Kalibrierung von Wärmestromsensoren zur Detektion von kleinen Wärmeströmen. - In: Technisches Messen, ISSN 2196-7113, Bd. 83 (2016), 7/8, S. 393-401
http://dx.doi.org/10.1515/teme-2015-0016
Measurement uncertainty consideration in the case of precision length measurement applications. - In: Technisches Messen, ISSN 2196-7113, Bd. 83 (2016), 7/8, S. 453-458
http://dx.doi.org/10.1515/teme-2015-0035
Local Lorentz force flowmeter at a continuous caster model using a new generation multicomponent force and torque sensor. - In: Measurement science and technology, ISSN 1361-6501, Bd. 27 (2016), 6, S. 065302, insges. 9 S.
Lorentz force velocimetry is a non-invasive velocity measurement technique for electrical conductive liquids like molten steel. In this technique, the metal flow interacts with a static magnetic field generating eddy currents which, in turn, produce flow-braking Lorentz forces within the fluid. These forces are proportional to the electrical conductivity and to the velocity of the melt. Due to Newton's third law, a counter force of the same magnitude acts on the source of the applied static magnetic field which is in our case a permanent magnet. In this paper we will present a new multicomponent sensor for the local Lorentz force flowmeter (L2F2) which is able to measure simultaneously all three components of the force as well as all three components of the torque. Therefore, this new sensor is capable of accessing all three velocity components at the same time in the region near the wall. In order to demonstrate the potential of this new sensor, it is used to identify the 3-dimensional velocity field near the wide face of the mold of a continuous caster model available at the Helmholtz-Zentrum Dresden-Rossendorf. As model melt, the eutectic alloy GaInSn is used.
http://dx.doi.org/10.1088/0957-0233/27/6/065302
High-precision horizontally directed force measurements for high dead loads based on a differential electromagnetic force compensation system. - In: Measurement science and technology, ISSN 1361-6501, Bd. 27 (2016), 4, S. 045107, insges. 13 S.
http://dx.doi.org/10.1088/0957-0233/27/4/045107
Methods of surface reconstruction from the white light interferogram based on Hilbert transform :
Metody rekonstrukcji powierzchni z interferogramu âswiatła białego bazuj&hlink;ace na transformacie Hilberta. - In: Zeszyty naukowe Politechniki Rzeszowskiej, ISSN 2300-6358, Bd. 34 (2015), 4, S. 71-75
The paper presents methods for nonlinear surface profile reconstruction from the white light interferogram based on Hilbert transform. The accuracy of these methods was analyzed on the example of a spherical surface reconstruction. The method investigation included surface and interferogram synthesis based on the mathematical model and estimation the profile reconstruction error. The method of estimating the instantaneous phase of the interferogram showed the greatest accuracy.
https://doi.org/10.7862/re.2015.39
Metrological array of cyber-physical systems : Part 13 : segmental approximation for surface topology reconstruction. - In: Sensors & transducers, ISSN 2306-8515, Bd. 195 (2015), 12, S. 50-55
This article presents the segment approximation method for surface topology reconstruction from white light interferogram. The method involves polynomial approximation of separate interferogram segments, and polynomial coefficients are computed at calibration stage. Metrological properties of proposed method are investigated by interferogram modeling tilted and spherical surfaces.
Prozessmesstechnik und Präzisionsmesstechnik : editorial. - In: Technisches Messen, ISSN 2196-7113, Bd. 82 (2015), 7/8, S. 391-392
Das 58. Ilmenauer Wissenschaftliche Kolloquium, das vom 8. bis 12. September 2014 stattfand, stand unter dem Motto Shaping the Future by Engineering. Das Ilmenauer Wissenschaftliche Kolloquium (IWK) hat eine mehr als 50-jährige Tradition und ist damit eine der dienstältesten ingenieurwissenschaftlichen Konferenzen Deutschlands. Die drei Hauptthemen der Konferenz "Precision Engineering and Precision Measurement Technology", "Mechatronics, Biomechatronics and Mechanism Technology" und "SystemsTechnology" spiegeln die Forschungsschwerpunkte und -strategien der Technischen Universität Ilmenau und besonders der Fakultät für Maschinenbau wider, die im Jahr 2014 Ausrichter des IWK war. Dieses Schwerpunktheft enthält 7 ausgewählte Artikel, die aus Konferenzvorträgen in den durch das Institut für Prozessmess- und Sensortechnik organisierten Konferenzreihen Nanopositioning and Nanomeasuring Machines und Measurement and Sensor Technology entstanden sind.
https://doi.org/10.1515/teme-2016-0014
Sonderforschungsbereich 622 "Nanopositionier- und Nanomeßmaschinen". - In: Jenaer Jahrbuch zur Technik- und Industriegeschichte, ISSN 2198-6746, Bd. 18 (2015), S. 431-440
Das Institut für Prozeßmeß- und Sensortechnik. - In: Jenaer Jahrbuch zur Technik- und Industriegeschichte, ISSN 2198-6746, Bd. 18 (2015), S. 135-146
Quantification of free convection effects on 1 kg mass standards. - In: Metrologia, ISSN 1681-7575, Bd. 52 (2015), 6, S. 835-841
We determine the free-convection effects and the resulting mass differences in a high-precision mass comparator for cylindrical and spherical 1 kg mass standards at different air pressures. The temperature differences are chosen in the millikelvin range and lead to microgram updrafts. Our studies reveal a good agreement between the measurements and direct numerical simulations of the Boussinesq equations of free thermal convection. A higher sensitivity to the free convection effects is found for the spherical case compared to the cylindrical one. We also translate our results on the free convection effects into a form which is used in fluid mechanics: a dimensionless updraft coefficient as a function of the dimensionless Grashof number Gr that quantifies the thermal driving due to temperature differences. This relation displays a unique scaling behavior over nearly four decades in Gr and levels off into geometry-specific constants for the very small Grashof numbers. The obtained results provide a rational framework for estimating systematic errors in mass metrology due to the effects of free convection.
https://doi.org/10.1088/0026-1394/52/6/835