M. Kowalewski, G. Lentka
REMOTE MONITORING SYSTEM FOR IMPEDANCE SPECTROSCOPY USING WIRELESS SENSOR NETWORK

The architecture of a miniaturized impedance analyser with wireless communication module for remote Impedance Spectroscopy (IS) of anticorrosion coatings on difficult-to-reach objects (e.g. on the steel construction of the bridge) is described in this paper. Some practical aspects of implementation of a Wireless Sensor Network (WSN) are also discussed. A low scale, middle range, WSN network composed of a Base Station (BS) with a Personal Computer (PC) and nodes with impedance analysers fit with Atmel ZigBee modules was simulated in MATLAB. Effectiveness of different routing protocols in an ad-hoc WSN was studied.

Ademir Martins de França, Danielli Guimarães Costa, Luiz Napoleão Pereira, Marco Aurélio Soares, Patrícia Cals de O. Vitorio, Paulo Roberto Mesquita Nascimento
LOW FREQUENCY MAGNETIC FLUX DENSITY METER CALIBRATION

This paper shows the basic grounds for meter calibration services of magnetic flux density at low frequency, made available by the Instituto Nacional de Metrologia, Qualidade e Tecnologia (National Institute of Metrology, Quality and Technology) – Inmetro / Brazil.

S. Rapuano, E. Balestrieri, P. Daponte, L. De Vito
EXPERIMENTAL INVESTIGATION ON DAC GLITCH MEASUREMENT

The paper is aimed at experimentally analyzing the different DAC glitch definitions and measurement methods proposed in literature and adopted by manufacturers. Unfortunately, in fact, there is no universally accepted and unambiguous definition of a glitch. Therefore, the presented research work can give contributions and ideas for discussions focused to solve this problem and develop a new standard dealing with DAC terminology and test methods. An experimental analysis has been carried out and the obtained results have been critically analyzed to provide possible indications for the definition of a univocal and reproducible glitch measurement method.

H. Kato, H. Imai
UNCERTAINTY EVALUATION FOR THE COMPOSITE ERROR OF ENERGY METER AND INSTRUMENT TRANSFORMER

Japan Electric Meters Inspection Corporation (JEMIC) is a Designated Institute of power and energy standards in Japan. All the energy meters for electricity trading in Japan are traceable to the National Standard in JEMIC. In industrial world, power is supplied by various voltage and current. However, the energy standard has been calibrated at 110 V and 100 V, for 5 A. Therefore, it is often used in combine with the instrument transformer. This paper describes the effect of composite error of instrument transformers to uncertainty evaluation of energy meters.

Piotr Bilski, Wieslaw Winiecki
POSITION-BASED QUANTUM CRYPTOGRAPHY IN THE DISTRIBUTED MEASUREMENT SYSTEM

The paper presents the analysis of a secure transmission channel between nodes in the distributed measurement system. Its security is discussed, using the position-based scheme, where each node is authenticated based on its geographical position. To decrease the threat of the adversary disguising as the authorized node and eavesdropping the transmission, the quantum cryptography scheme is used. The paper presents the modifications and practical implementation issues of such a communication scheme in the distributed measurement system. Time measurement accuracy and clock synchronization are considered, as well as technical difficulties in delivering the secure quantum channel in the open space.