检索结果-内蒙古大学图书馆

23rd IMEKO TC4 International Symposium on Electrical and Electronic measurements Promote Industry 4.0

作者： Rogge, Norbert Lin, Shan Rothleitner, Christian Vasilyan, Suren Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau Ilmenau98684 Germany Physikalisch-Technische Bundesanstalt Bundesallee 100 Braunschweig38116 Germany Physikalisch-Technische Bundesanstalt Bundesallee 100 Braunschweig38116 Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau Ilmenau98684 Germany

The Planck-Balance is a table-top device that utilizes the concept of a Kibble balance. In contrast to a standard electromagnetic force compensated balance, the force factor Bl is not determined by calibration with mass pieces. Instead of this static calibration, the Planck-Balance applies a sinusoidal motion on the coil and determines the Bl based on measurements of induced voltage, displacement and frequency. In order to obtain valid force calibration for the weighing experiment, one has to ensure that the determined factor does not depend on the excitation frequency of the coil. A linearization of the control loop is established in order to reduce the harmonic distortion of the measurement signals. This work presents a method for reducing the frequency dependency caused by mechanical tilt oscillations and proposes a set-up to reduce the standard deviation of the determination of the Bl. © 2019 IMEKO TC4 International Symposium Electrical and Electronic measurements Promote Industry 4.0. All rights reserved.

关键词： Calibration

来源：评论

学校读者我要写书评

暂无评论

Towards a table-top Kibble balance for E1 mass standards in a range from 1 mg to 1 kg – Planck-Balance 1 (PB1)

Towards a table-top Kibble balance for E1 mass standards in ...

引用

Conference on Precision Electromagnetic measurements (CPEM)

作者： S. Lin C. Rothleitner N. Rogge S. Vasilyan T. Fröhlich F. Härtig D. Knopf Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100 Braunschweig Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau Ilmenau Germany

ISBN: (数字)9781728158983

ISBN: (纸本)9781728158990

A table-top version of a Kibble balance called Planck-Balance 1 (PB1) has been developed in a collaboration between the Physikalisch-Technische Bundesanstalt and the Technische Universität Ilmenau. It is aimed for calibrating E1 mass standards for a mass range from 1 mg to 1 kg. This paper gives a brief overview of the concept of the PB1, its measurement setup, and some initial measurements of the force mode and the velocity mode.

关键词： Standards Voltage measurement Force Current measurement Velocity measurement Force measurement Frequency measurement

来源：评论

学校读者我要写书评

暂无评论

Amplitude estimation using three-parameter sine fitting algorithm in the Planck-Balance 23

Amplitude estimation using three-parameter sine fitting algo...

引用

23rd IMEKO TC4 International Symposium on Electrical and Electronic measurements Promote Industry 4.0

作者： Lin, Shan Rothleitner, Christian Rogge, Norbert Physikalisch-Technische Bundesanstalt Bundesallee 100 Braunschweig38116 Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau Ilmenau98684 Germany

The Planck-Balance (PB) is a table-top version of a Kibble balance. In contrast to many existing Kibble balances, the coil is moved sinusoidally and an ac rather than a dc signal is generated in the dynamic mode. The three-parameter sine fitting algorithm is applied to estimate the amplitudes of the induced voltage and the coil motion, which are used to determine the force factor Bl of the voice coil of the electromagnetic force compensation balance. However, the three-parameter sine fitting algorithm is not robust against some perturbations, e.g. additive Gaussian white noise, quantization error, and frequency error. These effects have influences on the accuracy of the amplitude estimation. Based on numerical simulations and correlation analyses, the effects of these perturbations are determined. By optimizing measurement and data processing approach, the bias and standard deviation of the estimated amplitude could be effectively reduced, and thus the accuracy of the force factor Bl in the dynamic mode can be improved. © 2019 IMEKO TC4 International Symposium Electrical and Electronic measurements Promote Industry 4.0. All rights reserved.

