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20th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2020

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

ISBN: (纸本)9780995775176

Corner loading and ground tilt are relevant error sources for precision weighing cells. The sensitive compliant mechanism of the weighing cell is subject to large dead weights with the aim to resolve small mass differences. Tilting of the base or an eccentric load application relative to the centre of the weighing pan result in lateral force components, apart from those in measurement direction. This changes the indication of the balance resulting in measurement errors. In this paper, a finite element model of the weighing cell was used to evaluate the corner load sensitivity in three directions and the tilt sensitivity in two directions. Based on a parametric study, an optimal attachment point for the weighing cell was found where all considered mechanical errors can be reduced to second order effects. Copyright © Proceedings of the 20th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Cytology

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Traceable 5D-nanofabrication with nano positioning and nano measuring machines 21

Traceable 5D-nanofabrication with nano positioning and nano ...

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21st International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2021

作者： Ortlepp, Ingo Fern, Florian Schienbein, Ralf Supreeti, Shraddha Füßl, Roland Theska, René Sinzinger, Stefan Manske, Eberhard Institute of Process Measurement and Sensor Technology Department of Mechanical Engineering Technische Universität Ilmenau Germany JUMO GmbH and Co. KG Moritz-Juchheim-Straße 1 Fulda36039 Germany Precision Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Germany Electronics Technology Group Department of Electrical Engineering and Information Technology Technische Universität Ilmenau Germany Optical Engineering Group Department of Mechanical Engineering Technische Universität Ilmenau Germany

ISBN: (纸本)9780995775190

Today, besides the ongoing progress in the reduction of feature sizes, the measuring and fabrication of freeform surfaces with nanometre uncertainty, e.g. for aspheric lenses or structures with high aspect ratios, are a challenging task. Usually, dealing with such objects is limited by the local tilt angle between the object surface and the tool axis. There are different approaches to perform such measurements. In this paper, an extension of the Nano Measuring Machine NMM-1 with two rotational axes is described. With the proposed setup, it is possible to orientate the tool-axis perpendicular to the sample in every position, allowing larger angles to be measured / structured and minimising the uncertainty of the process e.g. due to the tilt dependency of the tool. Various machine designs are investigated and finally a solution with one rotary and one goniometer stage is integrated, preserving the existing machine infrastructure and allowing the addressability of a full hemisphere without limiting the measuring volume. As the tool centre point maintains its position during tool rotation, the Abbe principle is still fulfilled in every angular orientation. Emphasis was put on the metrological traceability of the whole system, including linear and rotary axes as well the tool itself. This was achieved by using a reference hemisphere, compensating the trajectory errors of the rotational axes. For the developed arrangement, the measurement uncertainty was investigated and several strategies for an in-situ-calibration of the additional axes are described. Finally, nanofabrication on large slopes is demonstrated. © 2021 Proceedings of the 21st International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2021. All rights reserved.

关键词： Machine design

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Lensless Near-Field Imaging with Enhanced Deep Super-Resolution Towards Real-Time Intraoperative Tumor Classification

Lensless Near-Field Imaging with Enhanced Deep Super-Resolut...

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Imaging Systems and Applications, ISA 2022

作者： Czarske, J.W. Wang, T. Wu, J. Uckermann, O. Galli, R. Kuschmierz, R. Laboratory of Measurement and Sensor Systems TU Dresden Helmholtzstrasse 18 Dresden01069 Germany TU Dresden Dresden Germany State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instruments Tsinghua University Beijing100084 China Department of Neurosurgery University Hospital Carl Gustav Carus TU Dresden Dresden Germany Division of Medical Biology Department of Psychiatry Faculty of Medicine University Hospital Carl Gustav Carus TU Dresden Germany Department of Medical Physics and Biomedical Engineering Faculty of Medicine Carl Gustav Carus TU Dresden Germany

A deep learning assisted fiber endoscopy is proposed. Resolutions beyond physical limitations are achieved, resulting in increased tumor diagnostic accuracy. This method is promising for rapid minimal-invasive intraop... 详细信息

ISBN: (纸本)9781557528209

关键词： Tumors

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Analytical Description of the Deformation Under Load of a Planar Weighting Cell

SSRN

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SSRN 2023年

作者： Jahn, Hannes Fröhlich, Thomas Zentner, Lena Mechanics of Compliant Systems Group Department of Mechanical Engineering Technische Universität Ilmenau P.O. Box 100565 Ilmenau98684 Germany Institute for Process Measurement and Sensor Technology Department of Mechanical Engineering Technische Universität Ilmenau P.O. Box 100565 Ilmenau98684 Germany

