Frank Härtig, Christian Keck, Karin Kniel, Heinrich Schwenke, Franz Wäldele, Klaus Wendt
This paper presents a novel approach to improve the accuracy of coordinate measuring machines (CMM) by integrating a single high precision tracking interferometer (TI) as an additional measurement axis. Improved positions are obtained by a combination of the CMM positions as read from the scales and the distances produced by the TI. Monte-Carlo simulations of length and flatness measurements show that the uncertainties can be reduced considerably by an appropriate configuration. First measurements confirm the results of preliminary simulations.
XVII IMEKO World Congress
· TC7
· 2003
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Eugen Trapet, Vit Zeleny, Pavel Skalnik, Vaclav Bauma
To determine partial geometric errors of coordinate measuring machines (CMM), laser interferometers are used, but more and more also calibration-fit objects – artifacts. Most of all, objects with balls – ball-plate, ball-bar are used. The EU MTCHECK project intends, as one of its goals, to use these artifacts not only for calibration of coordinate measuring machines, but also for calibration of computer numeric control (CNC) machine tools. Partners in the project were the following companies, institutes and universities: UNIMETRIK, Spain (coordinator), CMI, Czech Republic, IBS, Netherlands,...
XVII IMEKO World Congress
· TC7
· 2003
· Download
Hiroshi Watanabe
Measurement should be objective in principle. However, the accuracy of measurement often depends on various factors, including instruments of measurement, adopted intentionally or made available accidentally, and from a practical point of view, it is important to choose a suitable degree of the accuracy of measurement for the intention of measurement. The present paper discusses some information-theoretical aspects of the relationship between the degree of the accuracy of nominal description of objects and the interdependence among groups of those objects within a formal framework of...
XVII IMEKO World Congress
· TC7
· 2003
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Eugen-Georg Woschni
After an introduction to the mathematical theory of rheolinear systems the application of the results leads to the fact that due to the synchronization there arises a frequency deviation even outside of the synchronization range. The errors caused by this effect were investigated and consequences for highprecision frequency or time measurement and methods of error-correcting are obtained.
XVII IMEKO World Congress
· TC7
· 2003
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Shaomin Zhou, Jouko Halttunen
This paper describes a low cost system to measure the consistency profile of pulp based on electrical impedance tomography (EIT). A 16-electrode sensor is applied to acquire the cross-sectional data. Data acquisition is controlled by a single-chip computer, which receives commands from host computer, initializes hardware, acquires data and sends them to host computer via a serial port. All the measurement parameters such as the amplitude and frequency of the injected current can be set by software in host computer. The consistency profile image is reconstructed by modified Newton-Raphson...
XVII IMEKO World Congress
· TC7
· 2003
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Hubert Zangl, Stefan Cermak, Bernhard Brandstätter, Gerald Gruber, Georg Brasseur
In order to optimize front-end topologies of capacitive sensors precise knowledge of the coupling capacitances is important. These capacitances are not easily accessible by means of measurement without significantly altering them, and therefore a numeric method for determining them is advantageous. In this paper we use a Boundary element formulation for this task. Certain aspects of numerical accuracy of the formulation used are addressed. Results from simulations and optimizations are presented and compared with experimental results for validation of the approach.
XVII IMEKO World Congress
· TC7
· 2003
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Blaz Santic
The paper describes a new approach based on Chebyshev method, which is stabilized by an arbitrary small weighing of least-squares principle in order to permit the reliable and repeatable examination of the best fit geometric elements in a simple and very complex geometry. Field of application of new method is geometry quality control in automotive and machinery building industry, in plastic forming etc. The method can be also used for further investigations of margin and stability conditions of Chebyshev method.
XVII IMEKO World Congress
· TC7
· 2003
· Download
Blaz Santic
The paper describes a new precision evaluation method for testing of the work pieces under enveloping conditions using complete gauging, as defined by ISO 1101 and ISO 2692. The method permits a reliable examination of the best fit elements in a very complex geometry under consideration of all defined links between the geometric elements and all defined tolerance zones, with the least fault zones.
XVII IMEKO World Congress
· TC7
· 2003
· Download
Zobeida Cisneros, Ivan Apolo, Teresa Vera, Leo Van Biesen, Tesfa Ghebreegziabeber, Ma. del Pilar Cornejo, Francisco Torres
The university institution plays an important role as generator and bank of information through research (starting with thesis works), human and technological resources, while keeping up-to-date with the demands of the community on the formation of professionals. It is the commitment of the authors and the whole of the research team to elaborate, with all the means available at the academic institutions they belong to, this Geographic Information System to accomplish the goal of providing the stakeholders in the Gulf of Guayaquil (GG), Ecuador, objective means for decision-making. The...
XVII IMEKO World Congress
· TC7
· 2003
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Mathias J. Niemann
The cross-correlation function is commonly used to measure the transit time between two similar signals. The maximum value of the cross-correlation function corresponds to the transit time. The other way to measure this is to add the two signals. This method is comparable with the well known interference measurement technique. In the spectrum of the added signals after filtering a cosine function can be determined. The frequency of this function is directly proportional to the transit time.
XVII IMEKO World Congress
· TC7
· 2003
· Download