Ultrasonic Flow Velocity Compensation for Variable-Density Liquids
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Solution Overview
Problem
Existing ultrasonic flowmeters face inaccuracies in flow velocity measurements due to variations in fluid density, particularly with high salt concentrations, and current calibration methods are inadequate for dynamic changes in media densities.
Innovation Solution
A method and device assembly that measures a parameter correlated with fluid density, such as electrical conductivity, to predict and compensate for density changes, using a continuous compensation function to calculate a corrected flow velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic flowmeter is used to measure flow velocity, then flow rate can be determined, but measurement accuracy deteriorates when fluid density varies (e.g., high salt concentrations)
Solution Approach 1:
The system continuously measures conductivity to determine fluid density and uses this information to dynamically adjust the ultrasonic velocity compensation. This feedback loop ensures that the flow measurement remains accurate despite changes in fluid composition and density, directly resolving the contradiction between measurement precision and adaptability to varying densities
Solution Approach 2:
The system changes the operational parameters of the ultrasonic flowmeter based on measured fluid density. By adjusting the ultrasonic velocity parameter according to real-time density measurements from conductivity sensing, the system maintains measurement accuracy across different fluid compositions, resolving the contradiction between precision and adaptability
2Measurement precision
If manual calibration for various media is implemented, then measurement accuracy can be improved for specific media, but operation complexity increases and automatic adaptation is lost
Solution Approach 1:
The system performs automatic self-calibration by continuously measuring conductivity to determine fluid density and adjusting ultrasonic velocity parameters accordingly. This eliminates the need for manual calibration while maintaining measurement accuracy, directly resolving the contradiction between precision and ease of operation
Solution Approach 2:
The system automatically changes operational parameters based on real-time fluid properties. By dynamically adjusting ultrasonic velocity compensation based on measured density, the system replaces manual calibration with automatic parameter adaptation, resolving the contradiction between measurement precision and operational simplicity
3Measurement precision
If look-up table with compensation factors is used, then density compensation can be applied, but automation is limited and gradual adaptation is not possible
Solution Approach 1:
The system transitions from static look-up table compensation to dynamic real-time compensation. By continuously measuring conductivity and calculating density, the system dynamically adjusts ultrasonic velocity parameters, enabling gradual and automatic adaptation to changing fluid conditions, thus resolving the contradiction between compensation accuracy and extent of automation
Solution Approach 2:
The system implements continuous feedback-based density compensation. By measuring conductivity in real-time and adjusting ultrasonic velocity parameters accordingly, the system achieves both high compensation accuracy and full automation, resolving the contradiction between precision and extent of automation
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
Enables accurate and automated flow velocity determination in fluids with varying densities, particularly in biopharmaceutical processes, by dynamically adapting to changing media conditions.
Implementation Method 1
It measures the difference in transit times of these pulses downstream and upstream, which correlates to the fluid's flow velocity
Implementation Method 2
Each sensor sends an ultrasound wave to its opposite partner. The waves travel through the flowing liquid medium at a certain angle
Implementation Method 3
measuring at least one parameter of the medium that is correlated with the density of the medium... predicting the density based on the measured parameter
Data Source
Figure 1~2
AI summary
A method of determining a flow velocity of a liquid medium comprises the following steps: a) measuring at least one parameter of the medium that is correlated with the density of the medium; b) predicting the density based on the measured parameter; c) measuring a flow velocity of the medium using an ultrasonic flowmeter (10); and d) calculating a corrected flow velocity based on the measured flow velocity and the predicted density. A device assembly for determining a flow velocity of a liquid medium comprises an ultrasonic flowmeter (10) for measuring a flow velocity of the medium, and at least one sensor (24) for measuring a parameter of the medium that is correlated with the density of the medium. The device assembly further comprises a processing unit (26) for predicting the density based on the measured parameter, and for calculating a corrected flow velocity based on the measured flow velocity and the predicted density. The device assembly is configured to perform the method defined above.