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In this paper, we present a new knife-edge diffraction method based on Bullington method for the terrestrial line-of-sight (LOS) paths. The diffraction loss of our new knife-edge diffraction method is compared with the results obtained from the Delta-Bullington method and the measurement data existing in the literature for sample fixed terrestrial microwave line-of-sight (LOS)/ non line-of-sight (NLOS)...
Nowadays, nanometer resolution and accuracy in many nanotechnology processes are required. But accuracy is in general opposed with range. High resolution over a wide range has been made possible using interferometric translation stages, in other words by combining metrology with classical mechanical motions. The interferometry is obviously a good solution. Nevertheless, its sensitivity to the medium...
In this study, a helpful approach that provides effective implementation of control objectives for IT (COBIT) compliance processes for organizations is presented. This is based on grouping control objectives according to their relations with each other. For this purpose, an in-depth interview technique was employed as the research method in the study.
We developed a home-made Sample-Holder Unit used for 2D nano-positionning with millimeter traveling ranges. For each displacement axis, the system includes a long range traveling stage and a piezoelectric actuator for accurate positioning. Specific electronics is integrated according to metrological considerations, enhancing the repeatability performances. The aim of this work is to demonstrate that...
Step by step displacements control scheme based on polarimetric interferometer is proposed. A repeatability of 470 pm is obtained on back and forth displacements over micrometer range using piezoelectric actuators. The error induced on the position due to a residual ellipticity of the laser beam is investigated. Such method could be extended over millimeter range displacements leading to numerous...
We developed a home-made sample-holder unit used for 2D nano-positioning with millimeter traveling ranges. For each displacement axis, the system includes a long range traveling stage and a piezoelectric actuator for accurate positioning. Specific electronics is integrated according to metrological considerations, enhancing the repeatability performances. The aim of this work is to demonstrate that...
This paper describes the main progress on the LNE watt balance project since 2004. Development of different parts and structure of the watt balance including starting their assembly are presented.
The magnetic circuit built for the LNE watt balance experiment is now assembled and its characterization is in progress. We describe here the methods used and give the first results.
This paper deals with and details the design and implementation of a low-power; hardware-efficient adaptive self-calibrating image rejection receiver based on blind-source- separation that alleviates the RF analog front-end impairments. Hybrid strength-reduced and re-scheduled data-flow, low-power implementation of the adaptive self-calibration algorithm is developed and its efficiency is demonstrated...
The relation between fires and meteorological parameters, such as wind, temperature and humidity, are investigated in Greece and western and south western parts of Turkey. The study comprises a five - year period between 1993 and 1998 for Greece and 1999 and 2004 for Turkey. The selected areas examined in this study are Achaia (NW Peloponnese) and Crete (Heraklion area) in Greece; and Antalya, Izmir,...
We describe a novel method of velocity control that addresses the measurement requirements of the watt balance projects. The method is based on the use of both a heterodyne Michelson's interferometer and a home-made high frequency phase shifting electronic circuit. Results show that intrinsic relative uncertainty of 10-9 on velocity can be reached with this method over a translation range of 80 mm
A new watt balance project is now developed by the BNM: the general configuration and the main parts of the experimental set-up in development are presented. Its aim is to contribute to the international effort in monitoring the kilogram towards a new definition of the mass unit with an accuracy of 10-8 or better
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