关键词： White noise

来源：评论

学校读者我要写书评

暂无评论

Scanning Acoustic Microscopy for Quantifying Two-phase Transfer in Operando Alkaline Water Electrolyzer

arXiv

引用

arXiv 2024年

作者： Dou, Zehua Rox, Hannes Ramos, Zyzi Baumann, Robert Ravishankar, Rachappa Czurratis, Peter Yang, Xuegeng Lasagni, Andrés Fabian Eckert, Kerstin Czarske, Juergen Weik, David Faculty of Electrical and Computer Engineering Laboratory of Measurement and Sensor System Technique Technische Universität Dresden Helmholtzstraße 18 Dresden01069 Germany Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstraße 400 Dresden01328 Germany PVA TePla Analytical Systems GmbH Deutschordenstraße 38 Westhausen73463 Germany Institute of Manufacturing Science and Engineering Technische Universität Dresden George-Baehr-Straße 3c Dresden01069 Germany Fraunhofer Institute for Material and Beam Technology IWS Winterbergstraße 28 Dresden01277 Germany Institute of Process Engineering and Environmental Technology Technische Universität Dresden Helmholtzstraße 14 Dresden01069 Germany Hydrogen Lab School of Engineering Technische Universität Dresden Helmholtzstraße 14 Dresden01062 Germany Institute for Emerging Electronic Technologies Leibniz Institute for Solid State and Materials Research Dresden Helmholtzstraße 20 Dresden01069 Germany

Improved understandings of two-phase transport in electrochemical gas-evolving systems are increasingly demanded, while high-performance imaging techniques using simplified instrumentations are not readily available. This work presents volumetric scanning acoustic microscopy (SAM) imaging for quantifying the dynamics of gas bubbles and electrolyte in porous Nickel electrodes with different wettability and structures during alkaline water electrolysis (AWE). We realize high-resolution 3D imaging at 10's µm level using high frequency spherically focused ultrasound. The high resolution allowed us to clearly visualize the spatial distributions of produced bubbles in the porous electrodes over time. Moreover, we are able to quantify the residual gas volume in an electrode and its coverage due to bubble evolution, which dominate its transport overpotential. Taking these advantages, we elucidate the impacts of electrodes' wettability and structures on their electrolysis performance, on a regular laboratory base. The obtained knowledge provides us important optimization guidelines of AWE designs and operating schemes. Copyright © 2024, The Authors. All rights reserved.

关键词： Mass transfer

来源：评论

学校读者我要写书评

暂无评论

Suppression of free convection effects for spherical 1 kg mass prototype

arXiv

引用

arXiv 2020年

作者： Sachs, Sebastian Fröhlich, Thomas Schumacher, Jörg Institute of Thermodynamics and Fluid Mechanics Technische Universität Ilmenau IlmenauD-98684 Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau IlmenauD-98684 Germany

We investigate the free convection processes in the vicinity of a spherical 1 kg mass standard by two- and three-dimensional direct numerical simulations using a spectral element method. Our focus is on the determination and suppression of updraft forces in a high-precision mass comparator which are caused by temperature differences between mass standard and its environment in the millikelvin range – a source of systematic uncertainties in the high-precison mass determination. A two-dimensional model is presented first, which obtains a good agreement with previous laboratory measurements for the smaller temperature differences up to 15 mK. The influence of different boundary conditions and side lengths of the square domain is discussed for the mass standard positioned in the center of the chamber. The complexity is increased subsequently in configurations with additional built-ins for counter heating in form of planar plates or hemispherical shells above the mass standard. The latter ones lead to a full compensation of the updraft force. Three-dimensional simulations in a closed cubic chamber confirm the two-dimensional findings and additionally reveal complex secondary flow pattern in the vicinity of the mass standard. The reduction of the heat transfer due to the built-ins is also demonstrated by a comparison of the Nusselt numbers as a function of the Rayleigh number in the chosen parameter range. Our simulations suggest that such additional constructive measures can enhance the precision of the mass determination by suppression of free convection and related systematic uncertainties. Copyright © 2020, The Authors. All rights reserved.

关键词： Natural convection

来源：评论

学校读者我要写书评

暂无评论

Mechanical properties of an adjustable weighing cell prototype 19

Mechanical properties of an adjustable weighing cell prototy...

