Ultrasonic Flow Meter W-Path Signal Geometry
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Solution Overview
Problem
Ultrasonic flow meters face challenges in achieving accurate and linear flow measurements due to limitations in signal propagation and fluid path geometry, leading to suboptimal signal quality and measurement accuracy.
Innovation Solution
A flow meter design featuring a pair of ultrasonic transducers and three reflectors forming a W-shaped signal path, with a flow restriction member between the outermost reflectors, which narrows the fluid path and enhances linearity and signal quality by creating a more homogeneous active cross-section as a function of flow velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ultrasonic flow meter design is used with standard signal propagation paths, then the device complexity is low, but the measurement precision and signal quality are suboptimal
Solution Approach 1:
The patent employs a W-shaped ultrasonic signal path instead of a straight or simple angled path. This curved/complex geometry allows the ultrasonic waves to traverse through different regions of the fluid flow, sampling a more representative portion of the flow profile and thereby improving measurement accuracy while managing device complexity through a predetermined fixed path
Solution Approach 2:
The invention introduces a flow restriction member that creates a constricted flow channel section. This adds a dimensional constraint to the fluid path, forcing the flow to accelerate and become more uniform in the measurement region. The restriction member effectively adds a geometric dimension control that improves flow homogeneity and signal quality
2Measurement precision
If the flow channel is left unrestricted with standard geometry, then the ease of manufacture is high, but the measurement precision deteriorates due to non-homogeneous flow distribution
Solution Approach 1:
The flow restriction member is strategically positioned only in the specific region where ultrasonic measurement occurs, rather than constraining the entire flow channel. This local intervention creates a constricted measurement zone with homogeneous flow properties exactly where needed, while leaving the rest of the channel simple and easy to manufacture. The restriction affects only the local flow characteristics in the measurement path
Solution Approach 2:
The flow restriction member acts as an intermediary element between the fluid source and the ultrasonic measurement system. It modifies the flow characteristics to be more suitable for accurate ultrasonic measurement without requiring complex channel geometry throughout the entire system. The restriction member mediates between the simple channel structure and the precision measurement requirement
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 design improves measurement accuracy and signal quality by ensuring higher flow velocities maintain active cross-sections and inhibits fluid expansion near the flow restriction member, resulting in more precise flow rate determination.
Implementation Method 1
a first ultrasonic transducer disposed along the flow channel and configured to emit an ultrasonic signal into the flow channel; a second ultrasonic transducer disposed along the flow channel and configured to receive the ultrasonic signal emitted by the first ultrasonic transducer
Implementation Method 2
three reflectors arranged inside the flow channel, the three reflectors being configured to reflect the ultrasonic signal emitted by the first ultrasonic transducer multiple times on its way to the second ultrasonic transducer such that a W-shaped path of the ultrasonic signal is formed
Data Source
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AI summary
Ultrasonic flow meter. A Flow meter (1) comprising: a housing (3) and a flow channel (2) arranged inside the housing (3); two ultrasonic transducers (4, 5) disposed along the flow channel (2) and arranged at a distance, wherein the first ultrasonic transducer (4) is configured to emit an ultrasonic signal into the flow channel (2) and the second ultrasonic transducer (5) is configured to receive the ultrasonic signal emitted by the first ultrasonic transducer (4) into the flow channel (2); three reflectors (6a, 6b, 6c) arranged inside the flow channel (2), the three reflectors (6a, 6b, 6c) being configured to reflect the ultrasonic signal emitted by the first ultrasonic transducer (4) multiple times on its way to the second ultrasonic transducer (5) such that a W-shaped path (7) of the ultrasonic signal is formed; wherein the flow channel (2) is formed by a tubular member (9) inside the housing (3).