Flow Meter Conduit Structure for Ultrasonic Noise Attenuation
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Solution Overview
Problem
Ultrasonic flow meters suffer from insufficient signal-to-noise ratios due to acoustic energy being transmitted through the sidewall of the conduit instead of the fluid, which limits the accuracy of flow rate calculations.
Innovation Solution
The implementation of geometric structures on the sidewall of the conduit, such as protrusions and baffles, to alter the acoustic path and absorb or reflect acoustic energy, combined with a dampening material to further reduce noise, thereby improving the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic energy is transmitted through the sidewall of the conduit, then the flow meter can detect signals, but the signal-to-noise ratio becomes insufficient due to noise transmission
Solution Approach 1:
A dampening material is introduced as an intermediary layer between the sidewall and the external environment. This material specifically targets and absorbs acoustic noise frequencies while allowing the useful ultrasonic flow measurement signals to pass through, effectively filtering out harmful acoustic energy without blocking the measurement function
Solution Approach 2:
The dampening material converts the harmful acoustic noise energy into a beneficial filtering mechanism. By strategically placing the material to absorb specific frequency ranges, the harmful noise transmission is transformed into a selective filtering process that enhances signal quality while maintaining the necessary acoustic coupling for flow measurement
2Measurement precision
If geometric structures are added to the sidewall to mitigate acoustic energy transfer, then noise is reduced, but the device complexity increases
Solution Approach 1:
Instead of adding complex geometric structures, the solution changes the material parameter of the sidewall by applying a dampening material layer. This parameter change approach modifies the acoustic properties of the conduit wall to absorb noise frequencies, achieving the same noise reduction effect as geometric structures but with simpler implementation and manufacturing
Solution Approach 2:
The dampening material serves as a relatively simple, easily replaceable component compared to permanent geometric modifications of the conduit structure. This material can be applied and removed without affecting the fundamental conduit geometry, reducing long-term maintenance complexity and allowing for easy replacement if performance degrades over time
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 geometric structures and dampening material effectively mitigate acoustic noise, enhancing the accuracy of flow rate measurements by reducing noise transmission through the sidewall, particularly at low velocities and low flow rates.
Implementation Method 1
The geometric structures are configured to inhibit the coherent transfer of acoustic energy through the sidewall by a combination of at least one or more of reflection, resonance, or interference
Implementation Method 2
The geometric structures are configured to inhibit the coherent transfer of acoustic energy through the sidewall by a combination of at least one or more of reflection, resonance, or interference
Implementation Method 3
The geometric structures are configured to inhibit the coherent transfer of acoustic energy through the sidewall by a combination of at least one or more of reflection, resonance, or interference
Implementation Method 4
a dampening material positioned about an exterior surface of the sidewall of the conduit. The dampening material is configured to receive and absorb acoustic energy transferred through a structure of the sidewall
Data Source
AI summary
A flow meter includes a conduit, and ultrasonic transducers. In some embodiments, the conduit includes a sidewall, an inner volume through which a fluid flows defined by the sidewall, and recesses. In some embodiments, each of the ultrasonic transducers is positioned in a corresponding one of the recesses. In some embodiments, the sidewall defines geometric structures configured to mitigate a transfer of energy through the sidewall.