Coriolis Measurement Device Asymmetric Sequence Stabilization
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Solution Overview
Problem
Coriolis measurement devices face issues with sensor asymmetry due to manufacturing inaccuracies, leading to noisy measurement variables, especially when dealing with media containing multiple components in different states of matter, causing unstable measured values.
Innovation Solution
A method is introduced to stabilize the measured values by creating an asymmetric sequence of values from sensor amplitudes, checking for invalidity criteria such as excessive scattering or resonance frequency deviations, and replacing invalid values with last valid or predetermined values to produce a stabilized sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor asymmetry is corrected after initial calibration, then measurement device can operate, but the measurement variable becomes very noisy and unstable
Solution Approach 1:
The patent applies preliminary action by performing calibration and asymmetry correction before actual measurement operations. The system pre-determines asymmetry characteristics during an initial calibration phase, storing these characteristics for later use. This allows the measurement device to compensate for sensor asymmetries before they affect measurement accuracy, thereby reducing noise and improving stability during operational measurements.
Solution Approach 2:
The patent implements feedback by continuously monitoring measurement variables and comparing them against calibrated reference values. When deviations due to asymmetry are detected, the system automatically applies correction factors derived from the initial calibration. This closed-loop feedback mechanism ensures that asymmetry-related noise is continuously compensated, maintaining measurement stability over time.
2Measurement precision
If asymmetric sequence of values is used for diagnosis, then sensor asymmetry can be detected, but the values become unstable when medium contains multiple components
Solution Approach 1:
The patent extracts the asymmetry diagnostic function from the main measurement process by creating a separate asymmetric sequence of values specifically for diagnosis purposes. This extracted sequence is independently evaluated against validity criteria, allowing asymmetry detection to proceed without being destabilized by complex medium conditions. The separation enables targeted analysis of asymmetry while filtering out noise from multi-component media.
Solution Approach 2:
The patent applies parameter changes by transforming raw sensor signals into an asymmetric sequence of values with specific mathematical properties. By changing the parameter representation from direct sensor readings to asymmetry-derived values, the system enhances sensitivity to asymmetry while simultaneously reducing sensitivity to medium composition variations. This parameter transformation stabilizes the diagnostic measurements.
3Stability of the object's composition
If invalid values are replaced with substitute values, then measurement stability improves, but device complexity increases
Solution Approach 1:
The patent employs disposable substitute values (such as predetermined default values or previously valid measurements) that are used temporarily to replace invalid measurements. These substitute values serve their purpose of maintaining measurement continuity and are then discarded once the next valid measurement is obtained. This approach provides stability without requiring complex long-term data management systems.
Solution Approach 2:
The patent implements a discard and recover strategy where invalid measurements are discarded and replaced with substitute values, while valid measurements are retained and used to update the measurement sequence. This selective discarding and recovering process maintains measurement stability by filtering out invalid data while preserving valid information, without requiring complex reconstruction algorithms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces noise in measurement variables, providing a more stable and reliable output by filtering out invalid data points and addressing asymmetry-related issues, especially in complex media conditions.
Implementation Method 1
the coil device and the magnetic device of each sensor are moved relative to one another by measuring tube vibrations, during which a measured electrical voltage is induced in the coil
Data Source
AI summary
A method for operating a Coriolis measurement device comprises: recording the measured voltages from the sensors and creating an asymmetric sequence of values using the amplitudes of the measured voltages for the purpose of diagnosing the Coriolis measurement device; checking whether the asymmetric sequence of values satisfies at least one invalidity criterion; and creating a stabilized asymmetric sequence of values on the basis of the asymmetric sequence of values by replacing asymmetric measured values with substitute values. While an invalidity criterion is satisfied a last valid measured value of the asymmetric sequence of values is used as the current value of the stabilized asymmetric sequence of values, or the stabilized asymmetric sequence of values is set to a predetermined value, a first invalidity criterion being based on a scattering parameter of the asymmetric value exceeding a first limit value.