초록 ▼

Time varying measurements indicative of the ratio of mass absorption coefficients of the components of a multiphase flow containing at least two liquid phases at two spaced apart locations are cross correlated to determine liquid flow velocity. The time varying measurements are provided by measuring

Time varying measurements indicative of the ratio of mass absorption coefficients of the components of a multiphase flow containing at least two liquid phases at two spaced apart locations are cross correlated to determine liquid flow velocity. The time varying measurements are provided by measuring the intensities of gamma-rays transmitted through a selected volume of the flow at two different gamma-ray energies. At least one of the gamma-ray energies has substantially different mass absorption coefficients in each of the two liquids. Gas velocity, when gas is present, and component fractions of all components are determined using a dual energy gamma-ray transmission technique and with the liquid flow velocity are used to derive mass flowrates.

대표청구항 ▼

A method for measuring liquid flow velocity of a multiphase flow containing at least two liquid phases, said method comprising: (i) passing said flow through a tube; (ii) measuring at a first location the intensities of gamma-rays transmitted through a first volume of said flow at two different gamm

A method for measuring liquid flow velocity of a multiphase flow containing at least two liquid phases, said method comprising: (i) passing said flow through a tube; (ii) measuring at a first location the intensities of gamma-rays transmitted through a first volume of said flow at two different gamma-ray energies, at least one of said gamma-ray energies having substantially different mass absorption coefficients in each of said two liquids, and obtaining a time varying measurement indicative of the ratio of the mass absorption co-efficients of the first volume at said two energies; (iii) measuring at a second location spaced from the first location in the direction of said flow the intensities of gamma-rays transmitted through a second volume of said flow at said two different gamma-ray energies and obtaining a time varying measurement indicative of the ratio of the mass absorption co-efficients of said second volume at said two energies; (iv) cross correlating the time varying measurements obtained at said first and second locations to derive a liquid flow transmit time; and (v) calculating said liquid flow velocity from the transit time and the spacing of said first and second locations.