The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Planar electromagnetic sensors based approach of quality testing of pork belly cuts in a non-invasive and nondestructive way has been proposed in this paper. The sensor is of planar interdigital type. The response of the sensors indicates a good possibility of using this type sensor for the prediction of fat content in pork belly in a non-invasive way. The good response of the sensors at low frequencies...
The method and the required installations for fabricating tapered long-period fiber gratings can be simpler than that of the standard fiber Bragg gratings, and the fabrication process is faster. To our knowledge the fiber-optic tapered long-period fiber grating pressure sensor is presented here for the first time. In this paper the fabrication method for tapered long-period fiber gratings, the sensing...
Four different design options are investigated for a DC-link DC-link DC-link backplane of an inverter. The backplanes interconnect switches and capacitors and have slots at various positions. The purpose is to evaluate the performance of the four topologies regarding parasitic inductance. A probe is developed to measure these low inductances. The probe is powered from a high-frequency source and is...
An experimental study about uncertainty in measurements of conducted emissions of variable speed drives due to variations of operating conditions is presented in this paper. The research is part of a wider experimental program aimed at determining what quantities affect emissions most significantly so that electromagnetic compatibility test procedures are performed under appropriate conditions according...
The paper presents effective algorithms for fast measurement and estimation of the unknown changing frequency and amplitude. The method for emulating coherent sampling with changing signal parameters by the interpolation of the DFT to estimate the frequency and amplitude of the particular component is described. An analysis of errors of the DFT coefficients caused by the frequency variation shows...
In this paper, the system-level implementation of readout and control electronics for a microelectromechanical angular velocity sensor will be presented. The sensor element for which the electronics is designed is a bulk micromachined silicon device with electrostatic detection and excitation. The electronics is divided into two parts, analog and digital. Analog electronics is implemented with a 0...
Self-calibration methods for long-term monitoring of non-electrical quantities are presented in the paper. There have been discussed the self-calibration methods of measurement channels containing integrated ratiometric output sensors and ratiometric output sensors with strong attenuation (bridge circuits). It has been shown that under certain system solutions this type sensors make measurement results...
This paper investigates the performance of genetic optimization in a nonlinear system for active noise control based on Volterra filters. While standard Filtered-X algorithms can converge to local minima, genetic algorithms may handle this problem efficiently. In addition, this class of algorithms does not require the identification of the secondary paths. Computer simulations show that the proposed...
One of the important problems of analog signal processing is to design the filters which possess linear phase characteristics. This paper presents the concept of time–varying Butterworth filters with linear phase response. The compensation of the phase characteristics is carried out with the aid of a phase shifter which is cascade–connected to the structure of the classic Butterworth...
Measurement of electrical bioimpedance enables to characterize a state of tissues/organs, to get diagnostic images, to find hemodynamical parameters, etc. In this paper we consider a digital multichannel bioimpedance analyser developed for monitoring of the state of a working heart. The signal-processing task, which must be solved in this analyser, is described and some proposed alternative algorithmic...
In this paper, we introduce the architecture for implementing a wideband general purpose digital modulator which can generate commonly-used modulation format signals. The symbol rate of modulation signals can be from 500kS/s up to 45MS/s. In order to use the same analog low-pass filters (LPF) to cancel all image signals from D/A converter (DAC) under different output signal bandwidth, we employ Cascaded...
A method of combining auto-regressive (AR) model spectrum estimation with Discrete Flourier Transform (DFT), is presented to analyze and process the output signals of Coriolis mass flowmeter in this paper. This method accurately measures the frequency of signals containing noise through AR spectrum estimation, and then revises sampling frequency according to this frequency. Based on frequency spectrum...
This paper presents an automatic alignment procedure for a 4-Source Photometric Stereo technique to reconstruct the depth map in the Scanning Electron Microscopy. PS, based on the so-called reflectance map, used several images of a surface to estimate the surface depth at each image point. Lambertian reflectivity function is the simplest one. In the SEM one of the most important signals, the Backscattered...
In this paper, important enhancements to a wireless instrumentation bus based, on BlueTooth (BT) standard, are presented. They concern with the realization of a slave BlueTooth module for USB devices and the possibility to control the wireless instrumentation bus via remote Ethernet controllers. In the paper wide descriptions of the realized improvements are presented. Finally results of the whole...
The result of a system identification experiment is usually a parametric continuous-time (s-domain) or discrete-time (z-domain) model. Due to noise on the measurements and/or nonlinear distortions this model can be unstable. If an additional delay is added to the unstable system then experience shows that a stable approximation with small approximation error can be obtained [1], [4], [5], [6]. In...
The paper analyzes a set of DAC time domain specifications including DAC settling time, rise time and fall time, glitch energy. Some useful comments are provided in order to highlight ambiguity in the mostly used definitions and new definitions are suggested when it is necessary.
Double frequency tests are used for evaluating stator windings analyzing the temperature. Likewise, signal injection on induction machines is used on sensorless motor control fields to find out the rotor position. Motor Current Signature Analysis (MCSA) is the most widely used method for identifying faults in Induction Motors. MCSA focuses its efforts on the spectral analysis of stator current. Motor...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.