Zhang Zhimin, Zhang Yue, Guo Bin, Meng Feng, Li Tao, Ji Honglei, Dai Ming
A set of 100 N·m torque standard machine is newly developed at National Institute of Metrology (NIM). By adapting the air bearing with low friction as the arm lever fulcrum, the low expansion alloy (INVOR) as the arm lever material and the accurate machining and adjustment technology, the uncertainty of 100 N·m torque standard machine is minimized. This machine is capable of realizing torque from 1 N·m to 100 N·m both in clockwise and anticlockwise direction. The working principle and mechanical structure of the machine are introduced, the uncertainty assessment and results of performance...
XIX IMEKO World Congress
· TC3
· 2009
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Christian Buchner
The Federal Office of Metrology and Surveying (BEV, Austria), developed in cooperation with the Vienna University of Technology an automatical Dead Load Machine to determine low force in the range from of 1 µmN up to 10 N. This Dead Load Machine allows 10 µN steps to determine low force by weights directly and has a resolution of 1 µN realised by a balance. Due to its special construction, the measuring range is continuous from 10 N tension to 10 N compression whereby it is possible to cover the complete range in 10 µN steps by loading weights. To realise forcesteps of 1 µN a ballance with a...
XIX IMEKO World Congress
· TC3
· 2009
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Andrzej Miekina, Roman Z. Morawski
The spectrophotometric analysis of oil mixtures, containing olive oil, is the subject of this paper. Its objective is to propose and evaluate a new methodology for determination of a selected component of such a mixture. According to this methodology, the space of concentration values to be estimated is partitioned into subspaces and the calibration is performed separately for each subspace by means of a new piecewise ridge least-squares estimator . The estimation of concentrations is carried out, using the results of calibration, in two cycles: first, rough estimates of concentrations are...
XIX IMEKO World Congress
· TC23
· 2009
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Guido Sassi, Alessia Demichelis, MariaPaola Sassi
With the goal of the realization of a primary standard of amount-of-substance fraction of VOC (Volatile Organic Compounds) at trace level, a dynamic generator is constructed, based on the diffusion phenomena, according to ISO 6145-8. Generator will be followed by a dilution system. In the present paper, generator performances are discussed. The analysis of ISO 6145-8 shows that temperature control gives the main contribution to uncertainty. The use of a more precise temperature and evaporated VOC mass results to be the main contribution. Weekly measurements of diffusion rate demonstrate the...
XIX IMEKO World Congress
· TC24
· 2009
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Christian Buchner
The Federal Office of Metrology and Surveying (BEV, Austria) has developed and realised a new fully automatic test System for hydrostatic weighing and determining the density of solids up to 50 kg. This volume comparator allows a full automatically determination of the volume of E1 weights and plummets in the range from 1 kg up to 50 kg through direct comparison with one single volume reference (e.g. a Silicium sphere) with high accuracy. In this volume comparator, two hydrostatic weighing systems for density determination work simultaneously together so that it is possible to compare the...
XIX IMEKO World Congress
· TC3
· 2009
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Ivan Frollo, Peter Andris, Jiri Pribil, Lubomir Vojtisek, Zuzana Holubekova
Electromagnetic phantom design for measurement and imaging quality testing using NMR imaging has been performed. First attempts of electromagnetic phantom computation and testing on an experimental NMR 0.1 T imager were accomplished. The existing geometrical and chemical phantoms are generally used for testing of NMR imaging systems. They are simple cylindrical or rectangular objects with different dimensions and shapes with holes filled with specially prepared water solutions. In our experiments a homogeneous phantom (reference medium) was used - a container filled with water - as a...
XIX IMEKO World Congress
· TC7
· 2009
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Marc Fontana, Patrice Bourson, Ivana Durickovic, Julien Martin, Jean-Marie Chassot, Mario Marcherri, Rémy Claverie
We demonstrate the interest of the Raman sensors in various aspects of studies in chemistry and physics. We illustrate the advantages of this technique in two applications that we have recently investigated. For the first industrial application, we related the stress of a polymer during its deformation with the Raman intensity and for the second, we managed to determine the NaCl concentration in a liquid solution. For these two applications, we develop our own signal processing to extract information from the Raman intensity.
XIX IMEKO World Congress
· TC2
· 2009
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Marek Niedostatkiewicz, Romuald Zielonko
The equivalent electrical circuits (mostly multielement two-terminals) are the common used method of modelling many technical and biological objects. The parameter identification of this kind of circuits is important in testing and diagnosis of many objects. The paper presents a time-domain identification method dedicated mainly for monitoring and diagnosis of anticorrosion coating. The method is based on applying a sequence of polynomials and measuring the object's response at the end of every signal in the sequence. Equivalent circuit parameters are calculated directly from responses using...
XIX IMEKO World Congress
· TC21
· 2009
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Carlo Ferrero, Adelina Leka
One of the most important activities of the National Accreditation Body (NAB) is the organisation of a series of comparisons (ILC), at the National level, to verify the measurements capability of the accredited laboratories. For evaluation of the best measurement capability of AEP Transducers -an calibration accredited laboratory for Force quantity - over several years (1999-2005) are carried out measurements during accreditation and re-accreditation process of this SIT Centre, whose main results are reported in the following. The results were evaluated using the E n - normalised error -...
XIX IMEKO World Congress
· TC3
· 2009
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Gopal Mahesh, Boby George, V. Jayashankar, V. Jagadeesh Kumar
A virtual instrumentation based scheme is developed for the characterization of magnetic materials. The principle used for measurement is derived from the comparison method of testing instrument transformers. A prototype has been developed by suitably modifying an instrument transformer test set. Characterization of magnetic materials at single frequency and multiple frequencies have been carried out. Typical test results obtained are presented in the paper. The developed instrument substantially reduces the testing time associated with magnetic characterization.
XIX IMEKO World Congress
· TC4
· 2009
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