Compliant mechanisms with solid-state hinges are gaining prominence in research and industry due to their desirable attributes like reproducibility, zero backlash and low maintenance requirements. Load cells, a type of compliant mechanism, find frequent application in force measurement and weighing technology. They can be categorized into strain-based cells and compensation ***-based load cells, considered deformation-based cells, are commonly seen in household kitchen scales. These cells register deformation caused by a load, measured as resistance using strain gauges. Current design methods rely on finite element simulations or complex empirical approaches, but an analytical approach is also *** theory of large deflections of rod-like structures proves suitable for analytically describing compliant mechanisms, which are symmetric along the beam axis. It enables the analysis of deformations and strains along the entire beam axis, which is crucial for measuring forces. This paper aims to develop an analytical model for describing such load cells, which consist of transversally symmetric hinges and, therefore, are not described analytically. Additionally, the authors aim to implement the developed model in a user-friendly graphical interface for broader accessibility. © 2023, The Authors. All rights reserved.

关键词： Strain gages

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Smart Multi-coil Inductive Power Tranmission with IoT Based Visulization 6

Smart Multi-coil Inductive Power Tranmission with IoT Based ...

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6th IEEE World Forum on Internet of Things, WF-IoT 2020

作者： Bouattour, Ghada Hu, Zheng Jmeaa Derbel, Houda Ben Kanoun, Olfa Technische Universität Chemnitz Chair for Measurement and Sensor Technology Chemnitz Germany University of Sfax Department of Electrical Engineering Sfax Tunisia

ISBN: (纸本)9781728155036

Multi-coil inductive power transmission technology has been widely investigated due to their ability to charge devices in large transmission area. In this paper, an implementation of multi-coil inductive power transmission system has been presented. The proposed system is composed by 16 coils organized in 4 columns and 4 rows controlled by switches. A small size sending side circuit is used, which is composed of a singular AC oscillator, power amplifier, resonant compensation capacitor and a passive voltage. This circuit offers a small size electronic parts, simplicity during implementation and low cost. An IoT Android application offers to the user the possibility of tracking the device to be charged on top of multicoil sending inductive power transmission system. A Bluetooth module has been connected to the sending side circuit to establish the communication with the user smartphone. To show the electronic circuit voltages, an LTspice simulation using realistic components has been presented. The proposed multi-coil system with the developed Android App. has been experimentally implemented. © 2020 IEEE.

关键词： Internet of things

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Improved Particle Swarm Optimization Algorithm for EIT Image Reconstruction

Improved Particle Swarm Optimization Algorithm for EIT Image...

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

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

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

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

SSRN

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SSRN 2024年

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

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

关键词： Gold nanoparticles

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Fiber-optic multimode interference sensing: comprehensive characterization and its potential for strain-insensitive temperature sensing

arXiv

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arXiv 2022年

作者： Wang, Kun Mizuno, Yosuke Dong, Xingchen Kurz, Wolfgang Fink, Maximilian Lee, Heeyoung Jakobi, Martin Koch, Alexander W. Technical University of Munich Germany Department of Electrical and Computer Engineering Institute for Measurement Systems and Sensor Technology Munich80333 Germany Yokohama National University Faculty of Engineering Yokohama240-8501 Japan College of Engineering Shibaura Institute of Technology Tokyo135-8548 Japan

A strain-insensitive temperature sensor based on multimode interference using standard multimode fibers (MMFs) is proposed according to the comprehensive study of the characteristics of the MMFs. The temperature and strain dependences on the core diameter, numerical aperture (NA), and the length of the MMF section in the single-mode-multimode-single-mode (SMS) fiber structure are investigated experimentally. The results indicate that the larger core diameter of the MMF leads to higher temperature sensitivity but lower strain sensitivity (absolute values);the higher NA does not influence the temperature sensitivity but results in higher absolute value of strain sensitivity;the longer MMF section brings lower temperature sensitivity but does not have an impact on strain sensitivity. These findings also contribute to the theoretical analysis of the length dependence in the SMS fiber sensors. Besides, the results of the characterization study show that the strain sensitivity is relatively low, which brings a possibility to develop a strain-insensitive temperature sensor. The proposed sensor is used for temperature sensing while the strain is constantly applied from 0 to 1100 µΕ with steps of 100 µΕ. The measured results are consistent with the comprehensive study. The mean temperature sensitivity is 6.14 pm/◦C with a standard deviation of 0.39 pm/◦C, which proves that the proposed temperature sensor exhibits good stability and is insensitive to strain. We expect that these results will provide a profound guideline to fiber sensors based on multimode interference. Copyright © 2022, The Authors. All rights reserved.

