IMEKO Event Proceedings

Page 6 of 748 Results 51 - 60 of 7479

Matteo Parenti, Andrea Boni, Davide Vescovi
A 6-b 1Gsample/s SiGe BiCMOS A/D Converter

The paper describes the design of a 1GS/s 6-bit ADC in SiGe BiCMOS technology. Several techniques such as subranging, interpolation and averaging were implemented on the original flash architecture in order to achieve low power consumption without sacrificing linearity and dynamic performance.

Bruno Da Silva, Stephane Bosse, Severin Barth, Steve Torchinsky
A 6-bit 3GS/s FLASH ADC IN BIPOLAR 0.25 µm FOR THE RADIOTELESCOPE SKA

A flash Analog to Digital Converter (ADC) at 3 Giga samples per second (GS/s) was developed using QUBIC4X which is a 0.25 µm SiGeC process from NXP Semiconductors. The ADC has a bandwidth close to 1.2 GHz with a resolution of 6-bit. The full design employs a differential structure. The ADC uses a parallel architecture consisting of the following components: track and hold, comparators, and a fat tree encoder. An embedded test system will help us to validate the data transmission, and it is made by a Linear Feedback Shift Register (LFSR). An additive scrambler block allowed us to transmit the data without an accompanying clock signal. The core of the digital circuit is in Emitter-Coupled Logic (ECL). The input is adapted to 100 Ω differential, and the outputs use standard Low Voltage Differential Signaling (LVDS). The input voltage range is about 0.5 Volts. The complete system has a power consumption of 2.6 Watts and the Effective Number of Bits (ENOB) is higher than 4.4 at 1490 MHz.

Li Wansheng, Li Qingzhong, Zhao Yucheng, Sun Yunhai, Wang Jianguo
A 60 MN Build-Up Force Transfer System

The paper described principle, construction and main specifications of a 60 MN force transfer system (FTS), which is used to transfer or calibrate large force over 20 MN, and to do inter-comparison of force standards. The paper has raised additional budget of its connecting to uncertainty of the force measured by the FTS, and non-uniformity of force applied on the FTS.

Alberto Ramil, Ana J. López, J. Santiago Pozo-Antonio, Teresa Rivas
A backpropagation ANN algorithm based on RGB images for the identification of granite-forming minerals

Granite is a rock widely used in the built Cultural Heritage in the NW of Iberian Peninsula. Nowadays, one of the most studied cleaning procedure of the built Cultural Heritage is the laser application because it is gradual and selective. Considering the laser cleaning of granite, it is of great interest to perform the identification of the forming-minerals in the stone surface in order to avoid damage due to the overexposure, improving the treatment results. The aim of this work is the optimization of a back propagation artificial neural network in order to obtain rapid and reliable identification of formingminerals in granitic stones by means of RGB images. Our goal is, eventually, in-situ monitor the laser cleaning of granite stoneworks. The artificial neural network results obtained were compared with the results of the modal analysis and it was detected a high degree of correct identification of the minerals.

P. Arpaia,P. Cimmino, E. De Matteis, G. D’Addio
A BALANCE BOARD DEVICE FOR HOME CARE TELEREHABILITATION EXERGAMING

A prototype of a low-cost balance board for exergaming-based tele-rehabilitation systems is introduced. The objective is to extend at patient’s home the interactive nature of the individualized rehabilitation therapies traditionally carried out at clinic. Preliminary results on posturographic tests showed encouraging performance.

Mitsuo Matsuda, Takahiro Arita, Susumu Sakano
A BASIC RESEARCH FOR DISCRIMINATION OF LIVING BODY TISSUES USING TACTILE SENSOR

It is dispensable to develop the discriminating method of the human body tissues for the automation of the operation using robots. The piezoelectric elements are used as the sensor to measure the qualities of the living body. The discrimination for various meats as the living body is tried using the developed tactile sensor. It is shown that the discrimination among the living tissues is possible using the proposed tactile sensor.

E. Lunca, C. Donciu, M. Cretu, A. Salceanu
A Basic Virtual Test System for EMI/RFI Problems

The paper presents a virtual system for locating and measuring near-field electromagnetic emissions in the frequency bandwidth from 100 kHz to 500 MHz. The implemented software controls the test equipment and performs both E and H-field strength measurements. The virtual system is not intended to verify compliance with international emission regulations. However, it is helpful in characterizing the abnormal electromagnetic fields and in extracting frequency and time domain information.

Marcel Reginatto, Andreas Zimbal
A BAYESIAN ANALYSIS TO EVALUATE THE NEUTRON RESPONSE OF A LIQUID SCINTILLATION SPECTROMETER

Many problems in neutron metrology require the determination of spectral neutron fluence rates. One of the prerequisites for doing spectrometry is the knowledge of the detector’s response function. We report on a method to determine the response function of liquid scintillation spectrometers given measurements in monoenergetic neutron fields. The response function is modelled using radial basis functions and the parameters of the model are chosen using Bayesian parameter estimation.

Shaochun Tang, Shubin Liu, Xinjun Hao, Weihao Wu, Lei Zhao, Qi An,
A BEAM PHASE AND ENERGY MEASUREMENT SYSTEM BASED ON DIRECT RF SIGNAL IQ UNDERSAMPLING TECHNOLOGY

A diagnostic system being designed to measure the beam phase and energy of the Drift Tube Linac (DTL) in the Proton Accelerator of China Spallation Neutron Source (CSNS) is described and the characterization of the prototype is presented. The signals received from Fast Current Transformers (FCTs) are Radio Frequency (RF) signals with the frequency up to 350 MHz and a dynamic range of -30 dBm to 3.5 dBm. The RF signals are converted to orthogonal streams directly with the In-phase and Quadrature-phase (IQ) undersampling technique based on high-speed high-resolution A/D conversion. Thus a high quality sampling clock system is indispensable. Two different clock systems are implemented and tested for comparison. All Digital Signal Processing (DSP) algorithms are implemented in one single FPGA, meanwhile a Nios II embedded system is also integrated in it for data transfer through the Ethernet. This system achieves a phase resolution better than 0.07 degree over the input signal amplitude range of -41 dBm to 7 dBm.

Hubert Zangl, Stefan Cermak, Bernhard Brandstätter, Gerald Gruber, Georg Brasseur
A BEM-APPROACH FOR SIMULATION AND OPTIMIZATION OF CAPACITIVE SENSOR TOPOLOGIES

In order to optimize front-end topologies of capacitive sensors precise knowledge of the coupling capacitances is important. These capacitances are not easily accessible by means of measurement without significantly altering them, and therefore a numeric method for determining them is advantageous. In this paper we use a Boundary element formulation for this task. Certain aspects of numerical accuracy of the formulation used are addressed. Results from simulations and optimizations are presented and compared with experimental results for validation of the approach.

Page 6 of 748 Results 51 - 60 of 7479