Micromotion Gmbh

Sheet Dynamics, Ltd.

Matthew Joseph Rensing

Timothy J Cunningham

Christopher George Larsen

Mark James Bell

David J Kapolnek

Andrew Timothy Patten

Stuart James Shelley

Thomas Dean Sharp

Roger Scott Loving

Amy Mai Nilsen

A vibratory flowmeter () for meter verification is provided, including meter electronics () coupled to the first and second pickoff sensors (L,R) and coupled to a driver (), with the meter electronics () configured to: vibrate the flowmeter assembly () in a single mode using the driver (), determine a single mode current () of the driver () and determine first and second response voltages () generated by the first and second pickoff sensors (L,R), respectively, compute frequency response functions for the determined first and second response voltages () from the determined single mode current (), fit the generated frequency response functions to a pole-residue model, and verify proper operation of the vibratory flowmeter () using the meter stiffness value (), residual flexibility (), and the meter mass () in embodiments.

Vibratory flowmeter and methods and diagnostics for meter verification

A vibratory meter () configured to predict and reduce noise in the vibratory meter (). The vibratory meter () includes a sensor assembly () and a meter electronics () in communication with the sensor assembly (). The meter electronics () is configured to provide a drive signal to a sensor assembly (), receive a sensor signal from the sensor assembly () having one or more components, and generate a signal to be applied to one of the sensor signal and the drive signal to compensate for the one or more components.

Predicting and reducing noise in a vibratory meter

A system (800) for minimizing a crest in a multi-tone drive signal in a vibratory meter (5) is provided. The system (800) includes a drive signal generator (810) configured to generate the multi-tone drive signal for the vibratory meter (5) and a drive signal detector (820). The drive signal detector (820) is configured to receive the multi-tone drive signal, determine a first maximum amplitude of the multi-tone drive signal having a component at a first phase, determine a second maximum amplitude of the multi-tone drive signal having the component at a second phase, and compare the first maximum amplitude and the second maximum amplitude.

Minimizing a crest in a multi-tone drive signal in a vibratory meter

A meter electronics () having a notch filter () configured to filter a sensor signal from a sensor assembly () in a vibratory meter () is provided. The meter electronics () includes the notch filter () communicatively coupled to the sensor assembly (). The meter electronics () is configured to receive the sensor signal from the sensor assembly (), the sensor signal being comprised of a first component at a resonant frequency of the sensor assembly () and a second component at a non-resonant frequency and pass the first component and substantially attenuate the second component with the notch filter, wherein the first component is passed with substantially zero phase shift.

Notch filter in a vibratory flow meter

A system () for determining frequency spacings to prevent intermodulation distortion signal interference is provided. The system () includes a sensor assembly () and a meter verification module () communicatively coupled to the sensor assembly (). The meter verification module () is configured to determine a frequency of a first signal to be applied to a sensor assembly () of a vibratory meter and set a demodulation window about the frequency of the first signal. The meter verification module () 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.

Frequency spacings to prevent intermodulation distortion signal interference

A vibratory flowmeter () for meter verification is provided, including meter electronics () configured to vibrate the flowmeter assembly () in a primary vibration mode using the first and second drivers (L,R), determine first and second primary mode currents () of the first and second drivers (L,R) for the primary vibration mode and determining first and second primary mode response voltages () generated by the first and second pickoff sensors (L,R) for the primary vibration mode, generate a meter stiffness value () using the first and second primary mode currents () and the first and second primary mode response voltages (), and verify proper operation of the vibratory flowmeter () using the meter stiffness value ().

Vibratory flowmeter and method for meter verification

A method is provided comprising the steps of exciting a vibration mode of a flow tube ('), wherein first and second drivers (L,R) are amplitude modulated out of phase from each other, and wherein a drive command provided to the first and second drivers (L,R) comprises a sum of N+1 independent signals. The first and second drivers (L,R) are excited with a plurality of off-resonance frequencies and the effective phase between a modal response and the drivers (L,R) 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 (L) and a second pickoff (R) and determining a phase of a right eigenvector for the flow tube (&#x2032;).

Off-resonance cycling for coriolis flowmeters

A method and apparatus for a flowmeter () is provided. The method comprises the steps of placing a material in a flow tube (') while exciting a vibration mode of the flow tube (&#x2032;). Exciting the vibration mode of the flow tube (&#x2032;) comprises the steps of periodically driving a first driver (L) with a first signal and periodically driving a second driver (R) with a second signal, wherein the second driver (R) is driven essentially in phase with the first driver (L), but wherein the first driver's (L) drive amplitude modulated signal reaches a maximum amplitude when the second driver's (R) drive modulated signal reaches a minimal amplitude, and the first driver's (L) drive amplitude modulated signal reaches a minimum amplitude when the second driver's (R) drive amplitude modulated signal reaches a maximum amplitude. The method also comprises the steps of measuring the relative phase between a first pickoff (L) and a second pickoff (R) and determining a relative phase of a right eigenvector for the flow tube (&#x2032;).

Method of determining the left eigenvectors in a flowing Coriolis flowmeter

A method for calibrating a flowmeter () transducer is provided comprising the steps of exciting a vibration mode of a flowmeter () flow tube (') and ceasing to excite the vibration mode, wherein a free decay response of the flow tube (&#x2032;) is measured. Amplitudes and phases of the free decay response at a drive frequency are extracted, and a strength of the transducer is calculated.

In situ transducer calibration

A meter verification method for a vibratory flowmeter () is provided, comprising vibrating a sensor assembly () of the vibratory flowmeter () with a plurality of test tones in a vibration mode using a driver (), wherein the plurality of test tones is applied substantially instantly, in the absence of a ramp function. A driver () current is determined, and response voltage of pickoff sensors (L,R) are determined for the vibration mode. The instantaneous frequency of the pickoff sensor (L,R) signals is measured, and a filter is applied to isolate the response at each of the plurality of test tones. The filter is also applied to the instantaneous frequency measurements. The same delay is applied to the frequency measurements and the response at each of the test tones. A meter stiffness value () is generated using the current () and the response voltage (), and proper operation of the vibratory flowmeter () is verified using the meter stiffness value ().

Vibratory flowmeter test tones without ramp time

A combined driver and pick-off sensor component () for a vibrating meter is provided. The combined driver and pick-off sensor component () includes a magnet portion (B) with at least a first magnet (). The combined driver and pick-off sensor component () further includes a coil portion (A,A) receiving at least a portion of the first magnet (). The coil portion (A,A) includes a coil bobbin (), a driver wire () wound around the coil bobbin (), and a pick-off wire () wound around the coil bobbin ().

Collocated sensor for a vibrating fluid meter

Meter electronics () for a flow meter () is provided according to an embodiment of the invention. The meter electronics () includes an interface () for receiving a vibrational response from the flow meter () and a processing system () in communication with the interface (). The vibrational response is a response to a vibration of the flow meter () at a substantially resonant frequency. The processing system () is configured to receive the vibrational response from the interface (), determine a frequency (&#x3c9;) of the vibrational response, determine a response voltage (V) and a drive current (I) of the vibrational response, measure a decay characteristic (&#x3b6;) of the flow meter (), and determine the stiffness parameter (K) from the frequency (&#x3c9;), the response voltage (V), the drive current (I), and the decay characteristic (&#x3b6;).

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Cincinnati, OH, United States of America

Matthew Joseph Rensing