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Добірка наукової літератури з теми "Impedance metrology"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Impedance metrology"

1

Agustoni, Marco, and Frederic Overney. "Impedance Metrology: Bridging the LF–RF Gap." IEEE Transactions on Instrumentation and Measurement 70 (2021): 1–8. http://dx.doi.org/10.1109/tim.2020.3036062.

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2

Overney, Frédéric, Nathan E. Flowers-Jacobs, Blaise Jeanneret, Alain Rüfenacht, Anna E. Fox, Paul D. Dresselhaus, and Samuel P. Benz. "Dual Josephson impedance bridge: towards a universal bridge for impedance metrology." Metrologia 57, no. 6 (October 22, 2020): 065014. http://dx.doi.org/10.1088/1681-7575/ab948d.

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3

Rouane, Amar, and Paul Bru. "High frequency metrology for intracardiac ablation: in-vivo results." Metrology and Measurement Systems 19, no. 3 (October 1, 2012): 603–10. http://dx.doi.org/10.2478/v10178-012-0053-4.

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Abstract Cardiac Radiofrequency (RF) ablation is a commonly used clinical procedure for treating many cardiac arrhythmias. However, the efficacy of RF ablation may be limited by two factors: small ventricular lesions and impedance rise, leading to coagulum formation and desiccation of tissue. In this paper, a high frequency (HF) energy ablation system operating at 27.12 MHz based on an automated load matching system was developed. A HF energy matched probe associated to the automated impedance matching device ensures optimal transfer of the energy to the load. The aim of this study was to evaluate this energy for catheter ablation of the atrioventricular junction. In vivo studies were performed using 10 sheep to characterize the lesions created with the impedance matching system. No cardiac perforation was noted. No thrombus was observed at the catheter tip. Acute lesions ranged from 3 to 45 mm in diameter (mean ±SD = 10.3±10) and from 1 to 15 mm in depth (6.7±3.9), exhibiting a close relationship between HF delivered power level and lesion size. Catheter ablation using HF current is feasible and appears effective in producing a stable AV block when applied at the AV junction and large myocardial lesions at ventricular sites.
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4

Callegaro, Luca, Francesca Durbiano, Elena Orru, and Bruno Trinchera. "An Impedance Spectrometer for the Metrology of Electrolytic Conductivity." IEEE Transactions on Instrumentation and Measurement 62, no. 6 (June 2013): 1766–70. http://dx.doi.org/10.1109/tim.2012.2230731.

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5

Gonzalez-Raya, Tasio, and Mikel Sanz. "Coplanar Antenna Design for Microwave Entangled Signals Propagating in Open Air." Quantum 6 (August 23, 2022): 783. http://dx.doi.org/10.22331/q-2022-08-23-783.

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Open-air microwave quantum communication and metrology protocols must be able to transfer quantum resources from a cryostat, where they are created, to an environment dominated by thermal noise. Indeed, the states carrying such quantum resources are generated in a cryostat characterized by a temperature Tin≃50 mK and an intrinsic impedance Zin=50Ω. Then, an antenna-like device is required to transfer them with minimal losses into open air, characterized by an intrinsic impedance of Zout=377Ω and a temperature Tout≃300 K. This device accomplishes a smooth impedance matching between the cryostat and the open air. Here, we study the transmission of two-mode squeezed thermal states, developing a technique to design the optimal shape of a coplanar antenna to preserve the entanglement. Based on a numerical optimization procedure, we find the optimal shape of the impedance, and we propose a functional ansatz to qualitatively describe this shape. Additionally, this study reveals that the reflectivity of the antenna is very sensitive to this shape, so that small changes dramatically affect the outcoming entanglement, which could have been a limitation in previous experiments employing commercial antennae. This work is relevant in the fields of microwave quantum sensing and quantum metrology with special application to the development of the quantum radar, as well as any open-air microwave quantum communication protocol.
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6

Callegaro, Luca. "The metrology of electrical impedance at high frequency: a review." Measurement Science and Technology 20, no. 2 (December 17, 2008): 022002. http://dx.doi.org/10.1088/0957-0233/20/2/022002.

