV même pendant la mise en œuvre de l'IS, un schéma de contrôle coopératif entre le suivi du point de puissance maximale (MPPT) et le mode IS doit être envisagé. Une stratégie de contrôle à deux niveaux du convertisseur. Le contrôle de niveau supérieur réalise le contrôle coopératif des différents modes de fonctionnement, notamment les modes MPPT, de suivi du point d'injection et IS. Le contrôle de niveau inférieur comprend le contrôle séparé de chaque mode. En particulier, pour le mode IS, les contrôles en boucle ouverte et en boucle fermée ont été étudiés et comparés systématiquement. Sous le contrôle en boucle ouverte, une analyse de la résonance intrinsèque du convertisseur et de la limitation de fréquence du signal de perturbation est effectuée. De plus, une méthode de configuration adaptative pour l'amplitude du rapport cyclique en courant alternatif est proposée pour éliminer l'influence de la résonance et améliorer la validité et la précision de la mesure IS. Sous le contrôle en boucle fermée, basé sur trois contrôleurs de compensation couramment utilisés en contrôle linéaire de systèmes, deux méthodes de contrôle, appelées contrôle unifié et contrôle séparer, sont conçues et comparées. Dans le contrôle unifié, un seul contrôleur proportionnel-intégral régule les composantes CC et CA ensemble pour atteindre les objectifs de contrôle. Dans le contrôle séparé, un filtre passe-bas segmenté est conçu. Un contrôleur proportionnel et un contrôleur quasi-proportionnel résonant sont ensuite appliqués séparément pour contrôler la composante CA. Basée sur les mesures IS acquises, un AC-ECM simplifié du panneau PV est proposé. Cet AC-ECM offre une approche d'ajustement pour le spectre incomplet obtenu par le biais de l'IS basée sur le convertisseur. De plus, quatre caractéristiques de l'état de santé sont extraites et définies pour surveiller les états de santé du panneau PV dans diverses conditions de fonctionnement. Enfin, une plateforme expérimentale a été développée. Une étude expérimentale a été menée pour vérifier que sous les stratégies peuvent être obtenues. Dans diverses conditions de fonctionnement, l'efficacité de la méthode de surveillance IS en ligne basée sur les caractéristiques extraites du panneau PV est également vérifiée
To meet the world's growing energy needs and with a view to sustainable development, the use of solar energy is leading a significant increase in the installation of photovoltaic (PV) panels, enabling the production of clean and renewable electricity. However, the PV panels are susceptible to faults during operating. These faults can result in power losses, low efficiency, system instability, even pose a risk of security. Health monitoring can mitigate these issues and improve the overall operating reliability and efficiency of PV panels. Among existing health monitoring tools for PV panels, impedance spectroscopy (IS) provides a powerful, non-destructive way to acquire PV panels' internal impedance over a wide frequency range. Compared with specific workstation-based IS, converter-based IS can help reduce overall system costs and facilitate online applications, as no additional equipment is required. However, the control strategy of the power converter needs to be specifically designed. Firstly, the bandwidth of the converter will limit the maximum frequency of the perturbation signal. Obtaining a complete IS spectrum with sufficient accuracy can thus be challenging. Secondly, to ensure a quasi-maximum output power of PV panels even during IS implementation, a cooperative control scheme between maximum power point tracking (MPPT) and IS modes should be considered. The major objectives of this research are twofold: (1) to propose a systematic design guideline for control strategies of converter-based IS implementation; (2) to establish an appropriate AC equivalent circuit model (AC-ECM) for PV panels and extract valuable health indicators for online health monitoring of PV panels. In one aspect, a bi-level control strategy of the power converter including an upper-level and a lower-level control is proposed. The upper-level control achieves the cooperative control of different operating modes, including MPPT, injection point tracking (IPT) and IS modes. The lower-level control includes the separate control of each mode. Particularly, for the IS mode, both open-loop control and closed-loop control have been systematically studied and compared. Under open-loop control, an analysis of the intrinsic resonance of the converter and the frequency limitation of the perturbation signal is performed. Furthermore, an adaptive configuration method for the amplitude of the AC duty cycle is proposed to eliminate the influence of the resonance and enhance the accuracy of IS measurement. Under closed-loop control, based on three commonly used compensation controllers, two control methods, named unified control and separated control, are designed and compared. In the unified control, a single proportional-integral (PI) controller controls the DC and AC components together to meet the control objectives. Meanwhile, in the separated control, a segmented lower pass filter (LPF) with a variable cut-off frequency is designed to effectively separate the DC component of the PV panel current from the AC perturbation signal. A proportional (P) and a quasi-proportional resonant (QPR) are further applied separately to control the AC component. In the other aspect, based on the acquired IS measurements, a simplified AC-ECM of the PV panel is proposed. This AC-ECM offers a fitting approach for the incomplete spectrum obtained through converter-based IS. Additionally, four health features are extracted and defined for monitoring the health states of the PV panel under various operating conditions. Finally, an experimental platform has been developed for online IS implementation. An experimental study has been conducted to verify that under the proposed control strategies, reliable and accurate IS measurements can be achieved. Under various operating conditions, the effectiveness of the online IS monitoring method based on the extracted features of the PV panel is verified as well

