Independent Membrane Vibration for Aquatic Sensor Biofouling

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Solution Overview

Problem

Existing measurement devices in liquid environments suffer from biofouling by microorganisms, which disrupt measurements, and current anti-biofouling methods, such as biocidal coatings and mechanical devices, are either polluting, require maintenance, or modify the sensor structure, leading to reduced accuracy and robustness.

Innovation Solution

A biofouling control system comprising a membrane vibrated by an actuator with specific dimensions and frequency to expel microorganisms, compatible with existing measurement devices without modification, ensuring minimal vibration damping and effective detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a membrane is vibrated to expel microorganisms, then biofouling is prevented, but the sensor window may break or deform under vibration

Engineering Contradiction:

Improvebiofouling preventionVSAvoidsensor window integrity

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The system separates the vibration function from the sensor window by introducing an independent membrane component. The membrane is vibrated by a dedicated actuator, while the sensor window remains stationary and unaffected by vibration forces. This segmentation allows the membrane to perform the anti-biofouling function without compromising the sensor window's structural integrity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The membrane acts as an intermediary element between the actuator and the sensor window. It transmits the vibration action to expel microorganisms from the measurement surface while physically isolating the sensor window from direct vibration exposure. This intermediary approach protects the sensor window from mechanical stress while still achieving the desired anti-biofouling effect.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If chemical coatings are applied to prevent biofouling, then microorganisms are repelled, but the coating becomes ineffective after biocides are depleted and causes pollution

Engineering Contradiction:

Improvebiofouling preventionVSAvoidpollution and coating degradation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The system replaces chemical-based anti-biofouling mechanisms with a mechanical vibration approach. Instead of relying on biocidal chemicals that deplete over time and cause pollution, the membrane actuator generates mechanical vibrations that physically expel microorganisms from the measurement surface. This substitution eliminates the harmful chemical effects while maintaining effective biofouling prevention.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The vibration-based system provides continuous self-cleaning action without requiring replenishment of chemical agents. The membrane actuator continuously vibrates to prevent microorganism deposition and remove existing deposits, creating a self-sustaining anti-biofouling mechanism that does not degrade over time like chemical coatings.

Inventive Principle:

Principle #25Self-service

3Reliability

If mechanical devices like shutters or wipers are used to remove microorganisms, then deposition is prevented, but the devices require regular maintenance and are sensitive to biofouling

Engineering Contradiction:

Improvebiofouling preventionVSAvoidmaintenance requirements

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The system uses controlled mechanical vibrations generated by the actuator to prevent microorganism deposition and remove existing deposits from the measurement surface. This vibration-based approach is more reliable than mechanical shutters or wipers because it requires no moving parts that can clog or fail, and it provides continuous protection without requiring manual intervention or maintenance.

Inventive Principle:

Principle #18Mechanical vibration

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 system effectively prevents deposition and growth of microorganisms on measurement surfaces, maintaining measurement accuracy and device integrity while being adaptable to various technologies without structural changes.

Implementation Method 1

an actuator, positioned on one of the faces of the membrane and able to vibrate the membrane

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 2

the actuator being such that the minimum distance di from the inner contour to the centre C and the minimum distance de from the outer contour to the centre C satisfy the relationship de/di ≥ 1.2

Methodology Applied

Scientific EffectMechanical vibration: Ultrasonic Vibration

Data Source

PatentUS20250327703A1Vibratory system for protecting a sensor against biofouling by aquatic microorganisms

Publication Date: 2025.10.23 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

AI summary

A system for controlling biofouling by microorganisms, adapted to cooperate with a measurement device adapted to be immersed in a liquid, the measurement device including a fouling surface able to allow measurement, the system being configured to cover the fouling surface and including a membrane and an actuator to vibrate the membrane.