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7

Musioł, Krzysztof. "Experimental Study of Digitizers Used in High-Precision Impedance Measurements." Energies 15, no. 11 (May 31, 2022): 4051. http://dx.doi.org/10.3390/en15114051.

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In the currently used primary impedance measuring systems, there is a need to compare standards with ratios different from 1:1, e.g., in order to transfer the value to multiples or submultiples of the basic quantity. Unfortunately, the commercial PXI sampling systems used to measure the voltage ratio in the impedance bridge, although they provide adequate resolution, show a considerable non-linearity of the measurement. This leads to significant error of the impedance ratio measurement. Experimental studies of commercial PXI digitizers used in primary impedance metrology are presented in the paper. The scope of the work includes presentation of the sampling measurement system hardware used in electronic synchronous impedance bridges and studies of the parameters that affect the applicability of PXI digitizers in high-precision measuring instruments. Nonlinearity errors of digitizers on boards NI PXI-4461 and NI PXI-4462 were measured and appropriate conclusions regarding possible corrections of the errors were drawn.
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8

Deleebeeck, Lisa, and Sune Veltzé. "Electrochemical impedance spectroscopy study of commercial Li‐ion phosphate batteries: A metrology perspective." International Journal of Energy Research 44, no. 9 (April 15, 2020): 7158–82. http://dx.doi.org/10.1002/er.5350.

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9

Amoah, Papa K., Christopher E. Sunday, Chukwudi Okoro, Jungjoon Ahn, Lin You, Dmitry Veksler, Joseph Kopanski, and Yaw Obeng. "(Invited) Towards the Physical Reliability of 3D-Integrated Systems: Broadband Dielectric Spectroscopic (BDS) Studies of Material Evolution and Reliability in Integrated Systems." ECS Meeting Abstracts MA2022-02, no. 17 (October 9, 2022): 859. http://dx.doi.org/10.1149/ma2022-0217859mtgabs.

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Анотація:
In this talk, we present an overview of our current research focus in developing non-destructive metrology for monitoring reliability issues in 3D-integrated electronic systems. Working closely with the semiconductor industry, we have been looking at various performance limiting phenomena in 3D-interconnects, the associated dielectrics, and advanced packaging for integrated circuits. The talk will identify some common reliability concerns, and identify some metrology gaps, for 3-D integrated systems. We will introduce a suite of microwave-based Broadband Dielectric Spectroscopic (BDS) techniques and show how these non-destructive metrologies can serve as early warning monitors for reliability issues. These techniques are based on the application of high frequency microwaves, to probe impedance changes due to material and structural changes in integrated circuits under various external stress. For example, we will also discuss the combination of BDS with scanning probe infrastructure to create the Scanning Microwave Microscopy (SMM) technique, which has been used to detect buried artifacts and characterize metallic contacts. We further illustrate the capabilities of the BDS-based techniques with case studies of three potential reliability issues in 3D IC. We conclude with a forward look at the future metrology and standards needs 3-D interconnects and the associated advanced packaging.
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Inglis, Barry D. "Arthur Melville Thompson 1917–2009." Historical Records of Australian Science 25, no. 2 (2014): 306. http://dx.doi.org/10.1071/hr14020.

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Arthur Melville (‘Mel') Thompson graduated from the University of Adelaide in 1938 with First Class Honours in Physics. After graduation he joined Australia's Council for Scientific and Industrial Research as one of the ‘founding fathers' of the National Standards Laboratory and embarked on a life-time career in metrology. His work in precision electrical measurement, ratio-arms transformer bridges and techniques for defining and measuring small capacitances is internationally renowned. He conceived the design of a calculable-capacitor, the Thompson-Lampard capacitor, which led to a new theorem in electrostatics and provided the basis for an absolute determination of the unit of resistance with an increase in accuracy of an order of magnitude. Beyond the calculable capacitor his work had a major impact in electrical impedance measurement in general and on other fields of metrology such as dilatometry and thermometry. Mel Thompson was an inspirational leader and his work facilitated the development of many scientific careers.
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Більше джерел

Дисертації з теми "Impedance metrology"

1

TRAN, NGOC THANH MAI. "Novel techniques for electrical impedance metrology." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2910078.