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Ocaña, Tejada Cristina. "Aptasensors based on electrochemical impedance spectroscopy". Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/305103.

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En els últims anys, a causa de la necessitat de diàgnostics ràpids i de millores en sensat, s’han utilitzat nous elements de reconeixement en biosensors. Un tipus d’aquests nous elements de reconeixement són els aptàmers. Els aptàmers són cadenes sintètiques de ADN o ARN les quals són seleccionades in vitro i tenen la capacitat d’unir-se a proteïnes, ions, cèl.lules, fàrmacs i lligands de baix pes molecular, reconeixent les seves molècules diana amb alta afinitat i especificitat. Diversos biosensors basats en aptàmers, també anomenats aptasensors, han sigut desenvolupats recentment. D’entre totes les tècniques de transducció utilitzades en biosensors, l’Espectrocòpia Electroquímica d’Impedància ha sigut àmpliament emprada como a eina per caracteritzar la superficies de sensors i estudiar esdeveniments en el biosensat en la superficie d’elèctrodes. La característica més important que presenta aquesta tècnica és que no requereix cap espècie marcada per a la transducció, per tant, aquesta tècnica de detecció pot utilitzar-se per dissenyar protocols de detecció directa sense marcatge, evitant assajos més cars i laboriosos. El principal objectiu d’aquesta tesi doctoral va ser el desenvolupament d’aptasensors utilitzant la tècnica electroquímica d’impedància esmentada anteriorment. Per a això, diferents tipus d’elèctrodes van ser utilitzats, tals com elèctrodes de compòsit grafit-epoxi, elèctrodes de biocompòsit grafit-epoxi modificats amb molècules d’avidina i elèctrodes comercials serigrafiats de nanotubs de carboni de paret múltiple. El treball es va dividir principalmente en dues parts d'acord amb la detecció de dues proteïnes diferents. La primera part es va focalitzar en la detecció de trombina. Primer de tot, es van comparar i avaluar diversos aptasensors de detecció directa sense marcatge basat en diferents tècniques d'immobilització dels aptàmers, tals com: adsorció física humida, afinitat avidina-biotina i enllaç covalent mitjançant activació electroquímica de la superfície de l'elèctrode i mitjançant inserció electroquímica. Posteriorment, els elèctrodes de biocompòsit van ser comparats com a plataformes en genosensat i aptasensat. Amb la finalitat d'amplificar el senyal impedimètric obtingut utilitzant elèctrodes de biocompòsit, un protocol sàndwich va ser emprat incloent nanopartícules d'or modificades amb estreptavidina i tractament amplificador de plata. La segona part de l'estudi es va basar en la detecció de citocrom c. Primerament, es va realitzar un simple aptasensor de detecció directa sense marcatge per a la detecció d'aquesta proteïna utilitzant la tècnica d'immobilització d'adsorció física humida. Finalment, i amb l'objectiu d'amplificar el señal impedimètric, es va desenvolupar un assaig tipus sándwich híbrid d’aptàmer i anticòs utilitzant elèctrodes serigrafiats de nanotubs de carboni de paret múltiple. D'aquesta manera, la tesi explora i compara una àmplia gamma de procediments d'immobilització, l'ús de detecció directa sense marcatge o nanomaterial modificat amb biomolècules en diferents protocols directes o d'amplificació, i l'ús de reconeixement directe i sándwich per amplificar la sensibilitat i/o la selectivitat de l'assaig.
In the recent years, due to the need for rapid diagnosis and improvements in sensing, new recognition elements are employed in biosensors. One kind of these new recognition elements are aptamers. Aptamers are synthetic strands of DNA or RNA which are selected in vitro and have the ability to bind to proteins, ions, whole cells, drugs and low molecular weight ligands recognizing their target with high affinity and specificity. Several aptamer-based biosensors, also called aptasensors, have been recently developed. Among all the transduction techniques employed in biosensors, Electrochemical Impedance Spectroscopy has widely used as a tool for characterizing sensor platforms and for studying biosensing events at the surface of the electrodes. The important feature presented by this technique is that it does not require any labelled species for the transduction; thus, this detection technique can be used for designing label-free protocols thus avoiding more expensive and time-consuming assays. The main aim of this PhD work was the development of aptasensors using the electrochemical impedance technique previously mentioned for protein detection. For that, different types of electrodes were used, such as Graphite Epoxy Composite electrodes (GECs), Avidin Graphite Epoxy Composite electrodes (AvGECs) and commercial Multi-Walled carbon nanotubes screen printed electrodes (MWCNT-SPE). The work was divided in two main parts according to the detection of the two different proteins. The first part was focused on thrombin detection. First of all, different impedimetric label-free aptasensors based on several aptamer immobilization techniques such as wet physical adsorption, avidin-biotin affinity and covalent bond via electrochemical activation of the electrode surface and via electrochemical grafting were developed and evaluated. Then, AvGECs electrodes were compared as a platform for genosensing and aptasensing. With the aim to amplying the obtained impedimetric signal using AvGECs, an aptamer sandwich protocol for thrombin detection was used including streptavidin gold-nanoparticles (Strep-AuNPs) and silver enhancement treatment. The second part of the study was based on cytochrome c detection. Firstly, a simple label-free aptasensor for the detection of this protein using a wet physical adsorption immobilization technique was performed. Finally, with the goal to amplify the impedimetric signal, a hybrid aptamer-antibody sandwich assay using MWCNT-SPE for the detection of the target protein was carried out. In this way, the thesis explores and compares a wide scope of immobilization procedures, the use of label-free or nanocomponent modified biomolecules in different direct or amplified protocols, and the use of direct recognition and sandwich alternatives to enhance sensitivity and/or selectivity of the assay

