Application of ANN and PCA to two-phase flow evaluation using radioisotopes

Abstract

Abstract. In the two-phase flow measurements a method involving the absorption of gamma radiation can be applied among others. Analysis of the signals from the scintillation probes can be used to determine the number of flow parameters and to recognize flow structure. Three types of flow regimes as plug, bubble, and transitional plug -bubble flows were considered in this work. The article shows how features of the signals in the time and frequency domain can be used to build the artificial neural network (ANN) to recognize the structure of the gas-liquid flow in a horizontal pipeline. In order to reduce the number of signal features the principal component analysis (PCA) was used. It was found that the reduction of signals features allows for building a network with better performance.

Identification of gas-liquid flow regimes using a non-intrusive Doppler ultrasonic sensor and virtual flow regime maps

“…In this paper, a non-intrusive and non-radioactive method for the objective identification of twophase gas/liquid flow regime is proposed using CWUD signals and machine learning (ML) approaches. Many ML solutions to objective flow regime identification have already been proposed, such as (Xie et al, 2004;Hanus et al, 2017;Wang and Zhang, 2009;Trafalis et al, 2005). In this work, to better facilitate the applicability to industrial practice, principal components analysis (PCA) is used particularly for visualising the information from intrinsic flow regime features in 2-dimensional space.…”

Radioisotope measurements of the liquid-gas flow in the horizontal pipeline using phase method

“…In the presented experiment two sets consisting of linear Am-241 sources with an activity of 100 mCi and probes with NaI(Tl) scintillation detectors were used. At the outputs of two scintillation probes, count signals I x (t) and I y (t) are registered for the first and second probe respectively [21]. The gamma-absorption equipment described above was applied in the experimental measurement set-up, performed in Industrial Radiometry Laboratory of the AGH University of Science and Technology in Krakow, Poland.…”

“…The gamma-absorption measuring set: 1 -gamma ray sources with collimators, 2 -scintillation probes, 3 -detectors' collimators, 4 -pipeline, 5 -the main beam of gamma rays, υ a -velocity of air, υ W -velocity of water [21]. …”

Prospects for the application of radiometric methods in the measurement of two-phase flows

“…In order to perform automatic pattern flow recognition one may utilize artificial neuron networks or other methods of the so-called calculation intelligence. The particular applications were described in publications [36][37][38][39].…”