Gonçalo Baptista, Florbela A. Dias, Eduarda Filipe
In this paper it will be discussed the gravimetric method to produce ethanol primary gas standards according to the international standard ISO6142. The ethanol gas standards are prepared by vaporizing ethanol in nitrogen and compressing them in a pressurized cylinder. During the preparation process careful control of weighing and all parameters that can influence it, such as air temperature, pressure and humidity, shall be made. The standards composition are further analysed by the analytical method non dispersive infrared spectroscopy (NDIR). The traceability is assured comparing the...
XIX IMEKO World Congress
· TC24
· 2009
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Aleksandar Nikolic, Ilija Stevanovic
Power quality measurement analysis of the electrostatic precipitator in thermal power plant under different working conditions is presented in the paper. Control of electrostatic precipitator is realized by digitally controlled antiparallel thyristors. In the first regime (continual) the constant firing angle of thyristor is set in dependence of the reference current. In other regime (intermittent) the ON/OFF period is set. For both control strategies the measurement of the content of higher harmonic of voltage and current is performed. Analysis of the measured results is done according to...
XIX IMEKO World Congress
· TC4
· 2009
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Jerzy Sladek, Marcin Krawczyk
The article describes the transplantation of Matrix Method as an assessment of accuracy of coordinate measurement for Large CMM. The method of the synthetic description of the accuracy is used successfully for small and medium-sized CMMs. It is implemented for large measurements as research project nr: PB 5T07/D03824. The issue involves many problems, especially from a technical point of view. This article presents experiments concerning connections between reference subspaces – the crucial elements for implementation of Matrix Method.
XIX IMEKO World Congress
· TC14
· 2009
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Francesco Crenna, Giovanni Battista Rossi, Luca Bovio
Hopping is a gesture that, though simple, is apt to providing precious information on human-body dynamics, including dynamic stability. Currently available studies are normally based on a limited set of sensors and scarcely provide metrological details. This paper presents a new multi-sensors measurement set-up, including acceleration, force, angles and image-based positions. The metrological characteristics of the system are discussed, including systematic and random uncertainty contributions, measurement conditions and procedure. The same experimental apparatus may be used for studying...
XIX IMEKO World Congress
· TC18
· 2009
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Francesco Crenna, Giovanni Battista Rossi
The measurement of the vibration transmitted to the human body is key for the prevention of the risk of spine damage, in the long run, for operators of industrial vehicles. Even if no such risk exists, such information is important for assessing the comfort and, consequently, for ensuring proper ergonomic conditions. In this paper we discuss important issues concerning the measurement of vibrations transmitted to operators by vehicles used for moving and handling containers in a maritime terminal. Sensor installation is considered, with particular attention to interfacing problems, proposals...
XIX IMEKO World Congress
· TC22
· 2009
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Enrico Marcuzzi, Giorgio Parzianello, Massimiliano Tordi, Massimo Bartolozzi, Massimo Lunardelli, Antonio Selmo, Luca Baglivo, Stefano Debei, Mariolino De Cecco
Structured light systems are widely used for three-dimensional shape reconstruction. The accuracy of the vision system parameters is of paramount importance for the accuracy of the 3D reconstruction. Often the extrinsic parameters change over time due to environmental conditions, in order to compensate for structured light parameters change, a self-recalibration method based on planar homography is proposed in this paper. The method uses the planar homography of corresponding points in two camera views to identify the relative position and orientation between the two cameras: one is the...
XIX IMEKO World Congress
· TC14
· 2009
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M. João Nunes, M.J. Guiomar Lito, M. Filomena Camões, Eduarda Filipe
The first interlaboratory comparison at national level for pH measurement of a primary standard phosphate buffer solution was carried out. The main aim of the exercise was to verify the way laboratories are planning and performing pH measurements and evaluates the performance of each laboratory. Seven laboratories have participated in this study.
XIX IMEKO World Congress
· TC24
· 2009
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Vukan Ogrizovic, Violeta Vasilic, Sinisa Delcev, Jelena Gucevic
Periodic tests of quartz oscillators incorporated in GPS receivers in Serbia are performed in accredited metrological laboratories by the procedure adopted in metrological laboratory ML160. However, receivers of Serbian permanent stations network (AGROS) are permanently mounted on the top of roofs of local cadastral offices, spread along territory of Serbia. They cannot be taken to a metrological laboratory for calibration because of need for constant work. A method for testing their oscillator stability is presented in this paper.
XIX IMEKO World Congress
· TC4
· 2009
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Oliver Mack, Sascha Mäuselein
Load cells (LC) used in weighing instruments under legal control can be tested separately as a module according to the OIML recommendation R60 (R60). R60 prescribes the principle metrological static characteristics and static evaluation procedures for LCs used in weighing instruments for legal metrology. Since the 1 st revision of R60 published in 2000 further developments of LCs lead to new experience and requirements. This paper presents abnormalities of LCs observed on single test patterns like the influence of the force introduction, eccentricity effects, effects of excitation voltage...
XIX IMEKO World Congress
· TC3
· 2009
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Tomáš Radil, Pedro M. Ramos, A. Cruz Serra
This paper describes a simple power quality analyzer based on a digital signal processor. In this analyzer, a new algorithm for detection and classification of power quality events is implemented. The analyzer detects and classifies in real-time transients, waveform distortions, sags, interruptions and swells.
XIX IMEKO World Congress
· TC4
· 2009
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