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Mosunmola, Faloye Omolola. "Design and Implementation of A Three-Level Boost converter for Battery Impedance Spectroscopy". Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32664.

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Lithium-ion batteries are the most are widely used as electrical storage device in various applications such as portable electronics, electric vehicles, Photovoltaic application, telecommunication etc due to the characteristics of the batterie such as high-power density, long cycling and high-power efficiency. Extensive condition monitoring of the battery should be implemented due to the usage of the battery so that there will be an increase in all the overall performance and expectancy. This research is focused on implementing an online condition monitoring on the Li-ion battery using a signal injection through a power converter. The implemented technique in this research is known as the Electrochemical Impedance Spectroscopy (EIS). The EIS is a widely known technique used in determining the internal impedance of a battery cell. The estimated impedance can be used to determine the state of charge (Soc) and State of health (SoH) of a battery. The EIS is used to characterize the electrochemical behaviour thereby monitoring the change in the impedance of the cell of the battery. The EIS technique is accomplished by sinusoidally injecting current at different frequencies and measuring the voltage response. A standard Frequency Response Analyser (FRA) is used as an offline test while the battery is disconnected from the Load. The limitation of this standard FRA analyser is that it is bulky and Expensive. Attempts have been made to migrate the techniques to online operations, each having their own challenges. For an online Implementation, the interfacing power converter is used for Signal injection to measure the impedance of the battery. This work explores the low current ripple advantage of a threelevel boost converter to implement EIS on lithium ion battery.

