Showing papers by "Marco Parvis published in 2006"

Evaluation of radiation thermal resistances in industrial motors

Abstract: This paper deals with the role of the radiation thermal resistances in industrial motors and describes a test set useful for the resistance evaluation The test set is based on a vacuum chamber and on a numerical acquisition system, and the resistances are obtained by monitoring motor temperatures during a heating test An analytical model that describes how the radiation resistance depends on the motor temperature is also provided Experimental results obtained on a totally enclosed fan-cooled 150-W induction motor are shown and discussed

Handheld-impedance-measurement system with seven-decade capability and potentiostatic function

Abstract: This paper describes design and test of a new impedance-measurement system for nonlinear devices that exhibits a seven-decade range and works down to a frequency of 0.01 Hz. The system is specifically designed for electrochemical measurements, but the proposed architecture can be employed in many other fields where flexible signal generation and analysis are required. The system employs an unconventional signal generator based on two pulsewidth modulation (PWM) oscillators and an autocalibration system that allows uncertainties of less than 3% to be obtained over a range of 1 k/spl Omega/ to 100 G/spl Omega/. A synchronous demodulation processing allows the noise superimposed to the low-amplitude input signals to be made negligible.

A Cryptographic System for Brand Authentication and Material Traceability in the Textile Industry

Abstract: This paper deals with problems of brand authentication and product traceability which are recently affecting the textile market; the continuing increase in the counterfeit production of clothes is heavily revealing the lack of adequate techniques able to assure both the brand authentication of final clothes and the trustworthy of textiles involved in the intermediate manufacturing stages. The signature methods that are currently available are based either on classical labels or on sophisticated textile markers whose reliability lays on the physical irreproducibility of the mark itself. These approaches are either insufficient or too costly to be actually employed; hence this paper presents a new system that is based on cryptographic techniques and which can assure the traceability of the textile during the whole manufacturing process. The proposed solution does not require costly devices, and, even though it is conceived for the textile sector, it can be employed in many other fields as well. A preliminary prototype is described and its capability of working in the presence of noise and material alterations is discussed.

Low-Cost Laser-Based Localization System for Agricultural Machines

Abstract: This paper describes the design and test of a low-cost localization system for agricultural applications, which determines a tractor position in fields up to 0.5 km with an uncertainty of about 1 m. The proposed system employs a standard unmodified laser head, which is commonly used for field leveling, plus a reference ground-fixed laser receiver and requires neither laser modulation nor expensive time-of-flight measurements of light beams

Uncertainty Effects of Data Compression in Measurement Applications

Abstract: Data compression algorithms are widely employed to reduce the amount of data in order to save storage space and to speed-up the data transfer. Lossy algorithms provides high compression ratio but are designed to provide good results mainly when multimedia data are processed. Aim of this paper is to analyze the behavior of commercial lossy and lossless algorithms in the presence of measurement data. The paper also describes a lossy algorithm that has been designed to provide high compression ratios with a known uncertainty level.

Traceability Assurance Of Tele-Measurements

Abstract: This paper deals with the traceability-assurance problems that are faced when a distributed measuring system is employed. These problems are highlighted for different distributed-system architecture, then a set of guide-lines are provided in order to correctly manage such systems from a metrological point of view. The proposed solution is based on a network-assisted calibration procedure, which requires suitable traveling standards that are sent to the nodes of a distributed system under calibration and are remotely controlled through the Internet. A prototype of a traveling standard is also described that has the capability to be synchronized with standards sent to the other nodes.

A Simulation Framework for Rapid Development of Microprocessor Based Measurement Systems

Abstract: This paper describes a framework which can be used to simplify the development of microprocessor based instruments. The framework is based on digital simulators which describe the behavior of the different blocks and a message interchange protocol which allows the simulators to communicate in order to emulate the complete measuring systems. By means of this protocol multiple simple simulators can cooperatively work in situations where microcontrollers and several digital peripherals are present and are requested to exchange digital data.

Traceability Issues in Distributed Measuring Systems

Abstract: This paper deals with the traceability-assurance problems that are faced when a distributed measuring system is employed. These problems are highlighted for different distributed-system architecture, then a set of guidelines is provided in order to correctly manage such systems from a metrological point of view. The proposed solution is based on a network-assisted calibration procedure, which requires suitable travelling standards that are sent to the nodes of a distributed system under calibration and are remotely controlled through the Internet. Two prototypes of travelling standard are also described that have been designed in order to implement the proposed calibration procedure. The first prototype can be used for the calibration of system, which require tight temporal coherence, while the second one is able to calibrate measuring nodes that monitor the chemical pollution.