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2

POURDANESH, FARANAK. "Digital and build-up techniques for electrical impedance metrology." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2705547.

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This dissertation presents my activity on electrical impedance metrology carried out during my PhD. The dissertation is structured in five main chapters. After a short Introduction briefly describing the research activities, the three central chapters are as follows. My work on the development of digital impedance bridges is described in chapter 2, where I present the implementation of two different digital bridges and some test measurements. The first bridge implemented is a fully digital impedance bridge with a very simple architecture, which is based on a commercial two-channel digital signal synthesizer and a synchronous detector. The bridge can perform comparisons between the impedances having arbitrary phase and magnitude ratio. The bridge balance is achieved automatically. R-C and C-C comparisons with calibrated standards, at kilohertz frequencies and 100 kΩ magnitude level performed to give ratio errors of the order of 10−6 to 10−5. The second implementation is that of a three-arm current comparator impedance bridge which allows one to perform comparisons among three unlike impedances. The main aim of this digital bridge is the calibration of impedances having arbitrary phase angles against calibrated pure impedances. The analyses of the bridge setting and of its operation are presented. To test the bridge, the measurements of an air-core inductor and of an RC network versus decadic resistance and capacitance standards, at kilohertz frequency, are performed. The bridge measurements are compatible with previous knowledge of the standard values with relative deviations of parts in 10−5. In chapter 3, I describe a capacitance build-up technique for the calibration of the nonlinearity of a capacitance meter. The method is implemented with a new design matrix formulation. Two different applications of this method are vii also described. In the first case, the method is applied to the determination of the nonlinearity of an Agilent mod. E4980A precision LCR meter in the range from 1 nF to 10 nF. The results obtained in this case are then compared with measurements performed with a high-accuracy capacitance meter, an Andeen-Hagerling mod. 2500A, whose readings give the reference values. The second experiment is that of a capacitance transfer from 1 nF to 100 pF as a step in the realization of a capacitance scale. The capacitance ratio C(1nF)/C(100pF) obtained with the capacitance build-up method is then compared with the ratio obtained from the Italian national capacitance scale. The uncertainty of the capacitance build-up technique obtained at the 10−6 level. After two chapters dedicated to primary metrology, chapter 4 concentrates on the application of impedance measurements to neuroscience. The shrinking size of microelectrodes leads to high electrode-tissue interfacial impedance and inaccurate measurement when recording the data from the tissue. In order to achieve safe and efficient electrode performances, a porous and rough electrodeposition material to modify the bare microelectrodes is proposed. Combining the advantages of platinum (Pt) with iridium (Ir), gives a microelectrode with low resistance and high capacitance. These new microelectrodes were tested in two different applications. In the first one, fiber carbon microelectrodes with electrodeposited Pt-Ir were fabricated and implanted in the tissue of a rat to record brain signals. In the second application, Pt-Ir nano-wires were electrodeposited on a polymide test substrate. The fabrication process is explained and the optical and SEM images were taken to analyze the roughness of the microelectrode surface. Furthermore, it demonstrated superior mechanical and electrochemical stability of these coating nano-wires on the microelectrode. Morphological tests showed that Pt provided large area and hence good adhesion for dense Ir deposition, which was beneficial for long-term mechanical stability of the composite coating. Finally, the conclusion sums up the results and outlines possible future developments.
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3

MARZANO, MARTINA. "Novel devices and methods for quantum resistance and impedance metrology." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2779393.

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4

Sindjui, Ralph. "Réalisation et caractérisation de dispositifs de mesure associés à la détermination de la constante de von Klitzing à partir d’un condensateur calculable étalon dit de Thompson-Lampard." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLV053/document.

