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Generating ideal reference geometry for cutting edges

Journal of Physics: Conference Series 2018年第14期1065卷

作者： Abdullah Karatas Jörg Seewig University of Kaiserslautern Department of Mechanical and Process Engineering Institute for Measurement and Sensor-Technology Gottlieb-Daimler-Str. Building 44 D-67663 Kaiserslautern Germany

In the last years, many different techniques for rating cutting edges were presented. Nevertheless an automatic measurement and indication of quality from cutting edges was covered less attention. Although the state of cutting edges is very important in many cases during the manufacturing process. An automatic indication of quality can roughly be realised in three steps. The step, generating an ideal reference geometry from measured data, will be discussed in this paper. Therefore different types of splines and a robust filtering method is used. The other two steps, mainly measuring and estimating quantification parameters, were discussed in diverse sources.

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The Planck-Balance – primary mass metrology for industrial applications

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Journal of Physics: Conference Series 2018年第4期1065卷

作者： L. Günther C. Rothleitner J. Schleichert N. Rogge S. Vasilyan F. Härtig T. Fröhlich Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100 38116 Braunschweig Germany Institute of Process Measurement and Sensor Technology Technische Universität Ilmenau 98684 Ilmenau Germany

The Planck-Balance is a new weighing instrument, that utilizes the Kibble principle for mass measurements. In contrast to existing Kibble experiments the balance is aimed at applications in industrial or research use. The proposed new definition of the kilogram with a fixed value of the Planck constant will allow primary mass measurements with electrical measurements using the Kibble principle. Two instruments, PB2 and PB1 will be developed in a joint research project of the Physikalisch-Technische Bundesanstalt (PTB) and the Technische Universität Ilmenau, funded by the German Federal Ministry of Education and Research. The aimed measurement range is from 1 mg to 100 g and 1 mg to 1 kg with a relative measurement uncertainty according to E2 and E1 accuracy classes, respectively, as specified in OIML R 111-1. For the determination of the measurement uncertainty a virtual Planck-Balance will be set up, that uses Monte Carlo simulation to determine measurement uncertainties during the measurement process.

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The Emerging Field of Quantum Based measurements for Pressure, Vacuum and Beyond

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Journal of Physics: Conference Series 2018年第16期1065卷

作者： J Hendricks Z Ahmed D Barker P. Egan K Douglass S Eckel J Fedchak N Klimov J Ricker J Scherschligt J. Stone National Institute of Standards and Technology Physical Measurement Laboratory Sensor Science Division Thermodynamic Metrology Group 100 Bureau Drive Gaithersburg MD 20899-8363 National Institute of Standards and Technology Physical Measurement Laboratory Engineering Physics Division Dimensional Metrology Group 100 Bureau Drive Gaithersburg MD 20899-8363

The future of pressure, vacuum and even temperature measurement will employ lasers, Fabry-Perot optical cavities, cold atom traps and lots of quantum physics. For pressure measurement of a gas, photons interact at the quantum level such that light travels at a slower speed in gas than it does in vacuum. For extreme vacuum measurements, cold atom traps will be used to detect single collisions between gas trapped cold atoms enabling the number density of the gas to be measured. For temperature measurement is performed using silicon photonics to detect the small changes in refractive index in micro machined siliconphontoic cavities coupled to optical fibers. For dynamic pressure, NIST is developing a method where the unique quantum mechanical characteristics of the molecules are themselves the standard for pressure, making it consistent with the quantum-SI. Our approach is to use independent molecular spectroscopy as a dynamic measurement of pressure, where the pressure and temperature is ascertained by measuring time-resolved pressure-broadened spectra of CO molecules. This paper briefly reviews the status of these projects currently underway at the NIST Thermodynamic Metrology Group.

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Spectral bandwidth limitations of static common-path and single-mirror Fourier transform infrared spectrometers

Spectral bandwidth limitations of static common-path and sin...

