Coriolis Flow Meter Damping Correction
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Solution Overview
Problem
Conventional in-line measuring devices for flow rates and densities, especially those using vibration-type sensors, face significant inaccuracies and reduced reproducibility due to inhomogeneities like gas bubbles and solid particles in two- or multi-phase media, leading to fluctuations in measurement accuracy and potential over/underdosage in filling processes.
Innovation Solution
An in-line measuring device with a vibration-type transducer that determines a damping value based on the spatial distribution and concentration of inhomogeneities within the measuring tube, using periodic excitation signals and vibration measurements to correct for asymmetric damping effects, thereby improving the accuracy of mass flow and density measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If vibration-type sensors are used for measuring mass flow and density in two-phase or multi-phase media, then measurement speed and responsiveness are improved, but measurement precision deteriorates due to inhomogeneities like gas bubbles and solid particles
Solution Approach 1:
The patent implements feedback by continuously monitoring the damping value of sensor vibrations and using this information to detect and compensate for the presence of inhomogeneities in the medium. The system measures the damping caused by gas bubbles and solid particles, then adjusts the measurement calculations to account for these effects, maintaining precision while preserving the fast response of vibration-type sensors
Solution Approach 2:
The patent changes the parameter being monitored from simple vibration amplitude to vibration damping characteristics. By analyzing how the medium affects the damping of sensor vibrations rather than just the vibration itself, the system can distinguish between normal medium properties and the presence of inhomogeneities, thereby maintaining measurement precision in two-phase or multi-phase flows
2Adaptability or versatility
If conventional vibration-type sensors measure two-phase or multi-phase media, then the ability to handle complex media is improved, but reliability deteriorates due to asymmetric damping effects from inhomogeneities
Solution Approach 1:
The system uses feedback by continuously measuring vibration damping and comparing it against expected values for homogeneous media. When asymmetric damping is detected indicating the presence of inhomogeneities, the system activates compensation algorithms to correct the measurements, ensuring reliable results across different media types
Solution Approach 2:
The patent converts the harmful effect of inhomogeneities causing measurement errors into a useful diagnostic signal. By measuring the asymmetric damping caused by gas bubbles and solid particles, the system detects their presence and uses this information to compensate for their effects, turning a reliability problem into a correction opportunity
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
The solution significantly minimizes the impact of inhomogeneities on measurement accuracy, ensuring precise and repeatable mass flow and density readings, even in two- or multi-phase media, thus enhancing the reliability of filling processes by correcting for asymmetric damping effects in real-time.
Implementation Method 1
Measuring instrument electronics, reaction forces in the flowing medium, for example Coriolis forces, acceleration forces, frictional forces or the like, induce and, derived from these, generate at least one measurement signal
Implementation Method 2
a vibration-type sensor with a measuring tube (10) for guiding a medium to be measured, in particular a two-phase or multi-phase medium, with an excitation arrangement for generating vibrations of the measuring tube (10)
Implementation Method 3
with a sensor arrangement for detecting vibrations of the measuring tube (10), which generates a vibration measurement signal representing the vibrations of the measuring tube (10)
Implementation Method 4
the measuring instrument electronics determine a damping value, which represents a change in the damping counteracting the vibrations of the measuring tube (10)
Data Source
Figure 1A~3B
Figure 2
Figure 4
AI summary
The invention relates to an in-line measuring device, in particular in the form of a Coriolis mass-flow/density measuring device and/or Coriolis mass-flow/viscosity measuring device, comprising a probe (10) of the vibrating type, with at least one measuring tube (110) which at least temporarily vibrates when in operation, for at least temporarily guiding a two or multi-phase free-flowing medium, for example after charging with gas bubbles or solid particles, with an energiser device (116) acting on the measuring tube (110), of generating vibrations in the at least one measuring tube (110) and a sensor arrangement (117, 118) for recording vibrations of the at least one measuring tube, providing at least one measured signal (s1, s2) representing the vibrations of the measuring tube. The in-line measuring device further comprises a measuring device electronic circuit (20), electrically coupled to the probe, providing at least one energiser signal (iexc) driving the energiser arrangement and which at least temporarily determines a first type of damping value (XDI), representing a change in the damping opposing the vibrations of the measuring tube within a given time period ?T M .