Alejandro Savarin, Carlo Marinari, Jorge C. Torres-Guzmán
In order to improve the metrological characteristics of the 110 kN INTI primary Force Standard Machine (FSM), an evaluation of the parasitic components that could rise for misalignments and structural deformations, is useful. The values of the parasitic components in static and dynamic conditions were determined by using the six-component dynamometer property of CENAM. On the basis of the multi-component analysis and in order to reduce the effect of the parasitic components on the main axial load, a verification of the main frame inclination, of the load eccentricity and of the weight pieces...
XIX IMEKO World Congress
· TC3
· 2009
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Marcantonio Catelani, Andrea Zanobini, Lorenzo Ciani
The word error rate (WER) in an Analog to Digital Converter (ADC) is the probability to receive a wrong code for an input, after correction is made for gain, offset, and nonlinearity errors, and a specified allowance is made for noise. Typical causes of word errors are metastability and timing jitter of comparators within the ADC. The proposed paper is an evolution of previous work and focuses the attention to the word error rate estimation and to the Annex A of IEEE standard 1241. Other statistical techniques, which can better integrate what is sustained in the standard and in [2], have...
XIX IMEKO World Congress
· TC4
· 2009
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Sascha Eichstädt, Alfred Link, Meinhard Spitzer, Mark Bieler, Clemens Elster
We show that correlations in the estimate of the impulse response of ultrafast sampling oscilloscopes might play an important role for uncertainty evaluations. This is demonstrated by determining the uncertainty associated with the estimate of the oscilloscope's input signal which is calculated using the output signal of the oscilloscope and the impulse response. We observe that the resulting uncertainty depends on the size of the correlation in the impulse response and we conclude that such correlations should be accounted for in an uncertainty analysis.
XIX IMEKO World Congress
· TC4
· 2009
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Wan-Sup Cheung, Torben Licht
This paper addresses technical challenges unresolved in the calibration of angular vibration pickups. Primary and/or comparison calibration systems for angular vibration pickups can not be realised without the angular vibration exciter and the precision angular accelerometer suitable for the transfer standard. Recent attempts made to tackle these technical challenges and related achievements are introduced in this paper. Several air-bearing supported angular exciters had been machined and tested to improve their background angular vibration levels and instability conditions due to...
XIX IMEKO World Congress
· TC22
· 2009
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Masaki Michihata, Daisuke Nakai, Terutake Hayashi, Yasuhiro Takaya
We propose a new dimensional measurement technique that is capable of measuring the bottom surface of a stepwise shape. The measurement system is composed of a length scale and a sensor probe to read the scale. The probe is trapped and controlled three-dimensionally by laser trapping technique. The scale is arisen by optical interference, which is extended straight to the measured surface from the probe. Firstly measurement principle is theoretically explained. Remarkable feature of this technique is feasibility to access the area as narrow as 15 µm. Vertical resolution of this measurement...
XIX IMEKO World Congress
· TC14
· 2009
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Hiroshi Yamasaki, Hiroyuki Kambara, Yasuharu Koike
The purpose of this study was to clarify the criterion which can predict trajectories during sit-to-stand (STS) movement. Three types of rising movements from the chair, i.e., upright, natural, and leaning-forward rising, were measured for five subjects. The trajectories of the center of mass (COM) predicted by the minimum torque-change model, rather than the minimum jerk model, resemble the measured movements in all rising patterns. The upright rising required greater extension torque of the knee and ankle joints at seat-off. The leaning-forward rising required greater extension hip torque...
XIX IMEKO World Congress
· TC18
· 2009
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Po Gyu Park, Young Gyun Kim, Wan-Seop Kim, V. N. Kalabin, Vladlen Ya. Shifirn
A precision generating and measurement system of AC magnetic flux density was developed by using a linear low-frequency AC magnetic field converter, a quartz Helmholtz coil, a voltage comparator, a multimeter, a standard resistor, and a computer with a program for automatic measurement. The expanded uncertainty ( k = 2) of the calibration system is less than 0.2 % over the frequency range of 1 Hz to 20 kHz.
XIX IMEKO World Congress
· TC4
· 2009
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Piotr Bilski, Wieslaw Winiecki
The paper presents the implementation of the Advanced Encryption Algorithm (AES) in the measurement system, where the virtual instruments equipped with the multi-core processors are used. The encryption algorithm is first presented, then its modification to take advantage over the multi-core processor is described. Implementation of the latter in the virtual instrument working under the Real-Time (RT) mode is presented. Finally, test vectors are used to verify the validity of the modified algorithm and comparison between the traditional algorithm and the version using the parallel...
XIX IMEKO World Congress
· TC4
· 2009
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Pierre Cambier, S. Vandermarlière, Ernst von Lavante, U. Banaszak, H. Krisch, Sylvain Tournillon
In the present investigation, the problem of accurate determination of volumetric flows by means of the so-called vortex-shedding flow meter in the case of upstream disturbances caused by several versions of bends has been studied. To this end, the flow about the bluff body used in the presently studied vortex-shedding flow meter was investigated experimentally and numerically for the case of incompressible fluid flow (water). The disturbances considered presently were generated by a single 90-degree bend, in-plane double bend and a three-dimensional 90-degree out-of-plane double bend....
XIX IMEKO World Congress
· TC9
· 2009
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Vladimir Kneller
The paper presents a procedure enabling to reveal and systematize the techniques of purposeful process realization by classifying verbally described concept reflecting this process per general/particular principle. The focus is made on "generic" methods revelation mechanism. The procedure is exemplified in the revealing general methods of quantities transformation: the process underlying many other processes including measurement, inspection, and control. The picture of the upper classification levels of general transformation methods is drawn up and can be further developed with reference...
XIX IMEKO World Congress
· TC7
· 2009
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