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Fourier Transform Spectroscopy, FTS 2016

作者： Tremme, Anton J. Schardt, Michael Rauscher, Markus S. Murr, Patrik J. Koch, Alexander W. Institute for Measurement Systems and Sensor Technology Technical University of Munich Theresienstraße 90/N5 Munich80333 Germany

Microbolometer arrays allow spectral analysis of infrared light using static Fourier transform spectrometers (sFTS). Here we evaluate limitations of common-path and single-mirror sFTS regarding their spectral bandwidt... 详细信息

ISBN: (纸本)9780960038046

关键词： Mirrors

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Development of a multisensor array for localizing bats in space

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Journal of Physics: Conference Series 2018年第7期1065卷 072014-072014页

作者： Hochradel, K Sutor, A Hohler, T Becher, A Wildermann, S Institute of Measurement and Sensor Technology UMIT - Private University for Health Sciences Medical Informatics and Technology GmbH Hall in Tirol Austria Chair of Computer Science 12 Friedrich-Alexander-Universität Erlangen-Nürnberg Erlangen Germany

We present a novel multisensor array to track flight paths of bats in space. Our array is designed to be portable and, thus, field applicable. Eight microphones are employed to localize each echolocation call, whereas two cameras provide continuous information on the flight path between the calls. To reduce costs and, thus, make it available for low-budget research the array was developed from scratch including a novel acoustic signal recording and processing hardware. Our developed acoustic hardware is the first system to sample eight microphone channels synchronously at 1 MS/s/CH with 16 Bit resolution without the necessity of computers or laptops. All eight signals from the ultrasonic microphones are not only recorded but also processed in real time in the frequency as well as time domain to determine the existence of echolocation calls. Only relevant acoustic signal are recorded which enables long term deployments of the array. During the acoustic signal acquisition, the system records images of two infrared cameras at 12 Hz and, in addition, several environmental factors such as temperature, humidity and illumination. Recorded datasets can be associated with a global position and time-stamp through a GPS module and matched to the GPS coordinate system with a three-axis accelerometer. The overall system (microphones, cameras and sensors) was designed to be affordable, easy to use in the field on battery power and without the necessity of an additional laptop. Without cost optimization and only small quantity we reached a prize below 1000 EUR for a complete system.

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A fully-fibre coupled interferometer system for displacement and angle metrology 16

A fully-fibre coupled interferometer system for displacement...

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16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

作者： Köchert, Paul Weichert, Christoph Strube, Sebastian Köning, Rainer Flügge, Jens Manske, Eberhard Bundesallee 100 Braunschweig38116 Germany Institute of Process Measurement and Sensor Technology Ilmenau University of Technology Gustav-Kirchhoff-Str. 1 Ilmenau98693 Germany

ISBN: (纸本)9780956679086

We propose a compact heterodyne interferometer system for either angle, displacement or straightness measurements. It uses two offset-locked He-Ne lasers, fully-fibre coupled plane mirror interferometer optics and a self-developed phase meter. First measurement results show a standard deviation of 5 pm over 15 s at a filter bandwidth of 10 kHz while all interferometer beams were reflected by a common mirror.

关键词： Locks (fasteners)

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Influence of surface morphology on fatigue behavior of metastable austenitic stainless steel AISI 347 at ambient temperature and 300°C

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Procedia Structural Integrity 2017年 5卷 989-996页

作者： Marek Smaga Robert Skorupski Patrick Mayer Benjamin Kirsch Jan C. Aurich Indek Raid Jörg Seewig Jiří Man Dietmar Eifler Tilmann Beck Institute of Materials Science and Engineering University of Kaiserslautern P.O. Box 3049 67653 Kaiserslautern Germany Institute for Manufacturing Technology and Production Systems University of Kaiserslautern P.O. Box 3049 67653 Kaiserslautern Germany Institute for Measurement and Sensor-Technology University of Kaiserslautern P.O. Box 3049 67653 Kaiserslautern Germany Institute of Physics of Materials ASCR Žižkova 22 616 62 Brno Czech Republic

The effect of surface modification by cryogenic turning on fatigue behavior of metastable austenitic stainless steel AISI 347 was investigated in stress-controlled fatigue tests at ambient temperature (AT) and 300 °C in air. Five different surface morphologies were manufactured by the variation of turning parameters – with and without cryogenic CO 2 snow cooling and feed velocity as well as by the application of polishing for reference surfaces with a very small surface roughness. For a comprehensive characterization of the surface and near surface morphology, X-ray diffraction investigations were performed. Three phases (γ-austenite, α-martensite and ε-martensite) were detected in the near-surface microstructure after cryogenic turning while after turning without cryogenic cooling the only microstructural constituent was γ-austenite. Moreover, residual stress state, micro hardness and surface roughness play an important role in surface morphology. The experimental data on the cyclic deformation behavior and stress-strain response of all surface morphologies are reported. Reference specimens with purely austenitic surface microstructure show the highest plastic strain amplitude during cyclic loading at both AT and 300°C. At elevated temperature these specimens achieved the shortest fatigue life. Martensitic surface layers induced by cryogenic turning result in the reduction of plastic strain amplitude during cyclic loading and significantly enhance fatigue life at both tested temperatures.

