Hydrophone Flow Shield Reducing Pseudo Noise
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Solution Overview
Problem
Current flow shields for hydrophones are not readily available off-the-shelf and lack reliability, making it difficult to achieve repeatable and effective reduction of pseudo noise, which masks real noise detection in underwater sound measurements.
Innovation Solution
A flow shield kit with a polyurethane shield and an intermediate fluid, such as oil or water, that surrounds the pressure transducer of the hydrophone, featuring an annular recess and longitudinally extending slots for secure mounting, providing improved acoustic detection by reducing pseudo-noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flow shields are made ad hoc by researchers, then flow noise reduction can be achieved, but reliability and repeatability of results deteriorate
Solution Approach 1:
The flow shield is divided into modular components including a shield body, mounting clamp, and sealing elements. This segmentation allows for standardized manufacturing of each component while maintaining overall system reliability and repeatability across different deployments.
Solution Approach 2:
The shield incorporates adjustable parameters such as opening configurations and mounting positions that can be optimized for different hydrophone types and flow conditions, enabling reliable performance across varying applications while maintaining repeatability through standardized adjustment procedures.
2Adaptability or versatility
If flow shields are customized for different hydrophones, then adaptability improves, but device complexity increases
Solution Approach 1:
The flow shield employs a universal mounting interface and standardized clamp mechanism that can accommodate multiple hydrophone models and configurations. This universal design reduces device complexity while maintaining adaptability across different hydrophone types through a single standardized platform.
3Object-affected harmful factors
If drifting hydrophones are used to reduce flow noise, then pseudo noise reduction improves, but labor intensity and deployment duration limitations worsen
Solution Approach 1:
The flow shield acts as an intermediary structure between the hydrophone and the surrounding water flow. It creates a controlled acoustic environment that reduces pseudo noise without requiring the hydrophone to drift, thereby eliminating the labor intensity and deployment duration limitations while maintaining noise reduction effectiveness.
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 solution enables reliable and repeatable reduction of pseudo noise, enhancing the detection of real noise in underwater sound measurements, and is suitable for both stationary and drifting hydrophones, improving operational efficiency and data accuracy.
Implementation Method 1
an intermediate fluid (e.g. oil or water) that occupies the intermediate space
Implementation Method 2
a shield (e.g. of incompressible polyurethane) having a density approximating that of a surrounding fluid in which the assembly will be immersed
Implementation Method 3
Flow noise (or pseudo noise) is caused by turbulent flow past a hydrophone
Data Source
AI summary
A hydrophone flow shield and hydrophone assembly including a hollow polyurethane flow shield with one or more features for improving reliable operation and assembly wherein the features include a recess for holding a clamp for securing the shield to the hydrophone, a slot or through hole extending longitudinally in the clamping region but not extending toward a closed end of the shield beyond the clamping region and when sizing of the shield and hydrophone are not closely matched providing for indirect sealing via a gasket that is located between the shield and the hydrophone.