引用

19th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2019

作者： Darnieder, Maximilian Pabst, Markus Fröhlich, Thomas Zentner, Lena Theska, René Department of Mechanical Engineering Technische Universität Ilmenau Institute for Design and Precision Engineering Precision Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Institute for Process Measurement and Sensor Technology Process Measurement Technology Group Germany Department of Mechanical Engineering Technische Universität Ilmenau Compliant Systems Group Germany

ISBN: (纸本)9780995775145

Weighing cells based on the principle of electromagnetic force compensation are highly sensitive force measuring devices. A compliant mechanism with thin flexure hinges constitutes the mechanical basis of the balance. The weighing cells are the core components of high-performance vacuum mass comparators, e.g. for the comparison of one kilogram mass standards. According to the mechanical models, the achievable sensitivity of the measurement device is only limited by the adjustment resolution. Without further measures, the vertical adjustment of small trim masses represents a trade-off between resolution and tilt sensitivity. The numerical test of the underlying adjustment concept by finite element models reveals that the objectives of a high sensitivity and a low tilt sensitivity can be achieved simultaneously by a meaningful combination of adjustment measures. This represents a promising concept for the further enhancement of vacuum mass comparators. The prototypes are planar weighing cell structures for a flexible choice of the manufacturing process. The planar mechanism facilitates the comparison between models and measurements. The weighing cells for a nominal mass of 300g are experimentally investigated. The measurement of tilt reactions is enabled by the use of a precision tilt table as base for the weighing cell. Properties like stiffness and tilt sensitivity are determined as a function of the adjustment parameters. This way the mechanical models are verified, and the property enhancement of the weighing cell is evaluated. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Cells

来源：评论

学校读者我要写书评

暂无评论

On the development and qualification of multiaxial designs of nanofabrication machines with ultra precision tool rotations 19

On the development and qualification of multiaxial designs o...

引用

19th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2019

作者： Schienbein, Ralf Fern, Florian Theska, René Füßl, Roland Institute of Design and Precision Engineering Precision Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Germany Institute of Process Measurement and Sensor Technology Department of Mechanical Engineering Technische Universität Ilmenau Germany

ISBN: (纸本)9780995775145

The majority of nanopositioning and nanomeasuring machines (NPMMs) are based on three independent linear movements in a Cartesian coordinate system with a repeatability in the nanometer range. This in combination with the specific nature of sensors and tools limits the addressable part geometries. This article contributes to the enhancement of multiaxial machine structures by the implementation of rotational movements while keeping the precision untouched. A parameter based dynamic evaluation system with quantifiable technological parameters has been set up and employed to identify general solution concepts and adequate substructures. It further on contains data based on comprehensive design catalogues, uncertainty calculations and CAD-model based footprint analysis for specific setups. First evaluations show high potential for sample scanning mode variants considering linear movements of the object in combination with angular movements of the tool, considering a goniometer setup in specific. Based on this, positioning systems for the tool rotation of a NPMM were selected and the positioning properties of different arrangements were determined in test series using autocollimators. General properties of the influence of the arrangement were derived. The arrangement of the substructures which fulfils the previous given requirements is integrated into the NPMM and investigated for long-term stability using a retroreflector as a tool and various laser interferometers. The influence of the additional positioning systems on the existing structure of NPMMs are investigated and solutions for the optimization of the overall system with regard to reproducibility and long-term stability are developed. For this purpose, comprehensive FEA simulations are carried out and structural adjustments are derived via topology optimizations. After all, the knowledge gained is formed into general rules for the verification and optimization of design solutions for multiaxial nanopositioning

关键词： Nanotechnology

来源：评论

学校读者我要写书评

暂无评论

Tip-and Laser-based 3D Nanofabrication in Extended Macroscopic Working Areas

引用

Nanomanufacturing and Metrology 2021年第3期4卷 132-148页

作者： Ingo Ortlepp Thomas Frohlich Roland FuBl Johann Reger Christoph Schaffel Stefan Sinzinger Steffen Strehle ReneTheska Lena Zentner Jens-Peter Zollner Ivo WRangelow Carsten Reinhardt Tino Hausotte Xinrui Cao Oliver Dannberg Florian Fern David Fischer Stephan Gorges Martin Hofmann Johannes Kirchner Andreas Meister Taras Sasiuk Ralf Schienbein Shraddha Supreeti Laura Mohr-Weidenfeller Christoph Weise Christoph Reuter Jaqueline Stauffenberg Eberhard Manske Institute of Process Measurement and Sensor Technology Technische Universitat IlmenauEhrenbergstrasse 2998693 IlmenauGermany Control Engineering Group Technische Universitat IlmenauIlmenauGermany Optical Engineering Group.Technische Universitat Ilmenau IlmenauGermany Microsystems Technology Group.Technische Universitat Ilmenau IlmenauGermany Precision Engineering Group.Technische Universitat Ilmenau IlmenauGermany Compliant Systems Group Technische Universitat IlmenauIlmenauGermany Micro-and Nanoelectronic Systems Group Technische Universitat IlmenauIlmenauGermany Nanoscale Systems Group.Technische Universitat Ilmenau IlmenauGermany Division for Research Service and Technology Transfer Technische Universitat IlmenauIlmenauGermany Electronics Technology Group.Technische Universitat Ilmenau IlmenauGermany IMMS Institut flir Mikroelektronik-und Mechatronik-Systeme Gemeinniitzige GmbH(IMMS GmbH) IlmenauGermany Fachgebiet Technische Physik City University of Applied SciencesBremenGermany Lehrstuhl fiir Fertigungsmesstechnik Friedrich-Alexander-U niversitat(FAU)Erlangen-NiirnbergGermany JUMO GmbH&Co.KG FuldaGermany Asphericon GmbH JenaGermany

