Krzysztof Stepien, Stanislaw Adamczak
In many industries (for example, in paper, electric or ship industry), large and heavy cylindrical elements play very important role. Such workpieces should posses very good quality of form and dimensions. Sometimes, they may be deformed under certain operating conditions, e.g. due to a high temperature or great external or internal loads. Consequently, wear and damage of the working surfaces are observed. Therefore cylindricity deviations of such workpieces should be measured during their manufacturing and exploitation. However, some of the workpieces cannot be measured accurately by...
XIX IMEKO World Congress
· TC14
· 2009
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Dariusz Janecki, Krzysztof Stepien, Stanislaw Adamczak
Accurate measurement of irregularities of the geometrical surface structure requires mathematical definition of relevant reference surface, which is called according to the newest terminology, an associated surface. Such surface is the reference feature in relation to which appropriate surface parameters are calculated. When measuring cylindricity deviations, the least squares or minimum zone cylinders have been mostly used as associated features. However, an ideal cylinder cannot be employed as an associated feature when measured elements are not nominally cylindrical but for example...
XIX IMEKO World Congress
· TC14
· 2009
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Elena Amico di Meane, Davide Baroncini, Stefano Crispu, Gian Carlo Piras, Michela Sega
The present work describes the approach to evaluate in a metrological correct and exhaustive way the contribution of the several sources to the uncertainty related to the calibration of nitrogen oxides (NO X ) analysers, focusing in particular on non dispersive infrared (NDIR) analysers. In order to minimize the contribution due to the uncertainty on the composition of the calibration standards, gas mixtures of NO X prepared with the gravimetric method are used. The performances of two different techniques, namely NDIR and chemiluminescence, are compared by analysing primary reference gas...
XIX IMEKO World Congress
· TC24
· 2009
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Elsa Batista, Nelson Almeida, Eduarda Filipe, João Alves e Sousa
The uncertainty calculation in the calibration of volumetric instruments is normally performed with the classical approach of the “mainstream GUM”. In order to validate the obtained results, since there is a degree of non linearity involved in handling the corresponding expression of volume, a Monte Carlo method was used as a second approach for calculation of that measurement uncertainty. The results of this comparison and corresponding conclusions are presented.
XIX IMEKO World Congress
· TC21
· 2009
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Jun Liu, Ting Huang, Wei Zhang, Yang Liu
Nicotinamide, one kind of Vitamin B, plays an important role for humans. To ensure quality control of nicotinamide in infant formula, a Certified Reference Material for nicotinamide in infant formula is being prepared in China for the first time. Studying on the procedure of sample preparation and HPLC analysis with different detectors like UV and MS, HPLC-UV and HPLC-IDMS are selected as the value assignment methods. And HPLC-IDMS method was validated in the international comparison CCQM-P78 and CCQM-K62. Homogeneity and stability are discussed in this paper as well.
XIX IMEKO World Congress
· TC23
· 2009
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Monludee Ranusawud, Ketsaya Vacharanukul, Anusorn Tonmueanwai
The National Institute of Metrology (Thailand), NIMT, maintains the standard of length in accordance with the definition of the meter through a 633 nm iodine stabilized He-Ne laser. Its accuracy is transferred to stabilized and non-stabilized lasers regarding to beat-frequency method and direct measurement using a wavelength meter, respectively. The traceability in wavelength measurement at the NIMT is discussed here. The iodine stabilized He-Ne laser is self-calibrated using the master and slave beat frequency system. NIMT participated in APMP.L-K11 intercomparison and the results are...
XIX IMEKO World Congress
· TC8
· 2009
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Yon-Kyu Park, Rolf Kumme, Dirk Röske, Dae-Im Kang
We describe the dynamic evaluation of two multi-component force-moment transducers having column-type sensing element. Among them, one has a solid cylindrical sensing element and the other has a hollow cylindrical shape. They were calibrated statically with a force-moment calibration machine in the Physikalisch-Technische Bundesanstalt (PTB), Germany. We evaluated the dynamic characteristics of the force-moment transducers by using a shaker system and a multi-channel dynamic analyser system. We have examined and presented basic dynamic characteristics of the force transducers. In this paper,...
XIX IMEKO World Congress
· TC3
· 2009
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David Martin, Derek G. Chetwynd
This paper presents the recent development of two angle standards used for the calibration of high precision spherical measurement systems. These systems are a family of instruments comprising robotic total stations, and laser trackers. It discusses the Horizontal Circle Comparator and the Vertical Circle Comparator, the way they function and are used, their uncertainty, and results of instrument calibrations.
XIX IMEKO World Congress
· TC14
· 2009
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Gaoliang Dai, Herrmann Konrad, Febo Menelao
In this paper two methods for an improved characterization of the geometry of Rockwell diamond indenters are investigated: The establishment of a group standard of indenters and the derivation of an area function with a nano measuring machine. A group standard of indenters yields better statistical results than the calibration using only one indenter. Further, a group standard of indenters guarantees a higher stability of the Rockwell hardness scales in the case that an indenter is damaged and must be replaced by a new one. The second approach is based on the correction of the hardness test...
XIX IMEKO World Congress
· TC5
· 2009
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Carlos A. Fernandes, Jorge R. Costa
This paper describes the design and use of an open Fabry-Perot resonator to evaluate the degree of anisotropy of dielectric material samples at millimeter-waves. The proposed implementation not only allows identifying the orientation of the dielectric principal axes but also determining the complex permittivity values along these axes.
XIX IMEKO World Congress
· TC4
· 2009
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