Fluid Density Measurement Using Tilt-Corrected Vibration
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Solution Overview
Problem
Existing methods for measuring fluid density using sectionally curved measuring tubes, such as those in U- or V-shape, often suffer from measurement errors due to the installed position of the tube, which can lead to inaccuracies in density determination.
Innovation Solution
The method involves ascertaining a tilt measured value representing the inclination of the measuring tube relative to the local gravity, and using both this tilt value and the oscillation frequency of the tube to calculate the density of the fluid, thereby correcting for position-dependent errors and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the measuring tube is installed in different positions, then the adaptability of the measuring system is improved, but measurement precision deteriorates due to position-dependent errors
Solution Approach 1:
The patent applies parameter changes by measuring the inclination angle of the measuring tube and using this parameter to correct the density measurement. The system determines the actual inclination angle relative to the gravity vector and applies a correction based on this angle, thereby compensating for position-dependent errors and maintaining measurement precision across different installation positions.
2Device complexity
If the inclination of the measuring tube is not compensated, then device complexity is reduced, but measurement precision deteriorates due to uncorrected position errors
Solution Approach 1:
The patent implements feedback by measuring the inclination angle of the measuring tube and using this information to correct the density measurement. The system continuously monitors the tube's orientation relative to gravity and applies real-time corrections to compensate for position-dependent errors, thereby maintaining high measurement precision without requiring complex mechanical alignment systems.
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 measurement errors associated with the tube's position, achieving an accuracy of over 99.9% in density measurement by accounting for the deformation caused by gravity, ensuring precise fluid density determination.
Implementation Method 1
the at least one measuring tube executes, at least partially, wanted oscillations, for example, bending oscillations, with a wanted oscillation frequency dependent on the density of the fluid
Implementation Method 2
measuring errors at times occurring, especially measuring errors dependent on the installed position of the measuring tube... ascertaining a tilt measured value, namely a measured value for an inclination of the at least one measuring tube in static resting position relative to a local acceleration of gravity
Data Source
AI summary
A method is provided for measuring density of a fluid by means of at least one at least sectionally curved measuring tube. The measuring tube is adapted to be flowed through by the fluid and concurrently to be caused to vibrate over a wanted oscillatory length, namely a tube length measured from a first tube end to a second tube end, a length which is greater than a minimum separation of the second tube end from the first tube end. According to the invention, among other things, also a tilt measured value representing an inclination of the at least one measuring tube in the static resting position relative to a local acceleration of gravity is ascertained, in such a manner that such represents an angle of intersection between a direction vector of an imaginary first reference axis (y-axis) and a direction vector of an imaginary second reference axis (g-axis). The first reference axis is so selected that it is perpendicular to an imaginary third reference axis (z-axis) imaginarily connecting the first tube end and the second tube end and points in the direction of a peak of the at least one measuring tube farthest from the third reference axis in the static resting position, while the second reference axis is so selected that it extends through a shared intersection of the first and third reference axes and points in the vertical direction, namely in the direction of the local acceleration of gravity. The tilt measured value is used together with a parameter measured value representing an oscillation frequency of the at least one measuring tube for ascertaining at least one density measured value representing the density of the fluid.