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    Wyświetlanie 1-5 z 5
    Tytuł:
    DSPIC - Based impedance measuring instrument
    Autorzy:
    Santos, J.
    Ramos, P. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220477.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impedance measurement
    dsPIC
    ADC
    sine-fitting
    Opis:
    An implemented impedance measuring instrument is described in this paper. The device uses a dsPIC (Digital Signal Peripheral Interface Controller) as a processing unit, and a DDS (Direct Digital Synthesizer) to stimulate the measurement circuit composed by the reference impedance and the unknown impedance. The voltages across the impedances are amplified by programmable gain instrumentation amplifiers and then digitized by analog to digital converters. The impedance is measured by applying a seven-parameter sine-fitting algorithm to estimate the sine signal parameters. The dsPIC communicates through RS-232 or USB with a computer, where the measurement results can be analyzed. The device also has an LCD to display the measurement results.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 2; 185-198
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On roughness measurement by angular speckle correlation
    Autorzy:
    Salazar, F.
    Belenguer, T.
    García, J.
    Ramos, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/220643.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    roughness
    speckle
    non-destructive testing
    Opis:
    In this work, the influence of both characteristics of the lens and misalignment of the incident beams on roughness measurement is presented. To investigate how the focal length and diameter affect the degree of correlation between the speckle patterns, a set of experiments with different lenses is performed. On the other hand, the roughness when the beams separated by an amount are non-coincident at the same point on the sample is measured. To conclude the study, the uncertainty of the method is calculated.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 373-380
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real Time PC Implementation of Power Quality Monitoring System Based on Multiharmonic Least-Squares Fitting
    Autorzy:
    Ardeleanu, A. S.
    Ramos, P. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220586.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    real time
    multiharmonic least-squares fitting
    Opis:
    In this paper, an algorithm that monitors the power system to detect and classify power quality events in real time is presented. The algorithm is able to detect events caused by waveform distortions and variations of the RMS values of the voltage. Detection of the RMS events is done by comparing the RMS values with certain thresholds, while detection of waveform distortions is made using an algorithm based on multiharmonic leasts-squares fitting.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 543-554
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the use of multi-harmonic least-squares fitting for THD estimation in power quality analysis
    Autorzy:
    Ramos, P. M.
    Janeiro, F. M.
    Radil, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/220641.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    harmonic analysis
    power quality
    signal reconstruction
    spectral analysis
    harmonic distortion
    Opis:
    The quality of the supplied power by electricity utilities is regulated and of concern to the end user. Power quality disturbances include interruptions, sags, swells, transients and harmonic distortion. The instruments used to measure these disturbances have to satisfy minimum requirements set by international standards. In this paper, an analysis of multi-harmonic least-squares fitting algorithms applied to total harmonic distortion (THD) estimation is presented. The results from the different least-squares algorithms are compared with the results from the discrete Fourier transform (DFT) algorithm. The algorithms are assessed in the different testing states required by the standards.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 2; 295-306
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of Goertzel-based frequency estimation for power quality monitoring in embedded measurement systems
    Autorzy:
    Rodrigues, Nuno M.
    Janeiro, Fernando M.
    Ramos, Pedro M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173880.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power quality
    frequency estimation
    non-integer Goertzel
    frequency interpolation
    embedded measurement systems
    Opis:
    International standards from IEC and IEEE regulate power grid parameters such as the RMS value, frequency, harmonic and interharmonic distortion, unbalance or the presence of transients, that are important to assure the quality of distributed power. Standard IEC 61000-4-30 suggests the zero crossing algorithm for the measurement of the power grid frequency, but also states that different algorithms can be used. This paper proposes a new algorithm, the Fractional Interpolated Discrete Fourier Transform, FracIpDFT, to estimate the power grid frequency, suitable for implementation in resource limited embedded measurement systems. It is based on the non-integer Goertzel algorithm followed by interpolation at non-integer multiples of the DFT frequency resolution. The proposed algorithm is validated and its performance compared with other algorithms through numerical simulations. Implementation details of the FracIpDFT in an ARM Cortex M4 processor are presented along with frequency measurement results performed with the proposed algorithm in the developed system.
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 3; 455--468
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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