Fabrizio Ciancetta, Edoardo Fiorucci, Giovanni Bucci, Carmine Landi
The problem of locate disturbance sources in power network is a critical task. Several methods based on multi point measurement techniques have been proposed in the last few years proving a good contribution on this filed. In this paper an event-based distributed measurement system for power network has been developed. The system adopts a hierarchical approach to monitor the power network: the sensing parts are measurement systems which perform the monitoring of Power Quality (PQ) parameters such as Total Harmonic Distortion (THD) and Root Mean Square (RMS); the management part is a...
XIX IMEKO World Congress
· TC4
· 2009
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Roberto Buccianti, Marco Cibien, Luca Mari, Bruno Rebaglia
Following the publication of the 3 rd edition of the International vocabulary of metrology – Basic and general concepts and associated terms , the paper gives a comprehensive analysis of specific issues concerning the calibration operations of a measuring instrument and the proper application of the many relevant concepts.
XIX IMEKO World Congress
· TC7
· 2009
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Giancarlo Golluccio, Pasquale Arpaia, Marco Buzio
The paper deals with a fast measurement technique of electromagnetic transients due to eddy currents in fast-cycled magnets for linear particle accelerators. First the context of the problem, related to the need for accurate control of the magnetic field quality in order to ensure the stability and performance of the particle beam in dynamic conditions (field ramps up to about 700 T/s) is outlined. Then the measurement technique and the setup employed are described by referring to a case study on a quadrupole magnet for Linac4, a new linear particle accelerator currently being built at CERN...
XIX IMEKO World Congress
· TC4
· 2009
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Jürgen Czarske, Thorsten Pfister, Lars Büttner
For monitoring the shape of fast rotating objects such as turbo machine rotors, contactless and compact sensors with a high measurement rate as well as high precision are required. We present a novel laser Doppler distance sensor for shape measurements of rough technical surfaces. This novel sensor offers concurrently high distance resolution in the micron range and high temporal resolution in the microsecond range. Especially the distance measurement uncertainty is, in principle, independent of the lateral object velocity. In order to prove its operational capability shape measurements of...
XIX IMEKO World Congress
· TC14
· 2009
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Željko Alar, Mladen Franz, Tamara Aleksandrov, Sanja Šolic
Reference hardness standard with HV1 – HV50 measuring range was installed at LIMS (Laboratory for Testing Mechanical Properties) at the end of 2007 with the aim of providing continuous improvement of the metrology infrastructure of Croatia. The evaluation of the measurement uncertainty is one of the most important tasks for establishing this reference standard. Therefore, the influence quantities contributing to the uncertainty were determined and the machine calibrated by direct and indirect method. In this paper the results of the measurements are presented and discussed.
XIX IMEKO World Congress
· TC5
· 2009
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Eyüp Bilgiç, Enver Sadikeglu, Baki Karaböce, Cafer Kirbas, A. Izzet Turan
The traceability of the vibration measurements to SI units is maintained through the calibration of the reference transducers. Primary calibration of the reference transducers in the field of mechanical vibration and shock is performed in accordance with the international standard ISO 16063-11. In some applications beside magnitude of the transducer’s sensitivity, the knowledge of phase shift is also required. Magnitude and phase shift of the complex sensitivity of the reference transducer could be obtained by applying the sine approximation method, described in ISO 16063-11 standard. In...
XIX IMEKO World Congress
· TC22
· 2009
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Andrzej Dobrogowski, Przemyslaw Lisowski
The relation between the level of the inrush current of a single phase transformer and the phases of disconnecting the transformer from AC source and then connecting it to the same source is investigated. The measurement setup is presented. Results of the experiment are discussed.
XIX IMEKO World Congress
· TC4
· 2009
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Vaclav Papez, Stanislava Papezova
Some measuring systems are very sensitive on disturbances incoming from power supplies. If no accumulators are used for their power supply, which ensure a minimum signal noise and transmission jamming signal from power network, special power supplies have to be constructed for them. An example of a possible influence of a disturbance, which spreads along to the power supply on high pure sine-wave signal source, is presented in our contribution, whereas the requirements on the power supply are also specified. Furthermore, an analysis of the construction of these sources is effected and a...
XIX IMEKO World Congress
· TC4
· 2009
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Miloslav Ohlidal, Ivan Ohlidal, Petr Klapetek, D. Necas
A new method of imaging spectroscopic photometry enabling us to perform the complete optical characterization of thin films exhibiting area non-uniformity in optical parameters is presented. An original imaging spectroscopic photometer operating in the reflection mode at normal incidence is used to apply this method. A CCD camera serves as a detector in this photometer. Therefore the spectral dependences of the reflectance of the films characterized are simultaneously measured in small areas of the films surface corresponding to the individual pixels of the CCD camera. These areas form a...
XIX IMEKO World Congress
· TC2
· 2009
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Jaroslav Bohacek, Radek Sedlacek, Jan Kucera
Four terminal-pair coaxial capacitance standards with nominal values of 1 pF and 10 pF have been realized and, using a uniform transmission line model, their frequency dependences have been evaluated. 1:1 comparisons against reference capacitors with known frequency dependence (Agilent 16381A and Agilent 16382A) have shown that the values of the 1 pF and the 10 pF standard change by 0,04 % and -0,05 % respectively when frequency increases from 1 kHz to 1 MHz.
XIX IMEKO World Congress
· TC4
· 2009
· Download