Isolated Acoustic Rail for Clamp-On Flow Meter Accuracy
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Solution Overview
Problem
Ultrasonic flow meters face accuracy issues due to ambient temperature, fluid temperature, calibration drift, and variations in conduit types and attachment quality, particularly in clamp-on transducers, which introduce ultrasonic signal attenuation and inconsistencies.
Innovation Solution
An ultrasonic flow meter with an isolated acoustic rail that receives and transmits acoustic signals independently of the conduit and fluid, using a programmable processor to generate flow measurement data from fluid, conduit wall, and acoustic rail signals, and includes a polymer or water-filled acoustic rail for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If clamp-on transducers are used to measure flow without disturbing piping, then ease of operation and adaptability are improved, but ultrasonic signal attenuation and measurement precision deteriorate due to additional interfaces
Solution Approach 1:
The patent introduces an acoustic rail as an intermediary component between the clamp-on transducers and the fluid. The acoustic rail provides a controlled acoustic transmission path that mediates the ultrasonic signal transmission, reducing the harmful effects of interface attenuation while maintaining the non-intrusive clamp-on installation method.
2Reliability
If a control signal is transmitted through the conduit wall to counter variable effects, then reliability is improved, but measurement precision deteriorates due to conduit wall variations and temperature effects
Solution Approach 1:
The patent segments the acoustic transmission path into distinct sections: the acoustic rail provides a separate, controlled path for the control signal that is isolated from the conduit wall and fluid. This segmentation allows the control signal to traverse a stable medium (the acoustic rail) rather than relying on the variable conduit wall structure.
Solution Approach 2:
The acoustic rail acts as an intermediary that provides a stable, controlled acoustic path for the control signal. By using the acoustic rail as a mediator between the transducers and the measurement process, the system eliminates the harmful effects of conduit wall variations and temperature-induced wall temperature changes on the control signal.
3Measurement precision
If acoustic signals are transmitted through the fluid to measure flow velocity, then measurement precision is improved, but reliability deteriorates due to signal attenuation from interface variations
Solution Approach 1:
The acoustic rail serves as an intermediary that provides a stable reference path for acoustic signals. By comparing the signal path through the fluid against the stable acoustic rail path, the system can compensate for interface variations and maintain both measurement precision and signal transmission reliability.
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 acoustic rail isolation enhances meter calibration and fluid property determination, providing consistent and accurate flow measurements by minimizing signal variations from conduit and fluid interactions.
Implementation Method 1
two or more transducers that send and receive ultrasonic signals forward (with the direction of the flowing fluid) and backward (against the direction of the flowing fluid)
Implementation Method 2
When fluid is flowing through the conduit, the backward signal will travel slower and take more time than the forward signal. When the fluid moves faster, the difference between the forward and backward signal times increases.
Implementation Method 3
an acoustic rail extending between the first and second transducers configured to receive the transmitted acoustic signals for transmission as acoustic rail signals in forward and reverse direction along an acoustic rail signal path along the acoustic rail
Data Source
AI summary
An ultrasonic flow meter configured to measure a flow within a conduit is described. The flow meter includes first and second transducers configured to transmit acoustic signals in forward and reverse direction as fluid flow signals along a fluid flow signal path through a fluid within the conduit, an acoustic rail extending between the first and second transducers configured to receive the transmitted acoustic signals for transmission as acoustic rail signals in forward and reverse direction along an acoustic rail signal path along the acoustic rail, a printed circuit board including circuitry for conducting ultrasonic transit time flow measurements and a programmable processor included on the printed circuit board that is configured to generate flow measurement data using the fluid flow signals and the acoustic rail signals. The acoustic rail being isolated from the conduit.