公开(公告)号：US11169013B2

公开(公告)日：2021-11-09

申请号：US16616199

申请日：2017-06-14

Applicant: Micro Motion, Inc.

Inventor： Matthew Joseph Rensing ,  Timothy J. Cunningham

IPC: G01R23/20 ,  G01F1/84 ,  G01F25/00 ,  G01R23/00 ,  G01R27/32 ,  G01R23/16 ,  G01R27/28 ,  G01R29/06 ,  G01R29/26 ,  H04B3/46 ,  H04B17/20

Abstract: A system (800) for determining frequency spacings to prevent intermodulation distortion signal interference is provided. The system (800) includes a sensor assembly (810) and a meter verification module (820) communicatively coupled to the sensor assembly (810). The meter verification module (820) is configured to determine a frequency of a first signal to be applied to a sensor assembly (810) of a vibratory meter and set a demodulation window about the frequency of the first signal. The meter verification module (800) is also configured to determine a frequency of the second signal to be applied to the sensor assembly such that a frequency of an intermodulation distortion signal generated by the first signal and the second signal is outside the demodulation window.

公开(公告)号：US10890473B2

公开(公告)日：2021-01-12

申请号：US15745014

申请日：2015-07-27

Applicant: Micro Motion, Inc.

Inventor： Matthew Joseph Rensing

IPC: G01F1/84 ,  G01F25/00

Abstract: A method is provided comprising the steps of exciting a vibration mode of a flow tube (130, 130′), wherein first and second drivers (180L, 180R) are amplitude modulated out of phase from each other, and wherein a drive command provided to the first and second drivers (180L, 180R) comprises a sum of N+1 independent signals. The first and second drivers (180L, 180R) are excited with a plurality of off-resonance frequencies and the effective phase between a modal response and the drivers (180L, 180R) at each of the off-resonance frequencies is inferred. A left eigenvector phase estimate is generated for each of the off-resonance frequencies. A phase of a left eigenvector at a resonant drive frequency is estimated based on off-resonance frequency phase estimates. The method also comprises measuring the phase between a first pickoff (170L) and a second pickoff (170R) and determining a phase of a right eigenvector for the flow tube (130, 130′).

公开(公告)号：US10788348B2

公开(公告)日：2020-09-29

申请号：US15745040

申请日：2015-07-27

Applicant: Micro Motion, Inc.

Inventor： Matthew Joseph Rensing ,  Christopher George Larsen ,  Timothy J. Cunningham ,  Stuart J. Shelley

IPC: G01F1/84 ,  G01F25/00

Abstract: A method and apparatus for a flowmeter (5) is provided. The method comprises the steps of placing a material in a flow tube (130, 130′) while exciting a vibration mode of the flow tube (130, 130′). Exciting the vibration mode of the flow tube (130, 130′) comprises the steps of periodically driving a first driver (180L) with a first signal and periodically driving a second driver (180R) with a second signal, wherein the second driver (180R) is driven essentially in phase with the first driver (180L), but wherein the first driver's (180L) drive amplitude modulated signal reaches a maximum amplitude when the second driver's (180R) drive modulated signal reaches a minimal amplitude, and the first driver's (180L) drive amplitude modulated signal reaches a minimum amplitude when the second driver's (180R) drive amplitude modulated signal reaches a maximum amplitude. The method also comprises the steps of measuring the relative phase between a first pickoff (170L) and a second pickoff (170R) and determining a relative phase of a right eigenvector for the flow tube (130, 130′).