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Le sujet de thèse s'inscrit dans le cadre d'un nouveau projet de détermination de la constante de von Klitzing débuté depuis quelques années au LNE et dont l'aboutissement est prévu pour 2018. A ce jour, la mesure la plus exacte de cette constante traçable au Système International d’unités (SI) est obtenue via le raccordement de l'ohm produit par l'effet Hall quantique au farad, matérialisé à l'aide d'un condensateur calculable dit de Thompson-Lampard. Afin d'améliorer sa précédente détermination délivrée en 2000 avec une incertitude relative de 5.10-8,le LNE a décidé de construire un nouvel étalon calculable de Thompson-Lampard (déjà en cours de développement) et d'améliorer l'exactitude de l'ensemble des dispositifs de mesure associés avec pour objectif de réduire l’incertitude globale sur cette détermination à une valeur proche de 10-8. Le travail de thèse porte sur la réalisation, la caractérisation et/ou l’automatisation de la chaîne de mesure associée à cette détermination
The comparison of electrical quantities expressed in units of the International System of Units (SI) and the same quantities generated from quantum effects is a direct way of determining physical constants. The determination of the von Klitzing constant (quantum of resistance) from a calculable capacitor is a part of this process. The last determination of this constant was conducted at LNE in 2000 with an uncertainty of 5.10-8. To achieve a target uncertainty of 1.10-8, the LNE decided to build a new standard capacitor and improve the associated measurement chain. The work presented here is implemented in the framework of the design/amelioration and the characterization of the measurement chain leading to the relative uncertainty of 1.10-8. Exploratory studies were also conducted about the possible partial or full automation of elements of the measurement chain
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5

Li, Kai-Chiang, and 黎凱強. "Research and development of label-free electrochemical impedance bio-affinity metrology system." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/71888116342601326223.

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Анотація:
碩士
國立臺灣大學
應用力學研究所
100
With the societal advancement, living style improvement, and medical technologies development, the average human life span has increased significantly. These changes also signal the coming of aging society. The body function and metabolism of the elders are known to be weaker than grownups and children. In addition, the elders are prone to many chronic diseases or cancer. All of which indicate that home care and health care services of elders are becoming ever more important. The biosensors developed with a goal to pursue point of care are becoming more widely available. This thesis focuses on developing a label-free electrochemical biosensor that fits the point-of-care application needs. Taking novel conducting linker as the starting point and integrating it into the corresponding chip equipped with microfluidic system developed by the NTU BioMEMS team, this thesis further utilized electrochemical impedance spectroscopy to develop a complete bio-affinity metrology system. With the adoption of the innovative conducting linker developed within the team, the signal to noise ratio of traditional electrochemical bio-affinity sensor was greatly improved such that the difficulty associated with the design and the implementation cost of the interfacing circuits were minimized. In the signal processing part, we used a DAQ card (data acquisition card) to digitize the analog signal. We then employed LabVIEW to establish the lock-in amplifier for noise elimination so as to lead to precise impedance measurement. Besides, we integrated driving circuits of syringe pump into an electro-board, which was controlled by using LabVIEW to design the HMI (Human Machine Interface). Our biochips were made by micro machining process with glass as the substrate and Au as the working electrode. We also designed a locking mechanism to ease the biochips replacement and to reduce the overall system volume. Our study measures C-reactive protein, S-100 protein, successfully. These results verified the feasibility and sensitivity of our system, which was found to meet the lowest detected limits currently required by the hospital. We found that protein with bigger molecular weight may result in bigger ΔRct changes.
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Тези доповідей конференцій з теми "Impedance metrology"

1

Elmholdt Christensen, Andreas. "A versatile electrical impedance calibration laboratory based on a digital impedance bridge." In 19th International Congress of Metrology (CIM2019), edited by Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201911002.

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A four-terminal pair fully digital impedance ratio bridge is described. Its principle of operation including balancing procedure and calculation of unknown impedance value is presented. An initial 1:1 ratio check of the bridge has been performed. Systematic errors of the bridge design and actions to deal with these errors are shown.
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2

Overney, Frederic, Nathan E. Flowers-Jacobs, Blaise Jeanneret, Alain Rufenacht, Anna E. Fox, Paul D. Dresselhaus, and Samuel P. Benz. "Dual Josephson Impedance Bridge: Universal bridge for impedance metrology." In 2020 Conference on Precision Electromagnetic Measurements (CPEM 2020). IEEE, 2020. http://dx.doi.org/10.1109/cpem49742.2020.9191748.

