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

Zych, Marcin; Hanus, Robert; Wilk, Barbara; Petryka, Leszek; Świsulski, Dariusz

doi:10.1016/j.measurement.2018.07.035

Cited by 40 publications

(23 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The gas phase velocity is determined based on a cross-correlation analysis of signals obtained from two scintillation probes. More information on crosscorrelation analysis in radiometric measurements of twophase flows can be found in [10,11].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…In such cases, there are many sources of an unfavourable signal-tonoise ratio, among others: the statistical nature of radioactive decay, the chaotic way of forming and the flow of gas bubble clusters. The problem of noise reduction in this type of measurements is discussed in detail in [11].…”

Section: Experimental Datamentioning

confidence: 99%

“…4 shows the value of the CSDF module for the signal obtained from analyzed measurements. Due to the significant amount of noise, in order to properly analyse the recorded signal, frequency averaging method was applied (CSDF) [11].…”

Section: Signal Analysismentioning

confidence: 99%

“…5. Then a spectral filtering method was applied to obtain a signal without the noise in the time domain [11]. In the |CSDF| S plot, the orange frame (dotted line) marked a useful signal registered in range between the frequencies for 0.51 Hz up to 29.04 Hz.…”

Section: Signal Analysismentioning

confidence: 99%

See 3 more Smart Citations

Analysis and interpretation of radiometric signals in a liquid-gas bubble flow

et al. 2019

Self Cite

View full text Add to dashboard Cite

The article presents the analysis of signals from a radiometric system consisting of two scintillation probes and two gamma radiation sealed sources. Calculations and interpretation were carried out for the bubble flow of the water-air mixture in the horizontal pipeline. The analysis of the obtained signals was done in time and frequency domain. In the frequency domain, a range of usable frequencies was identified, which were associated with changes in gamma-ray intensity recorded in the time domain. The gas phase velocity, void fraction and statistical parameters of the signal were also calculated.

show abstract

Section: Experimental Set-upmentioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

Section: Signal Analysismentioning

confidence: 99%

Section: Signal Analysismentioning

confidence: 99%

See 2 more Smart Citations

Analysis and interpretation of radiometric signals in a liquid-gas bubble flow

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Estimation of time delays in dynamical systems with noise is a common engineering problem which appears in different areas like control performance monitoring of industrial processes, range estimation in radar, and other applications [1], [7], [ 8]. Nowadays, to estimate time delays between two signals, the correlation-based methods or the cross spectral density methods are widely used in practice [2]- [4].…”

Section: Introductionmentioning

confidence: 99%

A Cumulative-signals-based Method for Time Delay Estimation

Mosorov

2019

Measurement Science Review

View full text Add to dashboard Cite

An original method for time delay estimation is presented. It is based on changing input signals into cumulative ones, followed by determination of inflection points of cumulative curves, and estimation of time delay as time difference of these points’ occurrences. To determine the inflection points, a suitable algorithm is proposed. The preliminary results show that the proposed method is sufficiently efficient, especially in the case of flow measurements based on tomography technique when the cross-correlation function of the signals has no evident peak. This method has no limitations on its application for different types of input signals.

show abstract