Ultrasonic Flowmeter Wave Path Selection for Easier Alignment
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Solution Overview
Problem
Existing ultrasonic flow measurement systems require precise alignment and positioning of transducers to ensure accurate wave propagation and measurement, which is challenging due to variations in pipe size, material, and temperature, making them difficult to implement effectively.
Innovation Solution
The method utilizes ultrasonic transducers separated by a given distance and inclined at a specific path angle, allowing waves to propagate through the fluid and pipe wall, enabling flow rate determination using wave packets that correspond to an integer or half-integer number of reflections or V-shaped path sections, without the need for precise transducer positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transducers are precisely aligned and positioned to ensure accurate wave propagation, then measurement precision is improved, but device complexity and ease of operation deteriorate due to challenging alignment requirements
Solution Approach 1:
The system automatically identifies and selects the optimal wave packet from multiple reflections without requiring manual alignment or positioning adjustments. The transducers remain in fixed positions while the signal processing autonomously determines which wave packets to use for measurement, eliminating the need for operator intervention in alignment procedures
Solution Approach 2:
The system changes the parameter being measured from transducer position to wave packet selection. Instead of adjusting physical positions to optimize measurements, the system maintains fixed transducer positions and varies the selection of wave packets (different reflection paths) to achieve accurate flow measurements
2Measurement precision
If transducers are precisely aligned for ideal wave incidence, then measurement precision is improved, but device complexity increases due to multiple positioning requirements
Solution Approach 1:
The signal processing system automatically identifies suitable wave packets from the multiple reflections that occur between fixed transducers, eliminating the need for complex alignment mechanisms or adjustable positioning systems
Solution Approach 2:
The system allows excessive reflections to occur naturally between the transducers and selectively uses only the appropriate wave packets for measurement. Rather than preventing extra reflections through precise alignment, the system embraces them and filters for useful signals
3Ease of operation
If wave packets with integer number of reflections less than given number are used, then ease of operation is improved by simplifying setup, but measurement precision may worsen due to non-ideal wave incidence
Solution Approach 1:
The system measures the actual transit time of selected wave packets and uses this feedback to calculate flow rate accurately. The automatic selection of wave packets with integer reflections provides sufficient signal quality for the feedback mechanism to function effectively
Solution Approach 2:
The system replaces mechanical alignment adjustments with signal processing techniques. Instead of mechanically positioning transducers for ideal wave incidence, the system uses digital signal processing to select and analyze appropriate wave packets from the received signals
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 simplifies the setup process, allowing for accurate flow rate measurement across various pipe diameters and temperatures, reducing the complexity of transducer alignment and enhancing measurement precision and reproducibility.
Implementation Method 1
One transducer generates an ultrasonic wave that enters through the pipe wall into the liquid, then travels through the liquid. The wave can then couple through the pipe wall and be detected by a second transducer
Implementation Method 2
The difference in the transit time for these two wave packets can be related to the rate of liquid flow down the pipe
Implementation Method 3
The wave can bounce within the liquid column several times before being detected by a second transducer
Data Source
AI summary
A method of determining flowrate of a fluid (7) in a pipe is disclosed. The flowrate is determined using a flowmeter having first and second ultrasonic transducers (10; FIG. 8A) separated along the pipe by a given distance (D; FIG. 1) and inclined so that waves in the fluid propagate at a given path angle (θ; FIG. 1). For a given inner pipe diameter (d; FIG. 1), there is a given integer number of reflections between the first and second ultrasonic transducers. The method comprises obtaining flow rate measurements using wave packets (18) corresponding to an integer number of reflections which is less than said given number.