检索结果-内蒙古大学图书馆

Test bench for the investigation of road temperature measurement

measurement: sensors 2025年

作者： Marin, Sebastian Fröhlich, Thomas Augustin, Silke Schalles, Marc Krapf, Gunter Beerel, Joseph Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology IlmenauPF 100 565 Germany

The road temperature is used as an indicator for the winter maintenance service. Consequently, it should be determinated within a known measurement uncertainty. Investigations in road weather stations revealed inconsistencies in the evaluation of the road temperature according to different measurement principles. In order to systematically investigate the differences that occurred in the measured road surface temperature, a test bench that enables simulation of the road temperature and the ambient conditions was built. This test bench will be presented in this article. © 2024

关键词： Surface temperature

来源：评论

学校读者我要写书评

暂无评论

measurement of optical fiber bending stiffness

引用

measurement: sensors 2025年

作者： Cherkasova, Valeriya Hemeling, Christoph Kissinger, Thomas Fröhlich, Thomas Institute for Process Measurement and Sensor Technology Technische Universität Ilmenau PF 10 05 65 Ilmenau98684 Germany

This paper presents traceable measurements of bending stiffness for standard optical SMF-28 fiber. Stiffness values were derived from force-displacement measurements, performed in a setup specifically designed for the stiffness calibration of MEMS and AFM cantilevers. As a test sample, fibers with free lengths of 2.8 mm, 5.0 mm, and 10.0 mm were examined. The correspondingly measured stiffness of 100.0 N/m, 14.6 N/m, and 2.4 N/m are broadly consistent with the Euler-Bernoulli beam theory. During the measurement process, deviations between load and unload cycles reaching 2 % were also observed, which can be caused by the method of fixing the optical fiber, its internal properties, stick-slip effects that occur between the sample and the load button, and internal properties of the system. This study highlights that the presented measurement approach can be used to improve the understanding of the mechanical properties of widely used optical fiber types and qualify them for use as tactile probes or for other mechanical sensing principles. © 2024

关键词： Stick-slip

来源：评论

学校读者我要写书评

暂无评论

An ultrastable metrology laser for traceable length metrology in nanopositioning machines – Towards a 10−12 uncertainty level

引用

measurement: sensors 2025年

作者： Blumröder, Ulrike Köchert, Paul Fröhlich, Thomas Ortlepp, Ingo Kissinger, Thomas Manske, Eberhard Technische Universität Ilmenau Institute of Process Measurement and Sensor Technology Ilmenau Germany Precision Engineering Division Braunschweig Germany

In this contribution we propose the incorporation of a diode laser stabilized to an ultrastable cavity (ORS) as a metrology laser within the interferometric length measurement system of a nanopositioning and -measuring machine with a lateral measurement range of 200 mm. Based on a frequency instability analysis of the ORS against a GPS-referenced frequency comb we observed a frequency drift of 6.2 kHz(Δf/f = 1.3∙10−11) during the course of one day and peak-to-peak variations below 81 kHz (Δf/f = 1.7∙10−10) over observation times up to ten days. Within daily operation of the NPMM-200, the influence of cavity-related frequency changes practically falling below the current digital resolution limit of the interferometric measurement system (2.86∙10−11) and can therefore be neglected, if a sufficient predetermination of the absolute frequency using an optical frequency comb has been applied. To guarantee an absolute tracking of the laser frequency within a non-stop service operation of the ORS at an uncertainty level of 1∙10−12, a suitable correction for the long-term frequency changes of the cavity with the help of the frequency comb has to be established. © 2024

关键词： Frequency stability

来源：评论

学校读者我要写书评

暂无评论

Contactless interferometric incremental measurement technique

引用

measurement 1988年第4期6卷 146-150页

作者： Büchner, -Ing H.-J. Jäger, sc techn G. Scientific department of process measurement and sensor technology IImenau Institute of Technology Germany

This paper presents a measurement technique which makes it possible to scan varying interference patterns by using the incremental procedure (forward-backward counting method). The essence of this procedure is that the primary interference pattern is scanned point-shaped (with a very small detector area) and in a locally identical way. The quarter-wave phase shift is realised by polarisation-optical means. By using this measurement procedure one may use plane measuring mirrors without being forced to guide them strictly in parallel. Besides, the contactless scanning of plane and curved surfaces will be possible. © 1988.

