IMEKO Event Proceedings

Page 9 of 812 Results 81 - 90 of 8114

Halina Nieciag, Zbigniew Chuchro
A CERTAIN METHOD FOR CHEBYSHEV APPROXIMATION USED IN IOS METROLOGICAL SOFTWARE

The paper presents a method that is an attempt to solve the problem of non-linear approximation of geometrical elements according to Chebyshev norm. On the base of general two step algorithm it performs an evaluation of minimal deviation from maximal values of measured shapes driving to the optimal solution on the iterative way. The proposed method implemented for some geometric features has been verified for a many samples of simulated and measured datapoints.

Fabio Leccese
A CHEAP WI-FI INSTRUMENTATION REMOTE CONTROL PLATFORM FOR ELECTRIC AND ELECTRONIC DIDACTIC LABORATORY

Remote control of instrumentations and the connected measurement techniques represent an interesting topic particularly appreciated in some sectors as industry, research and e-learning. The current technologies allow to fully control modern instrumentation that is already conceived for this aim, while it is harder to manage old instrumentation not specifically designed for this kind of control. At the moment the costs are strongly conditioned by the current architecture that uses a personal computer as local server to manage the local instrumentations making impossible a really common use of these technologies. In this paper a system for remote controlling instrumentations implementing IEEE 488 or otherwise, based on an economic Wi-fi architecture, is described.

Yongping Han, Shahin Mehdizad Taleie, Tino Copani, Bertan Bakkaloglu, Sayfe Kiaei
A CMOS 1.5-Bit ΣΔ DIGITAL IF TO RF TRANSMITTER FOR WCDMA APPLICATION

A digital intermediate frequency (IF) to RF transmitter targeted for 2 GHz wideband code division multiple access (WCDMA) is presented. The proposed transmitter integrates a 3-level digital IF current-steering cell, an up-conversion mixer with a tuned load and an RF variable gain amplifier (RF VGA) with an embedded semidigital finite impulse response (FIR) reconstruction filter. A 4th-order 1.5-b IF bandpass sigma delta modulator (BP ΣΔM) is designed to guarantee in-band signal-to-noise ratio (SNR) and error vector magnitude (EVM) performances while the out-of-band quantization noise due to noise shaping is suppressed by the embedded FIR reconstruction filter to meet spectrum emission mask and ACPR requirements. The on-chip RF VGA provides 50 dB power scaling in 10-dB steps with less than 1 dB gain error. Together with the power control at the ΣΔM stage, the 74-dB dynamic range at RF frequency is achieved. The design is fabricated in a 4-metal 0.18-µm CMOS technology with a total core area of 0.8 × 1.6 mm². The IC delivers 0 dBm output power to the 50 Ω load at 2 GHz and it draws approximately 120 mA from a 1.8 V DC supply at the maximum output power.

Dr. O. Vdovin, Dr. V. Martynyuk, Prof. M. Surdu
A COMBINED METHOD FOR MEASURING SUPER-HIGH CAPACITORS ABSORPTION CHARACTERISTICS

The paper is devoted to measuring of super-high capacitor energy characteristics with direct current. The authors investigated the mathematical models of super-high capacitors with direct current stable source and proposed new combined method and variation-current method for measuring energy characteristics of super-high capacitors.

Y. Toyoda, T. Seo, T. Iuchi
A COMBINED METHOD OF NONCONTACT TEMPERATURE MEASUREMENT FOR SILICON WAFERS

This paper presents a non-contact temperature measurement method for silicon wafers with combined utilization of transmittance technique at low temperature and radiation thermometry at high temperature because wafers are semitransparent at temperatures less than 600 °C and opaque at more than that. In this method, we utilize polarization technique and the Brewster angle between air and dielectric films that are grown on silicon wafers. The measurements are performed at the same geometrical arrangement and unaffected by dielectric film thicknesses. As a result, the combined method is widely applicable at temperatures from room to more than 1000 °C for silicon wafers.

