Dae-Im Kang, Hou-Keun Song, Jeong-Tae Lee, You-Kyu Park, Jong-Ho Kim
This paper describes traceability of large force standards up to 30 MN in Korea. 15 material testing machines of each having more than 10 MN capacity in industrial companies have been used for evaluating performances of mechanical components such as a pot bearing or an elastic bearing which is one of the important components in bridges. We have 10 MN force standard machine with relative uncertainty of 5·10 -4 ( k = 2). We designed build-up force measuring systems of having 30 MN capacity to be used in calibrating material testing machines above 10 MN capacity. We have evaluated uncertainty...
XVII IMEKO World Congress
· TC3
· 2003
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Michael Kobusch, Thomas Bruns
The prototype of a new facility for impulse force calibrations is presented in this paper. Furthermore, first experiences and measurements are described. Impulse forces are generated by a collinear impact of two cubeshaped bodies guided by linear air bearings. Traceability of force is realised by the determination of mass and acceleration, where the latter is derived from the velocity signal of a Laser-Doppler interferometer (LDI).
XVII IMEKO World Congress
· TC3
· 2003
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Gerd Jäger, Roland Füßl
Force measurement at a resolution in the micronewton range is advantageously performed by means of electromagnetic force compensation. So far, weighing systems of this kind have been working only in a horizontal position. Although resistance strain gauge force sensors are suited to various force directions, they cannot be used for precision measurements in the micronewton range. In this paper, an interference-optical force (IOF) sensor is described which can be used both for horizontal and vertical force measurement. The force measuring range of a specially designed force sensor amounts to...
XVII IMEKO World Congress
· TC3
· 2003
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C. Ferrero
One of the most important activities of the National Accreditation Body (NAB) in the framework of the European cooperation for Accreditation (EA), is the organisation of a series of Interlaboratory Comparisons (ILC), to verify the measurements capability of the accredited calibration laboratories. In 2002 one ILC, for the calibration of torque wrenches, was organised in Italy by SIT (Sistema Italiano di Taratura) with the IMGC-CNR as pilot laboratory. In the present paper the main results obtained during the ILC are discussed, in particular the differences on the repeatability and accuracy...
XVII IMEKO World Congress
· TC3
· 2003
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C. Ferrero, C. Marinari, E. Martino
The establishment of national calibration services (NCS) and mutual agreements between the NCS of the different countries (UKAS, DKD, SIT, etc.) have increased the necessity of the dissemination of the unit of force inside the individual countries and of standards harmonisation through continuous international comparison. In the paper the development, construction and preliminary metrological characterization of a Build-Up System (Force Transducers Pyramid Type) are described. In its construction three force transducers, in the nominal range of 1000 kN were used, individually calibrated and...
XVII IMEKO World Congress
· TC3
· 2003
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Vladimir Pašagic, Dubravko Risovic, Srdan Divjak
In the EU, the empirical relation used for determination of the fleshiness of pig carcasses based on measured thickness of fat and muscle tissue in predetermined measuring points is determined by prescribed procedure. The devices for measuring the thickness of fat and muscle tissue are mainly optoelectronic or ultrasound devices. In RH an optoelectronic device, ERO-1 has been developed according to the regulated technical and metrological demands valid in the EU. The ERO-1 device is calibrated and its length-measuring capability is traceable to RH’s national standard. The data gathered in...
XVII IMEKO World Congress
· TC2
· 2003
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Celap Stefica, Mioc Marija
Previously x-ray method was sometimes unable to accurately determine elements at low concentration in complex heterogeneous matrices. Other techniques can successfully use digestion and/or fusion methods to reduce samples to a dilute homogeneous form. However, when applying these methods of sample preparation to x-rax, detection limits were often unacceptable. The QuickSolve method is a simple but extremely effective manual operation that employs no expensive equipment. It requires a small plastic bottle preloaded with a fixed amount of the Environmental Sample preparation Matrix (ESPM)....
XVII IMEKO World Congress
· TC2
· 2003
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J. Skeivalas, K.T.V. Grattan, J.H.Milner, V. Giniotis
Many instruments for velocity measurement are based on the physical phenomenon, a Doppler effect. The paper deals with accuracy of laser meters used in the measurement of automobile velocity. The measurement results of such devices as well as of any other electronic or mechanical devices inevitably possess errors. For error analysis we will use a probabilistic method assuming that only random errors are present. To analyse systematic errors algebraic methods are usually used expressing systematic error as a function of some variables. For that purpose special measurements are performed when...
XVII IMEKO World Congress
· TC2
· 2003
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Marcin Gnyba, Malgorzata Jedrzejewska-Szczerska, Mikko Keränen, Janne Suhonen
Raman spectroscopic studies were carried out to investigate the synthesis of hybrid polymers prepared for photonic applications by a sol-gel technology. The main aim was to analyse the ability of Raman measurements to estimate the efficiency and correctness of particular stages of the technological process. Parameters of measurement systems adequate for hybrid material characterisation were found. Dedicated fibre optic system was attached to reaction glass vessel and on-line monitoring was being performed during the first step of the process - gelation. Hybrid polymer thin films, after...
XVII IMEKO World Congress
· TC2
· 2003
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Hideo Furuhashi, Ryota Sugiyama, Yoshiyuki Uchida, Kiyofumi Matsuda, Chander P. Grover
An improvement to phase measurement systems based on differentiation filters is proposed. The new technique involves calculations from measurements conducted using two different phase derivative biases. Advantages of the system are that it can be applied to semiopaque objects, and that the effects of non-uniformities in the intensity of the light source are negligible. Computer simulations are performed to verify the effectiveness of the technique.
XVII IMEKO World Congress
· TC2
· 2003
· Download