关键词： metastable austenitic stainless steels martensite surface morphology cryogenic turning fatigue

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Defect localisation in photovoltaic panels with the help of synchronized thermography

Defect localisation in photovoltaic panels with the help of ...

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IEEE Instrumentation and measurement technology Conference

作者： Christian Schuss Kari Remes Kimmo Leppänen Juha Saarela Tapio Fabritius Bernd Eichberger Timo Rahkonen Circuits and Systems (CAS) University of Oulu Finland Optoelectronics and Measurement Techniques Laboratory University of Oulu Finland Oy G.W. Berg & Co Ab Finland Institute of Electronic Sensor Systems Graz University of Technology Austria

ISBN: (纸本)9781509035977

This paper investigates defects in photovoltaic (PV) panels, more precisely, the location of defects in PV panels. With the help of electrical verification, it is possible to verify the impact of defects on output performances. However, it is not possible to determine the location of defects in order to address problems, for example in the manufacturing process of PV panels. In this paper, the focus lies on finding similarities in the location of defect areas in PV panels. Samples were characterised with the help of synchronized thermography (ST) in order to obtain infrared (IR) images of PV panels. IR-images are helpful to get a visual image on the health of PV panels and identify the position of defects. This information can be useful, for example to improve the fabrication process of PV panels.

关键词： Temperature measurement Synchronization Photovoltaic systems Heating systems Electronic mail

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Form error assessment of circular-ARC cams 16

Form error assessment of circular-ARC cams

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16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

作者： Lin, Shan Jusko, Otto Härtig, Frank Seewig, Jörg Physikalisch-Technische Bundesanstalt Bundesallee 100 Braunschweig38116 Germany Technical University of Kaiserslautern Institute for Measurement and Sensor-Technology Gottlieb-Daimler-Straße Kaiserslautern67663 Germany

ISBN: (纸本)9780956679086

Precession cam profile of a camshaft has a significant effect on the performance of combustion engine. In order to evaluate the form error of a circular- Arc cam, a global cam fitting algorithm based on the nonlinear least squares method is proposed for two probing strategies, e.g. ball probe and flat probe. The parameters of form, rotation, position are estimated iteratively by the Levenberg - Marquardt algorithm. The uncertainties associated with these parameters are estimated by the Monte Carlo simulation. For different probing strategies, both the uncertainties and the form errors are statistically compared.

关键词： Cams

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Dermal Tattoo Biosensors for Colorimetric Metabolite Detection

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Angewandte Chemie 2019年第31期131卷

作者： Ali K. Yetisen Rosalia Moreddu Sarah Seifi Nan Jiang Katia Vega Xingchen Dong Jie Dong Haider Butt Martin Jakobi Martin Elsner Alexander W. Koch Institute for Measurement Systems and Sensor Technology Technical University of Munich 80333 Munich Germany School of Chemical Engineering University of Birmingham Edgbaston Birmingham B15 2TT UK School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA Department of Design University of California Davis CA 95616 USA Department of Mechanical Engineering Khalifa University Abu Dhabi 127788 United Arab Emirates Chair of Analytical Chemistry and Water Chemistry Technical University of Munich 81377 Munich Germany

Tattooing is a ubiquitous body modification involving the injection of ink and/or dye pigments into the dermis. Biosensors in the form of tattoos can be used to monitor metabolites in interstitial fluid. Here, minimally invasive, injectable dermal biosensors were developed for measuring pH, glucose, and albumin concentrations. The dermal pH sensor was based on methyl red, bromothymol blue, and phenolphthalein, which responded to a pH range from 5.0 to 9.0. The dermal glucose sensor consisted of glucose oxidase, 3,3′,5,5′‐tetramethylbenzidine, and peroxidase that detected concentrations up to 50.0 mmol L −1 . The dermal albumin sensor consisted of 3′,3′′,5′,5′′‐tetrachlorophenol‐3,4,5,6‐tetrabromosulfophthalein to measure concentrations up to 5.0 g L −1 . The sensors were multiplexed in ex vivo skin tissue and quantitative readouts were obtained using a smartphone camera. These sensors can be used to manage of acid–base homeostasis, diabetes, and liver failure in point‐of‐care settings.

关键词： Dermatologie Kolorimetrische sensoren Photomedizin Tätowierungen Tinten

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