关键词： contactless Laser interferometer length measurement plane mirror

来源：评论

学校读者我要写书评

暂无评论

Investigation to the tilt sensitivity of the lorentz force velocimetry system for the flow rate measurement of low conducting fluids 23

Investigation to the tilt sensitivity of the lorentz force v...

引用

23rd IMEKO TC3 Conference on measurement of Force, Mass and Torque 2017: measurement Facing New Challenges

作者： Yan, N. Vasilyan, S. Kühnel, M. Fröhlich, T. Institute of Process Measurement and Sensor Technology TU Ilmenau Germany

ISBN: (纸本)9781510844711

In this paper a force measurement system is discussed, among others its main application is for the flow rate measurement of conducting fluids by the method of Lorentz force velocimetry. The system is designed to measure forces with high resolution in horizontal direction on the 1 kg dead load using high precision weighing balances. The influences of the tilt on the setup are investigated, in order to minimize this effect various sets of cross-checking test measurements are carried out and presented here using several counter-balancing techniques. © 2017 IMEKO-International measurement Federation Secretariat. All Rights Reserved.

关键词： Force measurement

来源：评论

学校读者我要写书评

暂无评论

Metrological long-range scanning probe microscope 6

Metrological long-range scanning probe microscope

引用

6th International Conference European Society for Precision Engineering and Nanotechnology, EUSPEN 2006

作者： Dorozhovets, N. Hausotte, T. Hofmann, N. Manske, E. Jäger, G. Institute of Process Measurement and Sensor Technology TU Ilmenau Germany

ISBN: (纸本)0955308208

This paper describes a new metrological scanning probe microscope (SPM) for high-precision long-range measurement. For accurate measurements the position of the cantilever must be measured in addition to the torsion and bending. The solution realised is a combined detection system with a single laser beam. This system has been equipped with a special interferometer system and a quadrant photodiode. The scanning motion can be provided by a coordinate positioning and measuring system of the highest accuracy, such as the nanopositioning and nanomeasuring machine (NMM) [1] with a measuring range of 25 mm × 25 mm × 5 mm. With the metrological SPM it is possible to calibrate pitch, step-heights and structure width.

关键词： Laser beams

来源：评论

学校读者我要写书评

暂无评论

Comparison of different load changers for EMFC-balances

Comparison of different load changers for EMFC-balances

引用

21st Conference on measurement of Force, Mass and Torque Together with HARDMEKO 2010 and 2nd Meeting on Vibration measurement, IMEKO TC3, TC5 and TC22 Conferences

作者： Hilbrunner, F. Weis, H. Fröhlich, T. Jäger, G. Ilmenau University of Technology Institute for Process Measurement and Sensor Technology Ilmenau Germany

ISBN: (纸本)9781618390219

In order to further improve the metrological properties of weighing systems based on the principle of electromagnetic force compensation (EMFC) as well as quality assurance, it is necessary to determine the parameters relevant for the dynamic operation, such as measurement time and controller behavior. This determination is carried out by loading the balance system and observing the indication. Typically this is done by a load changer using different metrological weights. This method is inevitable if metrological traceability is required. However, the conventional procedure of load changing also entails several disadvantages. The number of possible load changes per unit time is limited and the force characteristic during loading is usually unknown and relatively difficult to reproduce or manipulate. Furthermore the fast and sudden exchange of the weights causes mechanical vibrations and a movement of the surrounding air, both of which act as additional disturbances. In this paper we propose an alternative loading method, with which these shortcomings can be improved and compare it to a conventional system. This method is based on loading the weighing system in a defined manner using a Lorentz-force, allowing the tester to generate a known, virtually arbitrary force characteristic during loading. It is shown that the Lorentz-force generated load represents a practical alternative to classical weights, offering advantages in reproducibility, dynamics and ability to be automated. Since the proposed method applies a known Lorentz-force to the weighing system it becomes possible to exactly determine the relationship between the force acting on the weighing pan and the resulting behavior of the weighing system.

