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Wyszukujesz frazę "Svatoš, J." wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
Metal detector excited by frequency-swept signal
Autorzy:
Svatoš, J.
Vedral, J.
Fexa, P.
Powiązania:
https://bibliotekanauki.pl/articles/221024.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal detection
polyharmonic signals
Frequency Sweep
modelling of electromagnetic induction
analog signal processing
Opis:
This paper describes the theoretical background of electromagnetic induction from metal objects modelling. The response function of a specific case of object shape - a homogenous sphere from ferromagnetic and nonferromagnetic material is introduced. Experimental data measured by a metal detector excited with a linearly frequency-swept signal are presented. As a testing target various spheres from different materials and sizes were used. These results should lead to better identification of the buried object.
Źródło:
Metrology and Measurement Systems; 2011, 18, 1; 57-67
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of poly-harmonic signals to eddy-current metal detectors and to advanced classification of metals
Autorzy:
Svatoš, J.
Pospíšil, T.
Vedral, J.
Powiązania:
https://bibliotekanauki.pl/articles/220481.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
eddy current
metal detector
polyharmonic signal
signal processing
classification
Opis:
A limited ability to discriminate between different materials is the fundamental problem with all conventional eddy-current-based metal detectors. This paper presents the use, evaluation and classification of nontraditional excitation signals for eddy-current metal detectors to improve their detection and discrimination ability. The presented multi-frequency excitation signals are as follows: a step sweep sine wave, a linear frequency sweep and sin(x)/x signals. All signals are evaluated in the frequency domain. Amplitude and phase spectra and polar graphs of the detector output signal are used for classification and discrimination of the tested objects. Four different classifiers are presented. The classification results obtained with the use of poly-harmonic signals are compared with those obtained with a classical single-tone method. Multi-frequency signals provide more detailed information, due to the response function - the frequency characteristic of a detected object, than standard single-tone methods. Based on the measurements and analysis, a metal object can be better distinguished than when using a single-tone method.
Źródło:
Metrology and Measurement Systems; 2018, 25, 2; 387-402
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DAC testing using modulated signals
Autorzy:
Fexa, P.
Verdal, J.
Svatoš, J.
Powiązania:
https://bibliotekanauki.pl/articles/220431.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital-to-analog converter
ENOB
Signal-to-noise and distortion - SINAD
FFT analysis
Crest Factor (CF)
Opis:
This document analyses qualities of methods used for testing dynamical parameters of Digital-to-Analog Converters (DAC) using a multi-frequency signal. As the source for these signals, Amplitude Modulated (AM) and Frequency Modulated (FM) signals are used. These signals are often used in radio engineering. Results of the tests, like Effective Number of Bits (ENOB), Signal-to-Noise and Distortion (SINAD), are evaluated in the frequency domain and they are compared with standard results of Sine Wave FFT test methods. The aim of this research is firstly to test whether it is possible to test a DAC using modulated signals, secondly to reduce testing time, while estimating band performance of DAC.
Źródło:
Metrology and Measurement Systems; 2011, 18, 2; 283-293
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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