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Page 834 of 936 Results 8331 - 8340 of 9356

F. Corrêa Alegria, A. Cruz Serra
UNCERTAINTY OF ESTIMATES OBTAINED WITH THE HISTOGRAM TEST OF ADCS

We present here expressions to determine the uncertainty interval of the estimates of transition voltages and code bin widths of an analogue to digital converter obtained with the Standard Histogram Test. We consider the presence of additive noise as it influences the precision and causes a bias on the test results.

Daniel Belega, Dominique Dallet
DYNAMIC CHARACTERIZATION OF A/D CONVERTERS BY RAMP TESTING SIGNALS

In this paper a method for evaluation the dynamic performances of an analog-to-digital converter (ADC) by ramp testing signals is proposed. This method permits the estimation with high accuracy of ones of the most important dynamic parameters of an ADC – signal-to-noise and distortion ratio (SINAD) and effective number of bits (ENOB). Carried out simulations confirm that the proposed method leads to accurate results.

Leo Van Biesen, Tamás Kemény, Dirk Röske
FUTURE DEVELOPMENT OF IMEKO CONCERNING NON-GOVERNMENTAL COOPERATION IN MEASUREMENT AND INSTRUMENTATION

IMEKO is a non-governmental federation of 35 national Member Organisations, individually concerned with the advancement of measurement technology and instrument engineering. The Member Organisations are scientific/technical societies or committees. The membership consists of the representatives of metrological institutions, higher education, industry and the users of instruments. The paper deals with the objectives of the Confederation, informs on the structure and financial background, on IMEKO imeko_proceedings and on the activities of 21 active Technical Committees. Finally, the future World Congress, different scientific services, membership development, events and co-sponsorships are discussed.

Robert J. Hocken, Mark L. Schattenburg
NEEDS AND ADVANCES IN METROLOGY FOR PRECISION MOTION CONTROL IN MECHATRONICS

Precision mechatronics are essential for the future manufacturing of nano devices and systems. Without accurate means to pattern, assemble, image and measure nano structures, we will be unable to meet the challenges of the next decade. In this paper we discuss the current state-of-theart in metrology used for motion control systems and make suggestions regarding possible future technologies that might improve the situation. What is required is a method to reduce the errors in stage position measurement which is currently interferometric on most production machines. The limitations of this technology are discussed as well as an alternative of using nano gratings to replace the interferometry.

Dieter Barschdorff
INFORMATION PROCESSING OF BIOMEDICAL SENSOR SIGNATURES FOR ENSURING THE QUALITY OF LIFE

New intelligent and miniaturized sensors for physiological parameters, frequently increasing computer performance and an information exchange via wireless networks and Bluetooth modules are supporting remote patient monitoring concepts. Moreover, advanced signature analysis and adaptive decision algorithms make innovative diagnostic tools possible for physicians. These developments are useful for patients living at home during rehabilitation and for chronically ill or handicapped persons. The new systems are discussed on the basis of our experience in sleep laboratory remote patient monitoring. Advanced measurement concepts contribute to ensuring the quality of life.

Francesco Righini
THE WORLD OF SUBSECOND THERMOPHYSICS

The measurement techniques developed in the last thirty-five years for the accurate measurement of thermophysical properties at high temperatures (800-3700 K) using subsecond current-heating are reviewed. Only experiments of total duration around 1 s are considered, with data acquisition performed at the sub-millisecond level. Emphasis is placed on the physics of the different techniques, as developed in major national measurement institutes around the world. A complete survey is provided, covering multiproperty experiments, extensions to thermal expansion and thermal conductivity and measurements at the melting point. An intercomparison of experimental results available in the literature provides an indirect evaluation of the validity of these techniques.

Wolfgang Buck, Bernd Fellmuth, Joachim Fischer, Christof Gaiser, Joachim Seidel
NEW DEFINITION OF THE KELVIN

The current definition of the kelvin refers to a property of a special substance, the triple-point temperature of water. However, the stability of triple point realisations in space and time and the agreement between different cells can not be warranted as shown by experimental indications. Therefore, as a base unit of the SI the kelvin should better be defined by fixing the value of a fundamental constant, a definition already successfully exercised with the metre relying on the speed of light in vacuum. The fundamental constant linked with the kelvin is the Boltzmann constant k, which relates the temperature T to the thermal energy kT. Different methods to determine the Boltzmann constant with sufficient accuracy are reviewed with a view to their present and future limits of uncertainty. Acoustic and dielectricconstant gas thermometry seem to be the most promising candidates, supported by measurements of the total thermal radiation. Finally, a new and universal definition for the kelvin is suggested, including a discussion of its consequences.

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