Yufan Ding, Jose Mirao, Pedro Redol, Luis Dias, Patricia Moita, Emma Angelini, Sabrina Grassini, Nicola Schiavon
A combined petrographic and geochemical metrological approach to assess the provenance of the building limestone used in the Batalha Monastery (Portugal)

To verify the provenances of limestones that were used for construction and restoration of the Batalha Monastery, limestone quarries in central Portugal were investigated. Samples were collected from quarries and monastery in field investigation. The elements-alignment of calcium and strontium based on XRF result has suggested the source of fragments from different parts the monastery. Observation of the thin sections has supplemented petrographic evidence for this identification. XRD, TGA were also used for acquiring mineral information and chemical composition of the stones. This origin tracing result supplies foundation for further research of stone decay and reservation of the Batalha Monastery.

Ausilio Ernesto, Zimmaro Paolo
A combined technique approach for the study of a landslide in the Calabria region

In the detection and monitoring of a landslide a large number of variables should be taken into account. Several techniques and approaches should be used to fully understand the phenomenon in order to facilitate landslide stabilization design especially for complex cases. In this paper the case history of the Gimigliano landslide (Southern Italy) is investigated taking advantage of a combinedtechnique approach based on conventional geotechnical measurements used together with modern technologies such as electromagnetic sensing techniques and electrical resistivity tomography. The application of this methodology shows that combining the information taken from the different techniques is possible to validate the measurements obtained by conventional and modern approaches and enhance the accuracy of each other.

Alessia Bramanti, Alessandro Sciva, Giuseppe Campobello, Pier Paolo Capra, Silvia Marino, Placido Bramanti, Nicola Donato
A compact monitoring system for patients affected by neurodegenerative diseases

In this paper we report about the development of a compact monitoring system for people affected by neurodegenerative diseases as Parkinson and Alzheimer. The electronic interface is based on a Linkit ONE development board, and it is equipped with an array of up to four ADXL345 accelerometers. By considering the main symptoms of Parkinson subjects, it is possible to monitor tremors/movements and accidental falls of people wearing the system and to send data to a supervisor by Wi-Fi, Bluetooth and GSM connections. Furthermore, the geo-tagging functions, developed by means of a GPS feature, already equipped in the board, allow the monitoring of the movements and the position of Alzheimer subjects, avoiding the lost for memory failures.

Giovanni Betta, Domenico Capriglione, Claudio De Capua, Carmine Landi
A COMPARATIVE ANALYSIS IN TERMS OF CONDUCTED SUSCEPTIBILITY OF PC-BASED DATA ACQUISITION SYSTEMS

In this paper, a performance comparison between PC-based data acquisition systems is carried out with reference to their immunity to electromagnetic conducted disturbances. The aim is to identify suitable measurement procedures at present not available both in the literature and in EMC standards. The data acquisition system (personal computer and data acquisition board) is approached as a whole system and subjected to the more relevant conducted interference considered by EN standards, electrical fast transient and noise by conducted radio frequency field. Experimental tests, carried out in a shielded environment, highlight the relevance of a specific EMI characterisation of this apparatus.

Claudio De Capua, Emilia Romeo
A COMPARATIVE ANALYSIS OF FUZZY T-NORM APPROACHES TO THE MEASUREMENT UNCERTAINTY EVALUATION

The demands of statistical investigations in measurements inspired the remarkable development of probabilistic methods. However, the probability theory didn’t prove to be fully adequate for all types of uncertainty. Probability theory is excellent if the ambiguity is to be modelled, but its attempts to describe vagueness is quite inconsistent with common sense. Fuzzy theorists have often argued that a major motive behind the theory of fuzzy sets has been the treatment of uncertainty. In particular way, it’s well accepted that a measurement result (no matter what kind of instruments we are using in our process) is just a number which is only known to lie within an interval, and this is the reason for which fuzzy sets can be successfully applied. To consider both systematic and random effect of measurement operation, in agreement with [4], we have chosen to use Random Fuzzy Variables, proposing to describe the correlation or interaction of repeated measurements by triangular norm based arithmetics.

Page 9 of 812 Results 81 - 90 of 8114