초록 ▼

An apparatus and method for measuring the flow velocities of individual phase flow components of a multiphase flow utilizes matched filters. Signals arising from flow noise disturbance are extracted from the flow, at upstream and downstream locations. The signals are processed through pairs of match

An apparatus and method for measuring the flow velocities of individual phase flow components of a multiphase flow utilizes matched filters. Signals arising from flow noise disturbance are extracted from the flow, at upstream and downstream locations. The signals are processed through pairs of matched filters which are matched to the flow disturbance frequency characteristics of the phase flow component to be measured. The processed signals are then cross-correlated to determine the transit delay time of the phase flow component between sensing positions.

대표청구항 ▼

A flowmeter for measuring in a multiphase flow, the flow rates of individual phase flow components having their own respective flow disturbance frequency characteristic comprising: detecting means for deriving from each of a pair of positions spaced apart in the direction of multiphase flow, an inpu

A flowmeter for measuring in a multiphase flow, the flow rates of individual phase flow components having their own respective flow disturbance frequency characteristic comprising: detecting means for deriving from each of a pair of positions spaced apart in the direction of multiphase flow, an input signal corresponding to flow disturbances in the multiphase flow; for each respective phase flow component, a pair of matched filters for filtering said input signals, with each of said pair of matched filters matched to the flow disturbance frequency characteristic of an individual phase flow component to be measured, each of said pair of matched filters generating an output signal corresponding only to the flow of said individual phase flow component being measured; and means for comparing the output signals of each of said pair of matched filters to determine the respective delay time between said pair of positions of the corresponding individual phase flow component being measured and to derive thereby the respective flow velocity of said individual phase flow component being measured. A method of measuring in a multiphase flow, the flow rates of phase flow components having their own respective flow disturbance frequency characteristics, comprising the steps of: a. for each phase flow component, obtaining first and second digital electrical signals corresponding to disturbances in the flow of said phase flow component, by sensing the passage of flow disturbances in the flow of said phase flow component respectively past a pair of positions spaced apart in the direction of multiphase flow; b. calculating for each phase flow component with the aid of a digital computer, using respective ones of said first and said second digital electrical signals as a database, pairs of matched filter transfer functions matched to the flow disturbance frequency characteristics of each of said phase flow components, respectively; c. obtaining third and fourth digital electrical signals corresponding to disturbances in the multiphase flow by sensing the passage of flow disturbances in the multiphase flow respectively past said pair of positions; d. filtering with the aid of the digital computer each of said third and said fourth signals to obtain pairs of matched filter output signals corresponding to respective ones of said phase flow components, by multiplying said third and said fourth signals with pairs of matched filter transfer functions which are matched to the flow disturbance frequency characteristics of respective ones of said phase flow components; and e. comparing each of said pairs of matched filter output signals to determine the delay between said pair of positions of each phase flow component being measured, respectively.