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Ha, Sungjae. "A malaria diagnostic system based on electric impedance spectroscopy". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/66030.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 69-71).
Malaria caused by Plasmodium falciparum infection is one of the major threats to world health and especially to the community without proper medical care. New approach to cost-efficient, portable, miniaturized diagnostic kit is needed. This work explores electric impedance spectroscopy (EIS) on a microfluidic device as a means of malaria diagnosis. This work introduces a microfabricated probe with microfluidic channel, and a high speed impedance analyzer circuit board. Combination of microfluidic device and circuit board resulted in a small-sized EIS system for micro-particles such as human red blood cell (RBC). After invasion by the parasites, RBC undergoes physiological changes including electrical property of cytoplasm and membrane. Detection of infected RBC is demonstrated as well as differentiation of micro-beads by surface charge density using EIS-based diagnostic system. Diagnosis based on EIS has merits over other diagnostic methods since it is label-free and quantitative test and applicable to whole blood, and also the test does not need bulky optical and electrical equipments.
by Sungjae Ha.
S.M.

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Lagares, Lemos Miguel. "Matlab Based Specific Impedance Spectroscopy Simulator for Suspension of Cells". Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-19348.

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By means of the analytical formula of specific impedance for the spherical cells in suspensionintroduced by Kenneth S. Cole in 1928, a bioimpedance simulator has been developed for thegeneration of specific impedance spectrums of suspension of cells. With the help of the simulatorthe user can obtain different impedance spectrums according with the biophysical parameters ofthe cell suspension. Then, generate different kind of plots in order to understand and interpret allthe resulting information.With the selection of different values and range of the biophysical parameters to obtain thespectrums, it is possible to simulate different kinds of physiological process and observe theirelectrical bioimpedance behaviour in a certain range of frequencies. The performance of thesimulator has been validated simulating Cellular Edema and Haemorrhage has been alsosimulated.

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Guermazi, Mahdi. "In-Vitro Biological Tissue State Monitoring based on Impedance Spectroscopy". Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2016. https://monarch.qucosa.de/id/qucosa%3A20484.

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The relationship between post-mortem state and changes of biological tissue impedance has been investigated to serve as a basis for developing an in-vitro measurement method for monitoring the freshness of meat. The main challenges thereby are the reproducible measurement of the impedance of biological tissues and the classification method of their type and state. In order to realize reproducible tissue bio-impedance measurements, a suitable sensor taking into account the anisotropy of the biological tissue has been developed. It consists of cylindrical penetrating multi electrodes realizing good contacts between electrodes and the tissue. Experimental measurements have been carried out with different tissues and for a long period of time in order to monitor the state degradation with time. Measured results have been evaluated by means of the modified Fricke-Cole-Cole model. Results are reproducible and correspond to the expected behavior due to aging. An appropriate method for feature extraction and classification has been proposed using model parameters as features as input for classification using neural networks and fuzzy logic. A Multilayer Perceptron neural network (MLP) has been proposed for muscle type computing and the age computing and respectively freshness state of the meat. The designed neural network is able to generalize and to correctly classify new testing data with a high performance index of recognition. It reaches successful results of test equal to 100% for 972 created inputs for each muscle. An investigation of the influence of noise on the classification algorithm shows, that the MLP neural network has the ability to correctly classify the noisy testing inputs especially when the parameter noise is less than 0.6%. The success of classification is 100% for the muscles Longissimus Dorsi (LD) of beef, Semi-Membraneous (SM) of beef and Longissimus Dorsi (LD) of veal and 92.3% for the muscle Rectus Abdominis (RA) of veal. Fuzzy logic provides a successful alternative for easy classification. Using the Gaussian membership functions for the muscle type detection and trapezoidal member function for the classifiers related to the freshness detection, fuzzy logic realized an easy method of classification and generalizes correctly the inputs to the corresponding classes with a high level of recognition equal to 100% for meat type detection and with high accuracy for freshness computing equal to 84.62% for the muscle LD beef, 92.31 % for the muscle RA beef, 100 % for the muscle SM veal and 61.54% for the muscle LD veal.
Auf der Basis von Impedanzspektroskopie wurde ein neuartiges in-vitro-Messverfahren zur Überwachung der Frische von biologischem Gewebe entwickelt. Die wichtigsten Herausforderungen stellen dabei die Reproduzierbarkeit der Impedanzmessung und die Klassifizierung der Gewebeart sowie dessen Zustands dar. Für die Reproduzierbarkeit von Impedanzmessungen an biologischen Geweben, wurde ein zylindrischer Multielektrodensensor realisiert, der die 2D-Anisotropie des Gewebes berücksichtigt und einen guten Kontakt zum Gewebe realisiert. Experimentelle Untersuchungen wurden an verschiedenen Geweben über einen längeren Zeitraum durchgeführt und mittels eines modifizierten Fricke-Cole-Cole-Modells analysiert. Die Ergebnisse sind reproduzierbar und entsprechen dem physikalisch-basierten erwarteten Verhalten. Als Merkmale für die Klassifikation wurden die Modellparameter genutzt.

