Comparison of noise reduction methods in radiometric correlation measurements of two-phase liquid-gas flows - Publikacja - MOST Wiedzy

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Comparison of noise reduction methods in radiometric correlation measurements of two-phase liquid-gas flows

Abstrakt

Two-phase liquid-gas flows occur frequently in the mining, energy, chemical, and petrochemical industries. One of non-contact methods used to analyse these flows is the gamma ray absorption method. However, the signals received from radiation detectors contain a significant stochastic noise, which makes them difficult to analyse. The article describes four methods of noise reduction in cross-correlation measurements of water-air mixture flows in a horizontal pipeline. In addition to the classical method of digital filtering of signals, the methods consisting in signal spectrum filtering, discrete wavelet transformation, and Nadaraya-Watson kernel estimator are described. Sample results of the measurements carried out in the horizontal pipe having the inner diameter of 30 mm for the air bubbles velocity ranging from 0.7 to 1.4 m/s are presented. In the research, the absorption set composed of two linear Am-241 gamma-ray sources and two scintillation NaI(Tl) probes was used. It was found that the lowest measurement uncertainty of the dispersed phase flow velocity is obtained when the cross-correlation distributions of the recorded signals are smoothed using the Discrete Wavelet Transform or the Nadaraya-Watson kernel estimator.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
MEASUREMENT nr 129, strony 288 - 295,
ISSN: 0263-2241
Język:
angielski
Rok wydania:
2018
Opis bibliograficzny:
Zych M., Hanus R., Wilk B., Petryka L., Świsulski D.: Comparison of noise reduction methods in radiometric correlation measurements of two-phase liquid-gas flows// MEASUREMENT. -Vol. 129, (2018), s.288-295
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.measurement.2018.07.035
Źródła finansowania:
  • Działalność statusowa
Weryfikacja:
Politechnika Gdańska

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