9762 papers found
This paper describes a new solution for metrological calibration of the instruments. This solution consists of realizing an automated video system, for data video-acquisition, image processing and digital command, used for various equipments, so that the tests and the calibration can be automatically made.
Actually, quasidigital sensors are become very important in noisy environments. In order to learn how quasidigital sensor works, the target of this paper is to design a data acquisition system based on a computer and a PCI (NI Pci-6221) data acquisition board to acquire data from SMT160 quasidigital temperature sensor using the ELVIS platform and Labview as a language programming software. In addition the Universal Transducer Interface from Smartec will be evaluated as an analog to frequency converter for resistive and capacitive sensors. The objective of this present paper is to study and...
In this paper we present different techniques for measuring the electromagnetic shielding effectiveness of the materials. A comparative study regarding the advantages and the limits of these methods in electromagnetic characterization of advanced materials for shielding purpose is considered. Additionally, the possibility to separate the contribution of absorption and reflection properties of these materials to the total shielding effectiveness was investigated.
This paper is focused on how to implement a nonlinear voltage divider used in the electrical power network disturbances measurement system preconditioning circuit. The voltages acquired from the electrical power network have amplitudes between 0.2 kV and 10 kV, values which are very high for an acquisition board. These amplitudes must be reduced to the values accepted by the acquisition boards: ±10V. If the signal from the electrical power network is divided with a linear voltage divider, the smaller variations around the nominal values of the voltage on the electrical power network can not...
Alternatives to the conventional sine wave excitation in the impedance measurement technologies are studied in this paper. Measurements can be performed much faster when broadband excitation signal is applied. Using of sinc and Gaussian functions, also modifications of sinc pulses are considered. Beside the traditional sine wave and rectangular pulse excitations the carefully designed pulse wave excitation can become to a serious alternative, especially when the wide frequency range measurements, exact timing, and low energy consumption are required (laboratories on the chip, implantable and...
Sugestive for this paper is the students’ expression that says „the first 6 years are difficult until you reach the third school year”. And the rhymes are not very far from the truth. In this moment the curriculum sets for the first two years only fundamental courses as: math, physics, mechanics, electronics, computer programming. In the last two or three years there are special courses, that are meant to transform the good theoretical base student into an inventive and skilful engineer. The partition of the education process in two separate successive stages: base preparation and technical...
This paper describes an application called server emulator. It is one part of the system for remote measurement. The system is based on the server-client communication structure over the Internet.
The way of measurement of low frequency electromagnetic field intensity is presented. Computer measurement system is described, which can be used for RMS value isotropic measurement and recording of electric and magnetic components of electromagnetic field time waveforms. Later the off-line time-frequency analysis of the recorded signals can be done. Selected results of measurements made onboard Gdynia Maritime University research-training vessel are performed.
The time stamp service is a network time service providing time stamp to a specific byte sequence sent to a time stamp authority/ appliance (TSA). The accuracy of the provided time stamp shall be specified by the TSA and should be calibrated. This paper discusses methods for calibration of TSA using a calibration computer and taking into account the impact of the network. The methods have been tested on an experimental TSA placed in different distances from the calibration computer and in different networks.
In this article we describe the remote driving, via Internet, of the ultrasound sensor that can work in two different ways, for locating and sizing isolated scatterers and for ultrasonic ranging by real-time digital phase measurements. The sensor is located in the laboratory of Electrical Measurements of the Technical University of Iasi, Romania, while the remote control is located in the BioMechatronics Laboratory of the University of Magna Græcia at Catanzaro, Italy.