High resolution processing techniques for ultrasound doppler velocimetry in the presence of colored noise. Part II: Multiplephase pipe-flow velocity measurement.
This paper presents an application of continuous wave ultrasound Doppler velocity measurements to two-phase flow in pipes. In many petroleum wells, the multiphase flow is separated into two phases: the first is a liquid phase and the second is a gas phase with small scatterers. The problem of multiphase velocity profile measurements has not been satisfactorily solved by classical approaches due to the multiphase nature of the fluid and the presence of colored noise, which introduces a significant bias in classical frequency estimators. We propose the use of high resolution frequency techniques to overcome the classical limitations. Direct estimation of Doppler frequency then obtained using either time frequency maximum frequency or arguments of poles of the parametric model that identifies the Doppler part of the signal is discussed. The tests made with synthetic Doppler signals and two-phase flow have demonstrated the excellent performance of the high resolution techniques based on reassignment and parametric techniques.
Kouamé
Denis
D
Lussi/Gip Ultrasons, Tours, Cedex 37032, France. kouame@univ-tours.fr
Girault
Jean-Marc
JM
Remenieras
Jean-Pierre
JP
Chemla
Jean-Paul
JP
Lethiecq
Marc
M
D000465:Algorithms; D001783:Blood Flow Velocity; D001808:Blood Vessels / Q000000981:diagnostic imaging / Q000502:physiology; D003198:Computer Simulation; D005583:Fourier Analysis; D005740:Gases; D007089:Image Enhancement / Q000379:methods*; D015233:Models, Statistical; D011786:Quality Control; D015203:Reproducibility of Results; D012212:Rheology / Q000295:instrumentation / Q000379:methods*; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D012996:Solutions; D013269:Stochastic Processes; D018608:Ultrasonography, Doppler / Q000379:methods*
D005740:Gases; D012996:Solutions