Viscosity-Corrected Sound Velocity Measurement in Fluids
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Solution Overview
Problem
Existing methods for determining the speed of sound in fluids fail to account for viscosity-related energy dissipation and damping, leading to measurement errors, especially in small measuring cells or short distances.
Innovation Solution
A method and device that correct the measurement error by using a correction table or adjustment table to account for viscosity, where the viscosity value is determined and used to calculate the corrected speed of sound from the transit time and measuring distance, and optionally considering temperature effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound pulses are transmitted through the fluid to determine speed of sound, then measurement can be performed, but viscosity causes energy dissipation and damping leading to measurement error
Solution Approach 1:
The patent converts the harmful viscosity-related energy dissipation and damping effects into a beneficial correction factor. By measuring the attenuation of sound pulses and using this information to calculate a correction factor, the method transforms the previously problematic viscosity effect into a useful correction that improves measurement accuracy, especially in small measuring cells.
Solution Approach 2:
The patent changes the measurement approach by introducing a correction factor that adjusts the measured speed of sound based on viscosity-related attenuation. This parameter change allows the system to compensate for energy dissipation effects, transforming the raw measurement into an accurate speed of sound value despite the presence of viscosity.
2Quantity of substance
If small measuring cells are used to reduce sample quantity, then measurement can be performed with minimal fluid, but viscosity-related measurement errors increase
Solution Approach 1:
The patent turns the harmful viscosity effects that are amplified in small measuring cells into a beneficial correction mechanism. By measuring the attenuation in the small cell and using this to calculate a correction factor, the method achieves accurate speed of sound measurements even with minimal fluid samples, effectively converting the limitation of small cell size into an opportunity for improved measurement precision.
Solution Approach 2:
The patent replaces direct mechanical measurement of sound propagation time with a corrected calculation that accounts for viscosity effects. Instead of relying solely on raw time measurements that are sensitive to viscosity-induced damping, the system uses attenuation-based correction factors to substitute for more accurate measurements, enabling precise results in small cells where direct measurement would be compromised.
3Device complexity
If viscosity is not taken into account, then measurement process is simple, but measurement error occurs especially in small measuring cells
Solution Approach 1:
The patent introduces a correction factor as an additional parameter that adjusts the speed of sound measurement based on viscosity-related attenuation. This parameter change adds a layer of complexity to the measurement process, allowing the system to compensate for viscosity effects and achieve accurate results, particularly in small measuring cells where viscosity impacts are magnified.
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 provides accurate determination of the speed of sound by correcting for viscosity-related errors, improving measurement precision in small measuring cells and high viscosity fluids, and accounting for temperature influences.
Implementation Method 1
sound pulses are generated and transmitted to the fluid to be examined, with the sound pulses being registered in the fluid to be examined after covering a specified measuring distance
Implementation Method 2
processes or fluid properties such as viscosity, which cause energy dissipation or damping when a sound pulse passes through a fluid
Data Source
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AI summary
The invention relates to a method for determining a corrected value for the viscosity-dependent speed of sound in a fluid (1) to be investigated, wherein sound pulses are generated and transmitted to the fluid (1) to be investigated, wherein the sound pulses are registered after traversing a predetermined measuring distance (4) in the fluid (1) to be investigated, wherein the initial onset (Tof1, Tof2) of the first sound pulse received after traversing the measuring distance (4) is determined and the transit time of the first received sound pulse in the fluid (1) to be investigated is determined, wherein a viscosity value (η) for the fluid (1) to be investigated is specified or determined and the transit time of the first received sound pulse and the viscosity value (η) are used to determine the speed of sound in the fluid (1) to be investigated.