Coriolis Flow Meter Sensor Damping Compensation
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Solution Overview
Problem
Coriolis measuring devices face operational challenges due to mechanical failures and adverse environmental conditions such as local magnetic fields, affecting their reliability in measuring mass flow and density, especially in media with liquid, gaseous, and solid components.
Innovation Solution
A method for operating a Coriolis measuring device using three vibration sensors arranged along the measuring tube centerline, with one sensor at the vibration node and the others on either side, to detect and correct for disturbances by determining and canceling out the influence of damping and phase delays in measurement signals, allowing for accurate mass flow measurement even in the presence of asymmetries or faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three vibration sensors are used to detect measuring tube vibrations, then reliability is improved, but measurement precision deteriorates due to vibration damping and phase delays affecting the sensors differently
Solution Approach 1:
The patent applies asymmetry by intentionally introducing a known asymmetric phase shift between sensor signals through the evaluation unit. This controlled asymmetry compensates for the unwanted asymmetric damping effects, allowing the system to maintain measurement precision while using multiple sensors for improved reliability
Solution Approach 2:
The evaluation unit analyzes the signals from all three sensors and dynamically adjusts the evaluation of mass flow and density by compensating for damping and phase delay effects. This feedback mechanism ensures that measurement precision is maintained despite the presence of multiple sensors experiencing different damping conditions
2Reliability
If vibration sensors are arranged at different locations along the measuring tube, then reliability is improved through redundancy, but device complexity increases
Solution Approach 1:
The evaluation unit is designed to perform multiple functions: it processes signals from any combination of the three sensors, automatically identifies functional sensors, compensates for damping effects, and calculates both mass flow and density. This multi-functionality handles the complexity of multiple sensors through a unified evaluation approach
3Reliability
If the third vibration sensor is arranged in the region of the vibration node, then reliability is improved, but measurement precision deteriorates because this sensor follows the vibration exciter movement directly without reflecting medium damping
Solution Approach 1:
The evaluation unit acts as an intermediary that processes the signal from the third sensor (at the vibration node) differently from the first two sensors. It uses this sensor's signal as a reference for exciter movement while applying specific compensation algorithms to extract accurate mass flow and density information, reconciling the different measurement characteristics
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 method enhances the reliability of Coriolis measuring devices by accurately determining mass flow and density measurements, even under disturbed conditions, by eliminating the effects of vibration damping and phase delays, and provides a means to identify and compensate for faults or external influences, ensuring precise and interference-resistant operation.
Implementation Method 1
the measuring tube is configured to form a Coriolis mode with a vibration node in the region of the plane of symmetry during mass flow
Implementation Method 2
measuring tube vibrations in the area of the first vibration sensor and in the area of the second vibration sensor are damped or delayed by the medium relative to the vibration exciter. This can be attributed, for example, to the viscosity of the medium
Data Source
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AI summary
The invention relates to a method (100) for operating a Coriolis measuring device (1), comprising the following method steps: determining an attenuation of the measuring tube vibrations in the region of the first vibration sensor and in the region of the second vibration sensor (101), measuring a first measurement variable by means of the measurement signals from the first vibration sensor and from the third vibration sensor (102), measuring a second mass flow rate by means of the measurement signals from the second vibration sensor and from the third vibration sensor (103), determining an influence of the attenuation on the first measurement variable and on the second measurement variable (104), forming differences between measured values of the first measurement variable and measured values of the second measurement variable (105), comparing the differences with the determined attenuation of the measuring tube vibrations (106).