The field of optical lithography is subject to intense research and has gained enormous ***,the effort necessary for creating structures at the size of 20 nm and below is considerable using conventional *** effort and the resulting financial requirements can only be tackled by few global companies and thus a paradigm change for the semiconductor industry is conceivable:custom design and solutions for specific applications will dominate future development(Fritze in:Panning EM,Liddle JA(eds)Novel patterning *** society for optics and ***,Bellingham,***://***/10.1117/12.2593229).For this reason,new aspects arise for future lithography,which is why enormous effort has been directed to the development of alternative fabrication ***,the technologies emerging from this process,which are promising for coping with the current resolution and accuracy challenges,are only demonstrated as a proof-of-concept on a lab scale of several square *** scale is not adequate for the requirements of modern lithography;therefore,there is the need for new and alternative cross-scale solutions to further advance the possibilities of unconventional *** challenges arise because of the technical progress in various other fields,realizing new and unique functionalities based on nanoscale effects,e.g.,in nanophotonics,quantum computing,energy harvesting,and life *** platforms for basic research in the field of scale-spanning nanomeasuring and nanofabrication are necessary for these tasks,which are available at the Technische Universitiit Ilmenau in the form of nanopositioning and nanomeasuring(NPM)*** this equipment,the limits of technical structurability are explored for high-performance tip-based and laser-based processes for enabling real 3D nanofabrication with the highest precision in an adequate working range of several thousand cubic millimete

关键词： Nanomeasuring Nanopositioning Nanomanufacturing Scale-spanning Tip-based Laser-based Nanofabrication

来源：评论

学校读者我要写书评

暂无评论

Correction: Fundamental Investigations in the Design of Five-Axis Nanopositioning Machines for measurement and Fabrication Purposes

引用

Nanomanufacturing and Metrology 2022年第4期5卷 437-437页

作者： Schienbein, Ralf Fern, Florian Theska, René Supreeti, Shraddha Füßl, Roland Manske, Eberhard Department of Mechanical Engineering Institute of Design and Precision Engineering Technical University of Ilmenau Ilmenau Germany Department of Mechanical Engineering Institute of Process Measurement and Sensor Technology Technical University of Ilmenau Ilmenau Germany Electronics Technology Group Department of Electrical Engineering and Information Technology Technical University of Ilmenau Ilmenau Germany

来源：评论

学校读者我要写书评

暂无评论

Dynamic sensor positioning in large measuring volumes by an inverse kinematic concept 22

Dynamic sensor positioning in large measuring volumes by an ...

引用

22nd World Congress of the International measurement Confederation, IMEKO 2018

作者： Ortlepp, Ingo Manske, Eberhard Füßl, Roland Institute of Process Measurement and Sensor Technology Technische Universitat Ilmenau Ilmenau98693 Germany

The growth in measuring objects and the demand for measurement precision in the sub-nanometer range are the challenges for future nano positioning and nano measuring machines (NPMMs). However, the usual moving stage principle will reach its limits due to the larger moving masses it entails for large measuring volumes. Therefore, an inverse kinematic concept for NPMMs is proposed, which permits to reduce the moving masses to a few kilogram. In this concept, the interferometers and the probe are moved, while the measuring object and the interferometer mirrors are fixed. The probe position is measured and controlled in 6 DOF. © 2018 institute of Physics Publishing. All rights reserved.

关键词： Inverse kinematics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：