关键词： Multimode fibers

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Mapping the optical dielectric response of isolated monolayer MoS2by push-broom microspectroscopy 2

Mapping the optical dielectric response of isolated monolaye...

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Unconventional Optical Imaging II 2020

作者： Dong, Xingchen Köhler, Michael H. Wang, Kun Jakobi, Martin Koch, Alexander W. Institute for Measurement Systems and Sensor Technology Department of Electrical and Computer Engineering Technical University of Munich Arcisstraße 21 Munich80333 Germany

ISBN: (数字)9781510634756

ISBN: (纸本)9781510634749

Two-dimensional van der Waals materials are attractive for photonics and optoelectronics due to distinctive layerdependent optical properties. Optical properties based on light-matter interactions have been revealed by modern imaging and spectroscopy techniques. Hyperspectral imaging microscopy working in line-scan mode (push-broom microspectroscopy) can provide abundant spectral information covering a large area compared to conventional spectroscopy techniques, with a higher acquisition speed than point-scan techniques such as atomic force microscopy and Raman imaging microscopy. This contribution studies in-depth the reconstruction of 3D datacubes and the extraction of optical responses of the sample. Monolayer MoS2, a subclass of semiconducting two-dimensional materials, is fabricated by the mechanical exfoliation method on the SiO2/Si substrate with an oxide thickness of 285 nm. The isolated monolayer MoS2 is observed and identified by a conventional optical microscope. The custom-built push-broom microspectroscope is utilized to scan the region of interest, with the whole spectrum of every line recorded at each frame. The spectral information of every point is collected and 3D spectral data sets are reconstructed for feature extraction and property analysis. To realize the thickness mapping of flakes, linear unmixing is employed to calculate the abundance of isolated monolayer MoS2 on the SiO2/Si substrate, improving flake identification performances. The characteristic spectrum of monolayer MoS2 is acquired by averaging the spectrum from the monolayer MoS2 flake. Furthermore, the optical dielectric response is further analyzed by Kramers-Kronig constrained analysis and Fresnel-law-based analysis. The optical dielectric function is calculated and compared based on the refractive index and medium thickness. This detailed analysis of optical dielectric responses highlights the feasibility of push-broom microspectroscopy for two-dimensional materials characterizat

关键词： Refractive index

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Calibration of X-ray computed tomography for surface topography measurement using metrological characteristics 21

Calibration of X-ray computed tomography for surface topogra...

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21st International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2021

作者： Thompson, Adam Rodríguez-Sánchez, Ángela Senin, Nicola Eifler, Matthias Hering, Julian Leach, Richard Manufacturing Metrology Team Faculty of Engineering University of Nottingham United Kingdom Department of Engineering University of Perugia 06125 Italy Institute for Measurement and Sensor Technology Technische Universität Kaiserslautern Gottlieb-Daimler Str. Kaiserslautern67663 Germany Department of Physics Research Center OPTIMAS Technische Universität Kaiserslautern Erwin-Schrödinger-Str. 56 Kaiserslautern67663 Germany

ISBN: (纸本)9780995775190

X-ray computed tomography (XCT) has been shown to be capable of capturing surface topography information comparable to that acquired using established surface measurement systems. However, calibration of XCT for surface measurement has not yet been achieved. The factors that influence XCT measurement are numerous, and the ways in which these factors affect measurements are not always clear. However, the problem of understanding complex, numerous influence factors exists for other measurement technologies as well, with factors being difficult or impossible to quantify in many cases, often because they cannot be measured in isolation from other influence factors. In measurement of areal surface topography, a calibration framework based on understanding the metrological characteristics (MCs) of an instrument has been developed to address the uncertainty problem;recently attaining international acceptance with the publication of ISO 25178-600. This framework was developed to allow calibration without characterising all the influence factors individually. Instead of examining all possible factors within a measurement system, the framework examines a few standardised characteristics of the system (i.e. MCs), as an approximate means to understanding measurement uncertainty. While some individual influence factors are inevitably double-counted (in that some factors contribute to more than one MC), the MC framework can be used to provide calibration for complex systems, with the caveat that double counting leads to slight increases in the determined measurement uncertainties. In this work, we apply the ISO 25178-600 MC framework to an XCT measurement system, demonstrating a method of calibrating such a system for surface measurement. We present a material measure to be used for this purpose. Given the novelty of applying the MC framework to XCT measurement and the associated complexities, we also provide an assessment of the MC framework with respect to its suitability for c

关键词： Surface measurement

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