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Yaremyk, R. Ya. "DSP-Based Information-Measuring Microdevice for Electrical Impedance Spectroscopy Analysis". Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47278.

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Guermazi, Mahdi. "In-Vitro Biological Tissue State Monitoring based on Impedance Spectroscopy". Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-206710.

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Abstract (sommario):

The relationship between post-mortem state and changes of biological tissue impedance has been investigated to serve as a basis for developing an in-vitro measurement method for monitoring the freshness of meat. The main challenges thereby are the reproducible measurement of the impedance of biological tissues and the classification method of their type and state. In order to realize reproducible tissue bio-impedance measurements, a suitable sensor taking into account the anisotropy of the biological tissue has been developed. It consists of cylindrical penetrating multi electrodes realizing good contacts between electrodes and the tissue. Experimental measurements have been carried out with different tissues and for a long period of time in order to monitor the state degradation with time. Measured results have been evaluated by means of the modified Fricke-Cole-Cole model. Results are reproducible and correspond to the expected behavior due to aging. An appropriate method for feature extraction and classification has been proposed using model parameters as features as input for classification using neural networks and fuzzy logic. A Multilayer Perceptron neural network (MLP) has been proposed for muscle type computing and the age computing and respectively freshness state of the meat. The designed neural network is able to generalize and to correctly classify new testing data with a high performance index of recognition. It reaches successful results of test equal to 100% for 972 created inputs for each muscle. An investigation of the influence of noise on the classification algorithm shows, that the MLP neural network has the ability to correctly classify the noisy testing inputs especially when the parameter noise is less than 0.6%. The success of classification is 100% for the muscles Longissimus Dorsi (LD) of beef, Semi-Membraneous (SM) of beef and Longissimus Dorsi (LD) of veal and 92.3% for the muscle Rectus Abdominis (RA) of veal. Fuzzy logic provides a successful alternative for easy classification. Using the Gaussian membership functions for the muscle type detection and trapezoidal member function for the classifiers related to the freshness detection, fuzzy logic realized an easy method of classification and generalizes correctly the inputs to the corresponding classes with a high level of recognition equal to 100% for meat type detection and with high accuracy for freshness computing equal to 84.62% for the muscle LD beef, 92.31 % for the muscle RA beef, 100 % for the muscle SM veal and 61.54% for the muscle LD veal
Auf der Basis von Impedanzspektroskopie wurde ein neuartiges in-vitro-Messverfahren zur Überwachung der Frische von biologischem Gewebe entwickelt. Die wichtigsten Herausforderungen stellen dabei die Reproduzierbarkeit der Impedanzmessung und die Klassifizierung der Gewebeart sowie dessen Zustands dar. Für die Reproduzierbarkeit von Impedanzmessungen an biologischen Geweben, wurde ein zylindrischer Multielektrodensensor realisiert, der die 2D-Anisotropie des Gewebes berücksichtigt und einen guten Kontakt zum Gewebe realisiert. Experimentelle Untersuchungen wurden an verschiedenen Geweben über einen längeren Zeitraum durchgeführt und mittels eines modifizierten Fricke-Cole-Cole-Modells analysiert. Die Ergebnisse sind reproduzierbar und entsprechen dem physikalisch-basierten erwarteten Verhalten. Als Merkmale für die Klassifikation wurden die Modellparameter genutzt

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Moore, Sean. "Online condition monitoring of lithium ion batteries by performing impedance spectroscopy using a DC-DC converter". Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29186.

