Vibronic Sensor Phase Shift Decoupling Density Viscosity
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Solution Overview
Problem
Existing vibronic sensors face limitations in accurately determining the density and viscosity of media due to the need to account for mutual influences between these variables and are restricted by empirically derived relationships, leading to inaccuracies and limited applicability.
Innovation Solution
A vibronic sensor system that sets specific phase shifts between excitation and reception signals to determine density and viscosity using analytical formulas, accounting for interactions between the oscillatable unit and the medium, allowing for universal application across various viscous media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If empirical relationships are used to determine density and viscosity, then the measurement can be performed, but the accuracy is limited due to mutual influences between variables
Solution Approach 1:
The patent segments the determination of medium properties into two independent measurements: density is determined from frequency changes at a first phase shift, while viscosity is determined from frequency changes at a second phase shift. This segmentation eliminates the need to account for mutual influences between variables, as each property is measured independently through separate phase shift conditions.
Solution Approach 2:
The patent changes the phase shift parameter between excitation and reception signals to enable different measurement modes. By setting the phase shift to a first value (e.g., 0° or 180°) for density measurement and a second value (e.g., 90°) for viscosity measurement, the system can independently determine each property without interference from the other, thereby improving accuracy while maintaining simplicity.
2Adaptability or versatility
If a single phase shift method is used, then the device operation is simple, but the applicability is limited to specific media conditions
Solution Approach 1:
The patent implements a universal measurement system that can determine both density and viscosity of various viscous media using a single vibronic sensor device. By incorporating multiple phase shift measurement capabilities, the system becomes multi-functional and adaptable to different media conditions, while the electronic control unit automatically manages the complexity of switching between measurement modes, maintaining ease of operation.
Solution Approach 2:
The patent introduces dynamic switching of phase shift values between excitation and reception signals based on measurement requirements. The electronic control unit dynamically adjusts the phase shift parameter to enable different measurement modes (density vs. viscosity), allowing the system to adapt to various media conditions while the automated control maintains operational simplicity for the user.
3Measurement precision
If density and viscosity are determined simultaneously using empirical formulas, then both variables can be measured, but inaccuracies occur due to mutual influences
Solution Approach 1:
The patent segments the simultaneous measurement into sequential independent measurements by utilizing different phase shift conditions. Density is measured when the phase shift is at a first value, and viscosity is measured when the phase shift is at a second value. This temporal and conditional segmentation eliminates mutual variable influences, achieving high accuracy while the electronic control unit manages the switching complexity automatically.
Solution Approach 2:
The patent uses phase shift as an intermediary parameter to decouple the measurement of density and viscosity. By introducing the phase shift condition as a mediator between the excitation signal and the measurement process, the system can selectively measure each property independently, eliminating the need to mathematically resolve complex interdependencies between density and viscosity variables.
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 enhances the accuracy of density and viscosity determination by independently measuring each variable and expands the sensor's applicability to all viscous media, improving precision beyond prior art methods.
Implementation Method 1
which in turn can be, for example, a piezoelectric or electromagnetic drive
Implementation Method 2
which in turn can be, for example, a piezoelectric or electromagnetic drive
Implementation Method 3
this unit is excited into mechanical vibrations by a drive/receiver unit
Implementation Method 4
the resonant circuit condition must be met, according to which the gain factor is ≥1 and all phases occurring in the resonant circuit are multiples of 360°
Implementation Method 5
the drive/receiver unit can receive the mechanical vibrations of the mechanically vibrating unit and convert them into an electrical reception signal
Implementation Method 6
the drive/receiver unit can receive the mechanical vibrations of the mechanically vibrating unit and convert them into an electrical reception signal
Data Source
Figure 1
Figure 2~3c
AI summary
The invention relates to a vibronic sensor (1) and to a method for operating a vibronic sensor for monitoring at least the density (ρ) and/or the viscosity (η) of a medium (2) in a container (3), said vibronic sensor at least comprising a unit (4) that can vibrate mechanically, a driving/receiving unit (5), and an electronic unit (6), wherein the driving/receiving unit (5) is designed to excite the unit (4) that can vibrate mechanically to mechanically vibrate by means of an electrical excitation signal (UA), and to receive the mechanical vibrations of the unit (4) that can vibrate mechanically, and to convert said mechanical vibrations into an electrical reception signal (UE), wherein the electronic unit (6) is designed to produce the excitation signal (UA) on the basis of the reception signal (UE) in such a way that a specifiable phase shift (φ 45, φ 90) exists between the excitation signal (UA) and the reception signal (UE), wherein the electronic unit (6) is designed to set at least a first specifiable phase shift (φ 90) and a second specifiable phase shift (φ 45), and to determine a first frequency (ω90) and a second frequency (ω135) corresponding to the respective specifiable phase shifts (φ 90, φ 45), and to determine from the two frequencies (ω90, ω135) the density (ρ) by means of a first analytical formula and the viscosity (η) of the medium (2) by means of a second analytical formula.