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3

Sedlacek, R. "Digital Compensation Unit for Impedance Metrology." In 2004 Conference on Precision electromagnetic Digest. IEEE, 2004. http://dx.doi.org/10.1109/cpem.2004.305399.

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4

Power, Oliver, Adam Ziolek, Andreas Elmholdt Christensen, Andrei Pokatilov, Anca Nestor, Gulay Gumez, Jan Kučera, et al. "Practical Precision Electrical Impedance Measurement for the 21st Century – EMPIR Project 17RPT04 VersICal." In 19th International Congress of Metrology (CIM2019), edited by Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201902001.

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The core objective of EMPIR project 17RPT04 VersICaL is to improve the European measurement infrastructure for electrical impedance, with particular emphasis on the capabilities of developing NMIs and calibration centres. The project will seek to exploit the results of existing research on digital impedance bridges (DIBs) by designing, constructing and validating simple, affordable versions suitable to realise the impedance scale in the range 1 nF to 10 μF and 1 mH to 10 H with relative uncertainties in the range 10-5 to 10-6. The first results of the research project, including the bridge designs and details of a polyphase digitally synthesized multichannel source capable of providing voltage outputs of precise ratio and phase are presented.
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5

Agustoni, Marco, and Frederic Overney. "Impedance Metrology: Bridging the LF-RF Gap." In 2020 Conference on Precision Electromagnetic Measurements (CPEM 2020). IEEE, 2020. http://dx.doi.org/10.1109/cpem49742.2020.9191807.

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6

Palafox, L., F. Raso, J. Kučera, F. Overney, L. Callegaro, P. Gournay, A. Ziołek, et al. "AIM QuTE: Automated Impedance Metrology extending the Quantum Toolbox for Electricity." In 16th International Congress of Metrology. Les Ulis, France: EDP Sciences, 2013. http://dx.doi.org/10.1051/metrology/201311001.

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7

Hassel, Juha, Leif Gronberg, Panu Helisto, Heikki Seppa, Jaani Nissila, and Antti Kemppinen. "Fast Josephson Arrays for Voltage and Impedance Metrology." In 2004 Conference on Precision Electromagnetic Measurements. IEEE, 2004. http://dx.doi.org/10.1109/cpem.2004.305507.

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8

Obrzut, J., K. Migler, L. Dong, J. Jiao, David G. Seiler, Alain C. Diebold, Robert McDonald, et al. "Impedance and Capacitance Measurement of Individual Carbon Nanotubes." In CHARACTERIZATION AND METROLOGY FOR NANOELECTRONICS: 2007 International Conference on Frontiers of Characterization and Metrology. AIP, 2007. http://dx.doi.org/10.1063/1.2799422.

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9

Surdu, Michael, Alexander Lameko, and Alexey Panich. "Improvement of the accuracy of the logometric impedance meters in wide frequency range." In 16th International Congress of Metrology. Les Ulis, France: EDP Sciences, 2013. http://dx.doi.org/10.1051/metrology/201311016.

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10

Moreno, J. Angel, and Pierre Gournay. "Capacitance metrology at the BIPM to support National Metrology Institutes." In 19th International Congress of Metrology (CIM2019), edited by Sandrine Gazal. Les Ulis, France: EDP Sciences, 2019. http://dx.doi.org/10.1051/metrology/201914001.

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Анотація:
The Bureau International des Poids et Mesures (BIPM) is an international organization which works to promote and advance a coherent system of measurements throughout the world, traceable to the International System of Units (SI). One of its activities consists of the dissemination of units and the comparison of national measurement standards, which requires the availability of well-known and well-characterized standards. In particular, in the field of electricity, the BIPM supports capacitance measurements based on a quantum reference, impedance bridges and stable transfer standards, establishing traceability to the defining fundamental constants of the SI. In this paper it will be explained how the farad is realized at the BIPM, including a general description of the measuring systems, and how this unit is maintained.
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