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Li-Ion batteries are currently being used extensively in a variety of applications such as portable electronics, electric vehicles and grid storage applications, due to the high demand for high power and high energy density storage batteries. However, the usage of Li-Ion batteries requires extensive condition monitoring to increase overall performance and life expectancy. This research is focused on implementing rapid online condition monitoring techniques, using signal injection via the associated power converter in the battery management system. The technique implemented in this work is known as Electrochemical Impedance Spectroscopy (EIS). EIS is a well-known technique, that has been used to characterize an electrochemical cell’s behaviour and state by monitoring changes in the cell's impedance. This is accomplished by injecting currents at different frequencies into the battery and measuring the voltage response. This technique is conventionally implemented, using standard Frequency Response Analysers (FRA), while the battery is disconnected from the load (offline) due to the long procedural times involved. This has limited the use of EIS to laboratory testing. In recent years, there has been literature regarding incorporating EIS testing into the battery system, which is done in mainly 2 ways, by including a linear amplifier into the system to inject the current perturbations directly, or by using the existing circuitry in the BMS (typically the DC-DC converter) to inject the current perturbations using various control techniques. Although, these strategies have been applied in literature for online systems, they are still riddled with a lengthy EIS measurement time issue. This work seeks to significantly reduce the associated testing time with the use broadband signals to implement Impedance Spectroscopy for online systems via the associated BMS converter. Broandband Impedance Spectroscopy (BIS) is implemented by injecting a signal with multiple frequencies concurrently as this allows for quicker measurement. The main contribution of this work is the real-time implementation of a multi-sine broadband excitation via a bi-directional converter that can be used in a varying system. The results obtained were compared to results from an industry standard FRA and showed to produce Nyquist plots with a reasonable error.

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Bhatnagar, Purva. "A microcontroller-based Electrochemical Impedance Spectroscopy Platform for Health Monitoring Systems". University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307617.

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Burgot, Jean-Louis. "Techniques Based on Concept of Impedance Impedance Spectroscopy". In General Analytical Chemistry, 110–16. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003224556-18.

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Edwards, Doreen. "Impedance Spectroscopy of Clay-Based Systems". In Whitewares and Materials: Ceramic Engineering and Science Proceedings, Volume 24, Issue 2, 67. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294796.ch8.

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Bhatt, Manoj, Mayank Punetha, Mitesh Upreti, Manoj Singh Adhikari e Sanjay Mathur. "CMOS-based electrochemical impedance sensors". In Impedance Spectroscopy and its Application in Biological Detection, 185–99. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003358091-12.

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Smirnov, Aleksej. "Electrical Characterization of Oxide-Based Materials Using Impedance Spectroscopy". In Oxide-Based Materials and Structures, 31–74. First edition. | Boca Raton : CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429286728-3.

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Katz, Eugenii, e Itamar Willner. "Immunosensors and DNA Sensors Based on Impedance Spectroscopy". In Ultrathin Electrochemical Chemo- and Biosensors, 67–116. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05204-4_4.

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Chugh, Vibhas, Adreeja Basu, Ramesh N. Pudake, Rajkumar Saha e Aviru Kumar Basu. "Recent progress in aptamer-based smart detection techniques for agriculture". In Impedance Spectroscopy and its Application in Biological Detection, 223–44. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003358091-14.

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Bar-On, Lee, Umberto Garlando, Harpreet Singh, Adi Avni, Nir Sade, Yarden Zeron, Danilo Demarchi e Yosi Shacham-Diamand. "Plant-Based Electrical Impedance Spectroscopy for Plant Health Monitoring". In Digital Agriculture, 485–517. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-43548-5_16.

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Jaffrezic-Renault, Nicole. "Label-Free Affinity Biosensors Based on Electrochemical Impedance Spectroscopy". In Neuromethods, 295–318. Totowa, NJ: Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-370-1_14.

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Etayash, Hashem, Thomas Thundat e Kamaljit Kaur. "Bacterial Detection Using Peptide-Based Platform and Impedance Spectroscopy". In Biosensors and Biodetection, 113–24. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6911-1_8.

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Alahi, Md Eshrat E., Xie Li, Subhas Mukhopadhyay e L. Burkitt. "Application of Practical Nitrate Sensor Based on Electrochemical Impedance Spectroscopy". In Sensors for Everyday Life, 109–36. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47322-2_6.

