Ondrej Šubrt, Miloslav Kubar, Pravoslav Martinek, Jirí Jakovenko
One of the recent approaches to test A/D converter performance is the so-called Servo-Loop Method. This method is aimed at the non-linearity extraction of static ADC transfer curve. In this paper, we prove an advanced Servo-Loop version focusing on behavioral and transistorlevel example of the Residual Signed Digit (RSD) cyclic A/D converter design. The background of the considered Servo-Loop version was proposed. In this paper, we establish a Virtual Testing Environment (VTE) built on Verilog-A implementation of the Servo-Loop unit fully integrated into Cadence design environment. Powerful...
XIX IMEKO World Congress
· TC4
· 2009
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Horst Bettin, Detlef Schiel, Martin Vogtmann, Henning Niemann
The cleaning of silicon density standards was investigated by mass comparison measurements. It was shown that even in clean laboratory air, the mass of silicon spheres increases considerably with time. On the other hand, after cleaning the sphere, mass stabilizes within only 8 hours and always yields the same mass within 10 µg. This is also true after using the spheres in liquids, e. g., for hydrostatic weighing. Additionally, an infrared absorption technique was used to identify hydrocarbons on silicon spheres and to estimate the layer thickness. A calibration of this method was possible...
XIX IMEKO World Congress
· TC3
· 2009
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Falk Tegtmeier, Rolf Kumme, Mark Seidel
Since November 2008, PTB's force scale has been complemented in the range from 2 to 5 MN by a further force standard machine. This automatically working 5 MN Force Standard Machine (FSM) utilizes the hydraulic amplification of a 50 kN mass stack and enables low uncertainties of smaller than 0.01% by using innovative methods for the control principle and the link-up of the force standard. In the paper, the constructional design of the machine, the control and the innovative link-up procedure will be published. Supplementary to this, results from comparison measurements of the machine with...
XIX IMEKO World Congress
· TC3
· 2009
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Hermann Gross, Andreas Rathsfeld, Frank Scholze, Markus Bär
Scatterometry is a non-imaging indirect optical method in wafer metrology to characterize periodic surface structures with dimensions in the micro- and nanometer range. It is also important to lithography masks designed for extreme ultraviolet lithography (EUVL), where light with wavelengths in the range of 13 nm is applied. The solution of the inverse problem, i.e. the determination of periodic surface structures with respect to their critical dimensions (CD) and other profile properties from light diffraction patterns, is incomplete without knowledge of the uncertainties associated with...
XIX IMEKO World Congress
· TC21
· 2009
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Malgorzata Poniatowska, Andrzej Werner
The present paper will present problems connected with accuracy inspection of free-form surfaces, performed with coordinate measuring machines equipped with touch measurement probes. The most important among them are, apart from the number and distribution of measurement points on a surface, errors caused by the probe radius compensation and determining the coordinate system. A theoretical analysis as well as the results of tests on the influence of compensations errors and errors in fitting the data to a CAD model on the results of computation of the points on the milled free-form surface...
XIX IMEKO World Congress
· TC14
· 2009
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Andrzej Werner, Malgorzata Poniatowska
The article presents issues connected with coordinate measurements of spatial surfaces. These measurements are presented on the example of carrying out the reverse engineering process of objects described with the use of free surface patches. The introduction to the article comprises a presentation of the B-spline method. This method has been applied to constructing geometric models of the reconstructed surfaces. Moreover, the introduction presents a method of constructing a surface patch on the basis of a cloud of points in space. Further in the article, a practical implementation of the...
XIX IMEKO World Congress
· TC14
· 2009
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Grzegorz Smigielski, Roman Dygdala, Mieczyslaw Kunz, Damian Lewandowski, Krzysztof Stefanski
The paper describes an outline of a system of precise delivery of water capsule to a given point. Theoretical model of the capsule's flight, the method of numerical computing its trajectory under various limiting conditions and the scheme of the system of acquisition and transmission of the data serving as initial conditions for numerical computation are presented. Results of field experiments verifying theoretical model and numerical methods of computing the trajectory of a water-capsule by comparison of computed and registered trajectories after its release from a helicopter in the...
XIX IMEKO World Congress
· TC19
· 2009
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Kazimierz Józwiak, Marek Olesz, Janusz Smulko
There is a continuous pressure to increase quality of the passive elements at reduction of their production costs. Therefore, present methods of their quality assessment have to be reconsidered to avoid usage of the elements that could break down and lead to serious economical losses. This paper compares results of capacitor tests introduced by the obligatory technical standards and measurements of acoustic emission induced by partial discharges within voids in foil-based capacitors. We suppose that presence of voids within dielectric and foil structures can lead to capacitor damage and can...
XIX IMEKO World Congress
· TC10
· 2009
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Philippe Averlant, Claire Bartoli
The national accelerometry references in France are provided by the LNE. Such traceability to national standards is essential for industrial organisations using processes in which an understanding of acceleration related parameters is of primary importance in terms of quality and safety. These fields include the armaments, nuclear, aerospace and automotive industries. The calibration of reference accelerometers for industries and other laboratories has been carried out on the LNE site at Trappes since 2006, using an absolute method involving a Michelson laser interferometer in accordance...
XIX IMEKO World Congress
· TC22
· 2009
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Alessio De Angelis, John-Olof Nilsson, Isaac Skog, Peter Händel, Paolo Carbone
In this paper, a research activity aimed at developing an indoor positioning system is presented. The realized system prototype uses sensor fusion techniques to combine information from two sources: a local Ultra-Wideband (UWB) radio based distance-measuring system infrastructure and an Inertial Navigation System (INS). The UWB system provides a measure of distance between two transceivers by measuring the time-of-flight of pulses. Its principle of operation is briefly described, together with the main features of its architecture. Furthermore, the main characteristics of the INS and of the...
XIX IMEKO World Congress
· TC4
· 2009
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