Murilo M. Nogueira, Sérgio R. K. Morikawa, Luis C. G. Valente, Arthur M. B. Braga
This paper describes the characteristics and metrological evaluation of an optical fiber accelerometer designed for monitoring vibrations in cables of power transmission lines. The calibration performed with laser interferometer at the Brazilian National Institute of Metrology and other tests conducted at the Electric Energy Research Center are discussed. Advantages over existing similar instruments are stressed.
XVIII IMEKO World Congress
· TC22
· 2006
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Lubomir Smutny, Jiri Tuma, Radim Farana
The paper deals with the problem of the angular vibration sensor calibration. As a reference signal is produced by an incremental rotary encoder, which is a source of pulses. The pulse string determines the encoder rotation angle. The non-uniformity in the pulse distribution with respect to the rotation angle results in an error in determining the shaft rotation angle. The main topic of the paper is focused at the comparison of the encoder pair intended to employ for calibration of the Laser torsional vibration meter (BK 2523 type) based on the Doppler Effect. The method for evaluation of...
XVIII IMEKO World Congress
· TC22
· 2006
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Jaroslav Strunc, Stanislav Dado, Jiri Buben
Studying of rotational components of ground movements belong among emerging approaches in recent geophysics. Rotations can be observed using the dense seismic arrays (micro-arrays, small aperture arrays) formed from classic three-dimensional seismic sensors. The aim of this project is a construction of portable, high-definition sensor of rotational movement around vertical axis. This sensor is based on measuring of changes of capacitance of differential capacitor.
XVIII IMEKO World Congress
· TC22
· 2006
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A. G. Steele, R. J. Douglas
This talk summarizes statistical approaches to consistency analysis using key comparison data, including conventional mediated testing relative to the inverse variance weighted mean, extensions of this chi-squared methodology to accommodate finite degrees of freedom in the uncertainty claims, and a fully bilateral approach that avoids invocation of any key comparison reference value.
XVIII IMEKO World Congress
· TC21
· 2006
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Jean Marc Linares, Jean Mailhé, Jean Michel Sprauel
A statistical approach, based on a maximum likelihood criterion, is used to define the uncertainties of the derived element associated to a set of measured coordinates. The method is applied to high quality surfaces of low extent.
XVIII IMEKO World Congress
· TC21
· 2006
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Dominik Sankowski,Krzysztof Strzecha, Michal Janicki, Tomasz Koszmider
In this paper, a case-study of the THERMOWET measurement system control application is conducted and it’s software engineering aspects are described.
XVIII IMEKO World Congress
· TC21
· 2006
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Tanasko Tasić, Roman Flegar, Uroš Palmin, Aleksander Premuš, Matjaž Urleb, Goran Grgić
Monitoring the metrology system in a country with distributed metrological facilities is impossible without appropriate informational infrastructure. Many parties are interested in clear and transparent information (i.e. national testing, calibration and verification facilities and capabilities, legally approved measuring instruments and their metrological status, metrological regulations and certificates) In the following paper the system of metrological databases for monitoring the metrological system of the Republic of Slovenia is presented.
XVIII IMEKO World Congress
· TC21
· 2006
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L.A. Santos, M.L.C.C. Reis, O.A.F. Mello, L.G. Mezzalira
The uncertainty propagation in the calibration of single normal hot-wire anemometry probes used in the constant temperature mode is discussed in this paper. The two most used forms of calibration curve (the fourth order polynomial and the King’s law) are considered. The presented discussion is also useful for probes which are more complex than the single normal, such as the single yawed, the X, the V-shaped, the triple- and the four-wire probes. The uncertainties discussed here are important in mean flow velocity, and the discussion developed provides a notable opportunity to review some...
XVIII IMEKO World Congress
· TC21
· 2006
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Mladen Banović, Samir Keitoue
Remote access is a very important capability of a condition monitoring system. There are several types of solutions for remote access, and currently the most dominant ones are based on Web technologies. Evaluation of a Web server based solution, and a solution based on a program for remote control, resulted in low performance, especially over low bandwidth communication link. This has encouraged development of an alternative solution which is presented in this paper. The solution is built on a special TCP based protocol integrated into the monitoring applications and tested over a low...
XVIII IMEKO World Congress
· TC21
· 2006
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Miroslav Matýsek, Milan Adámek, Petr Neumann
With regard to repeated assaults from Internet area on Linux servers where the monitoring and controlling system based on the TCP/IP protocol has been debugged and tested, there was designed and applied an effective firewall based on packet filtering for those servers. This firewall is able to defend the Linux server against most common attacks. Our own Linux distribution based on Debian/GNU distribution was designed and debugged. This distribution is loadable from a CD or a compact flash memory in case of an unfiltered Internet attack.
XVIII IMEKO World Congress
· TC21
· 2006
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