Mark I. Schiefer
This paper will discuss a newly developed implementation of ISO 16063 style primary accelerometer calibrations. The goal is a laser primary accelerometer calibration system capable of performing low uncertainty primary accelerometer calibrations while maintaining the throughput and simplicity of a traditional back-to-back calibration system. Primary accelerometer calibrations typically require multiple measurement passes at several locations across the device to be calibrated by primary means. This paper discloses the novel use of a dual beam, simultaneous primary calibration laser...
Cultivating metrological knowledge
· TC22
· 2007
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S. Rusnáková, P. Koštial, D. Bakošová, J. Kucerova, M. Mokryšová
Fibre-reinforced components of various shapes and different boundary conditions (free, clamped, and hinged) commonly occur in practice. Designers need to be able to predict the stiffness parameters and damping values of such components for conditions such as aeroelasticity, acoustic fatigue, and so on. Electronic speckle pattern interferometry (ESPI) can be useful tool for easily determination of Poisson’s ratio, Young's modulus E and shear modulus G from the measured resonant frequencies. In this study we investigate the vibration behaviour of square composite plates with different stacking...
Cultivating metrological knowledge
· TC22
· 2007
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P. RATTANANGKUL, B. THUMMAWUT, V. PLANGSANGMAS,A. OHTA, T. USUDA
The Bilateral Comparison between National Institute of Metrology (Thailand), NIMT and National Metrology Institute of Japan, (NMIJ) was conducted in order to confirm the capability of NIMT. The calibration of charge sensitivity of the accelerometer was carried by interferometry method according to ISO 16063-11. The calibration results were then compared at the frequency range of 50Hz to 5000Hz. The reference standard accelerometer Bruel & Kjaer 8305 was assigned as the artifact. The calibration methods of NMIJ were according to the Fringe-Counting Method at the frequency range of 20 Hz – 80...
Cultivating metrological knowledge
· TC22
· 2007
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Gustavo P. Ripper, Guillermo Silva-Pineda
A bilateral key comparison was conducted in the area of vibration between the National Institute of Metrology, Standardization and Industrial Quality (INMETRO), Brazil and the Centro Nacional de Metrología (CENAM), in Mexico; with INMETRO acting as pilot laboratory. This comparison was registered in the BIPM key comparison database (Mutual Recognition Arrangement - Appendix B) as SIM.AUV.V-K1.1 and the measurements were carried out by the participating laboratories from October 2004 to March 2006. The aim of this exercise was to compare primary interferometric measurements of complex charge...
Cultivating metrological knowledge
· TC22
· 2007
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Th. Bruns, C. S.Veldman
During the 18th IMEKO World Congress 2006 in Rio de Janeiro the members of the TC22 discussed the options to validate and compare different algorithms used worldwide by NMIs in the field of primary accelerometer calibration. The goal would be to validate calibration results calculated with the help of reference data sets and compare the different algorithms with data sets including well defined disturbances. This would expose the susceptibility or immunity of the algorithms with respect to signal disturbances. The challenge in such an approach is the multitude of measurement set-ups...
Cultivating metrological knowledge
· TC22
· 2007
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P. Koštial, D. Bakošová, N. Krecmer, M. Mokryšová, S. Rusnáková, J. Kucerová
With help of the ESPI tool we have determined vibration modes of different tyres. In the paper we studied also the influence of the tyre inflation on the vibration mode dynamic. The obtained results were qualitatively compared with those obtained by application of the finite element method (FEM) in the Marc software environment.
Cultivating metrological knowledge
· TC22
· 2007
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Holger Nicklich, Martin Brucke
SPEKTRA is a leading manufacturer of Calibration Systems for vibration and acoustic sensors for use in laboratory applications. Special hardware, software and system concepts have been jointly developed for the mass production of MEMS. Since in sensor production and some metrological applications extreme requirements for sine and shock levels and frequency ranges have to be met, SPEKTRA has decided to design special exciters of their own. The paper will present new designs, measurement results and examples of applications to calibration systems. The extended capabilities of the high...
Cultivating metrological knowledge
· TC22
· 2007
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F. J. Cedillo, R. L. Villeda
The present article has as main objective showing the evolution of a Mexican pressure calibration secondary laboratory based on comparisons. This could be thought to be a reflection of the maturity and metrological culture dissemination from the Centro Nacional de Metrología (Mexican National Centre of Metrology, CENAM). The participation in a total of 10 comparisons through one decade as a secondary laboratory is analyzed in 4 subintervals. Due to the big measurement range covered, from -70 kPa up to 70 000 kPa, to analyzed in only one graph would be a little illustrative.
Cultivating Metrological Knowledge
· TC16
· 2007
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M. Rantanen, S. Semenoja and K. Riski
An inter-comparison in the high oil pressure range was arranged in 2005 – 2007. The participating laboratories were CMI / Czech Republic, Metas / Switzerland, MIKES / Finland, NMi-VSL / The Netherlands, PTB / Germany, SMD / Belgium and SP / Sweden. The transfer standard was a Desgranges & Huot piston-cylinder unit with a nominal effective area of 1,96 mm², mounted in a D&H 5316 balance body. The participants determined the effective area at ten nominal pressures from 50 MPa to 500 MPa in steps of 50 MPa. All the results were in a good agreement with the reference values, calculated as...
Cultivating Metrological Knowledge
· TC16
· 2007
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M. Kojima, K. Saitou and T. Kobata
The indications of some types of differential pressure transducers are affected by the calibration procedure such as pressurization sequence, the line pressure and environmental conditions: it is known that hysteresis, zero drifts and span readings of some transducers depend on those parameters. When the calibrated transducer is used as a working standard in another calibration, therefore, it is necessary to use the same procedure as previous calibration. Otherwise, the calibration results sometimes differ according to the measurement condition. As an example, the different calibration...
Cultivating Metrological Knowledge
· TC16
· 2007
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