METHOD FOR CALCULATING CURRENT PHASE DIFFERENCE AND FREQUENCY OF SIGNALS OF CORIOLIS FLOWMETERS Russian patent published in 2019 - IPC G01F1/84 

FIELD: monitoring and measuring equipment.

SUBSTANCE: invention relates to control and measurement equipment and methods of processing one or more sensor signals in a flow meter and can be used in instrument-making during development and manufacturing of Coriolis flowmeters. Method consists in using the signal representation from the Coriolis flowmeter position sensors in the form of a sum of complex exponentials with unknown parameters. This enables to obtain a set of readings after digitization of signals, each of which in turn will also be a sum of corresponding partial components with the same parameters which can be represented in form of , (2) n = 0…S> N, where lower digital index denotes sensor number, R_1(2),k, ω_1(2),k, α_1(2),k – complex amplitude, frequency and attenuation of the k-th harmonic of the corresponding sensor, number of exponential components in the analysed signal, N is the number of discrepancies in the evaluation window, ε_1(2),k(t) is the additive noise component of the corresponding signal. Used signal model enables to calculate parameters R_1(2),k, ω_1(2),k, α_1(2),k, and from them - to calculate required frequency and phase difference in accordance with expressions

. Further, these parameters are transmitted to the flow parameter estimation system, after which the next (n+1)-th sample unit arrives to the system, which is equivalent to shifting the evaluation window by one sampling cycle, and the cycle of calculations is repeated again.

EFFECT: high accuracy of measuring mass and volume flow rate of a liquid medium in the presence of a perturbing phase (gas or solid) in Coriolis flowmeters by reducing the number of samples and, accordingly, the time required to obtain the current flow rate.

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