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Atti di convegni sul tema "Converter-Based impedance spectroscopy (IS)"

Abi Nakhoul, Issam Kury, Olivier Francais, Patricia Davidson, Lionel Rousseau, Patrick Poulichet, Stijn Robben, Jordan Roy, Pauline Thiebaud e Ana Rita Ribeiro. "Impedance-Based Spectroscopy System for Monitoring Cell Polarizations on MEA". In 2024 Symposium on Design, Test, Integration and Packaging of MEMS/MOEMS (DTIP), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/dtip62575.2024.10613283.

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Li, Yanqing, Wenhao Li, Yufei Yao, Qiang Li e Tao Han. "Cable Defects Location Method Based on M-sequence with Broadband Impedance Spectroscopy". In 2024 IEEE 5th International Conference on Dielectrics (ICD), 1–4. IEEE, 2024. http://dx.doi.org/10.1109/icd59037.2024.10613176.

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Dam, Shimul Kumar, e Vinod John. "High resolution converter for battery impedance spectroscopy". In 2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES). IEEE, 2016. http://dx.doi.org/10.1109/pedes.2016.7914335.

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Ferrero, R., C. Wu, A. Carboni, S. Toscani, M. De Angelis, H. George-Williams, E. Patelli e P. A. Pegoraro. "Low-Cost Battery Monitoring by Converter-Based Electrochemical Impedance Spectroscopy". In 2017 IEEE International Workshop on Applied Measurements for Power Systems (AMPS). IEEE, 2017. http://dx.doi.org/10.1109/amps.2017.8078334.

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Bautista-Quijano, Jose Roberto, e Olfa Kanoun. "Soft Nanocomposite-Based Pressure Sensors as Smart Seals". In 2021 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2021. http://dx.doi.org/10.1109/iwis54661.2021.9711834.

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Skorina, Erik Howard, Shu Guo, Maqsood Mughal, Cagdas D. Onal e Ahmet C. Sabuncu. "Contact Testing of an Impedance-based Cancer Detection Probe". In 2021 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2021. http://dx.doi.org/10.1109/iwis54661.2021.9711846.

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Wei, Wenzuo, e Juergen F. Kolb. "Impedance Properties of Trabecular Bone Based on Different Analytical Methods". In 2021 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2021. http://dx.doi.org/10.1109/iwis54661.2021.9711811.

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Djemal, Achraf, Dhouha Bouchaala, Ahmed Fakhfakh e Olfa Kanoun. "Epileptic Seizure Motion Classification based on sEMG and Artificial Neural Network". In 2021 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2021. http://dx.doi.org/10.1109/iwis54661.2021.9711793.

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Nasraoui, Salem, Ammar Al-Hamry, Sami Ameur, Mounir Ben Ali e Olfa Kanoun. "Electrochemical Sensor for 4-Aminophenol Based on Flexible Laser Induced Graphene". In 2021 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2021. http://dx.doi.org/10.1109/iwis54661.2021.9711859.

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Misaaoui, Sarra, Ayda Bouhamed, Hamadi Khemakhem e Olfa Kanoun. "Influence of Polar Solvents on Lead Free BCZT Based Flexible Nanogenerators Performance". In 2022 International Workshop on Impedance Spectroscopy (IWIS). IEEE, 2022. http://dx.doi.org/10.1109/iwis57888.2022.9975120.

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Rapporti di organizzazioni sul tema "Converter-Based impedance spectroscopy (IS)"

Hermes, Uwe. Impedance spectroscopy of bilayer lipid membranes and TiO₂ based solar cells. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.7275.

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Bastawros, Ashraf. DTPH56-16H-CAP01 Mechanochemistry-Based Detection of Early Stage Corrosion Degradation of Pipeline Steels. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), maggio 2020. http://dx.doi.org/10.55274/r0011990.

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The aim of the work is to provide measurable precursor signals associated with the initiation stage of near-surface damage and cracking, as depicted in Fig. 1.1. We have identified many salient features during the early stage of the SCC process (Stages 1, 2 on Fig. 1.1), including residual stress build-up, near-surface (within few microns) defect percolation, and changes of dislocation dynamics and measurable changes of the surface osmic resistance. We developed a model-based prediction of the onset and progression of SCC subsurface damage and assessed the electrochemical impedance spectroscopy (EIS) to measure the extent of surface damage. Such a framework would enable the development of appropriate field-deployable NDE technology with the needed spatial and temporal resolutions.

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