关键词： Vibrations (mechanical)

来源：评论

学校读者我要写书评

暂无评论

Novel high-resolution interferometric materials testing device for the determination of the viscoelastic behaviour of high-tech plastics

Novel high-resolution interferometric materials testing devi...

引用

19th IMEKO World Congress 2009

作者： Kühnel, M. Hilbrunner, F. Jäger, G. Ilmenau University of Technology Institute of Process Measurement and Sensor Technology Ilmenau Germany

ISBN: (纸本)9781615675937

The use of high-tech plastics in the field of mechanical engineering is increasing dramatically. The time-dependent change of strain Ε(t) during constant load (viscoelasticity, creeping) is a fundamental property of plastics and exact knowledge of these properties is required for the design of plastic parts. A novel high-resolution materials testing device is presented in this paper. It offers reaction-free interferometric measurement of the viscoelastic behaviour of plastics at a constant bending load. The resolution of the deflection is 1 nm. Therefore, unlike the three point bending test described in the ISO 899-2:2003 standard [1], the device is suitable for the measurement of viscoelasticity Ε(t) at very small strain values (Εmax

关键词： Viscoelasticity

来源：评论

学校读者我要写书评

暂无评论

Parametric mechatronic model of a load cell with electromagnetic force compensation

Parametric mechatronic model of a load cell with electromagn...

引用

21st Conference on measurement of Force, Mass and Torque Together with HARDMEKO 2010 and 2nd Meeting on Vibration measurement, IMEKO TC3, TC5 and TC22 Conferences

作者： Weis, Hanna Hilbrunner, Falko Fröhlich, Thomas Jäger, Gerd Ilmenau University of Technology Institute of Process Measurement and Sensor Technology Ilmenau Germany

ISBN: (纸本)9781618390219

In this paper a mechatronic model for an electromagnetic-force-compensated (EMC) load cell is presented. Designed in MATLAB® Simulink® the model consists of four main modules: a rigid-body model delineating the mechanical behaviour of the load cell, an analytical model characterising the electrodynamic actuator consisting of a voice coil and a permanent magnet, a characteristic curve modelling the position detector, and a continuous or discrete model describing the operation of the controller. Optimization of the mechanical, electromagnetic and controller components can be performed using this model;furthermore experiments can be performed to determine the sensitivity of the complete system to changes of defined parameters.

关键词： Permanent magnets

来源：评论

学校读者我要写书评

暂无评论

High precission optical position sensor for electromagnetic force compensated balances

High precission optical position sensor for electromagnetic ...

引用

21st Conference on measurement of Force, Mass and Torque Together with HARDMEKO 2010 and 2nd Meeting on Vibration measurement, IMEKO TC3, TC5 and TC22 Conferences

作者： Diethold, Christian Fröhlich, Thomas Hilbrunner, Falko Jäger, Gerd Ilmenau University of Technology Institute for Process Measurement and Sensor Technology Ilmenau Germany

ISBN: (纸本)9781618390219

This paper discusses an optical position sensor which can be used in balances based on the principle of electromagnetic force compensation (short used EFC) for example. Other applications are zero point detection as well as high precision positioning in the range of ± 200 μm. The position sensor consists of two infrared-LED (IR-LED) which illuminate a single photodiode via an aperture. The aperture is movable and performs a shadowing of the beams, thus shadowing changes due to the position of the aperture. The photodiode detects light from both LED. Both light sources have to be modulated and phase shifted to distinguish them in the photodiode signal. The evaluation of the position of the aperture is done by demodulating the received signal. A major advantage of this method is that the aperture's operating point is in the centre of the beams. Hence higher sensitivity is achievable and the beams can be focused onto the photodiode. Furthermore standard components are used and thus expensive differential photodiodes are no longer necessary.

关键词： Photodiodes

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：