Submersible Sensor Vibration Control for Biofouling-Free Detection
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Solution Overview
Problem
Submerged environmental sensors are prone to biofouling, which affects measurement quality and requires frequent maintenance, with existing anti-fouling solutions being either polluting or requiring regular maintenance.
Innovation Solution
An environmental sensor that incorporates anti-fouling means by causing the measurement surface to vibrate using actuators, such as piezoelectric or ferroelectric actuators, to prevent or remove biofilm formation while maintaining measurement functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical anti-fouling coatings with biocides are applied to the sensor surface, then biofouling is prevented, but the system becomes polluting and the coatings become ineffective after biocide exhaustion
Solution Approach 1:
The patent replaces chemical anti-fouling systems with a mechanical vibration system. Piezoelectric actuators generate ultrasonic vibrations that physically disrupt and prevent biofilm formation through mechanical action rather than chemical biocides, eliminating pollution while maintaining anti-fouling effectiveness
Solution Approach 2:
The patent changes the operating parameters by applying specific vibration frequencies and amplitudes to the sensor surface. By controlling the mechanical vibration parameters, the system prevents biofouling through physical disruption of biofilm formation processes without requiring chemical substances
2Reliability
If mechanical anti-fouling systems like windscreen wipers are used to remove microorganisms, then the sensitive surface is cleaned, but the wiper itself becomes fouled and requires maintenance
Solution Approach 1:
The patent implements a self-service anti-fouling system where the sensor surface cleans itself through vibration-induced detachment of microorganisms. The piezoelectric actuators embedded in the sensor structure enable autonomous cleaning without external mechanical components like wipers, eliminating the maintenance burden while maintaining surface cleanliness
Solution Approach 2:
The patent extracts the cleaning function from external mechanical components and integrates it directly into the sensor structure itself. By embedding piezoelectric actuators within the sensor, the cleaning capability is built-in, removing the need for separate maintenance components and simplifying the overall system
3Measurement precision
If the measurement surface is made stationary to ensure stable measurements, then measurement stability is improved, but biofouling forms quickly on the static surface
Solution Approach 1:
The patent introduces dynamic vibration to the measurement surface through piezoelectric actuators. The surface alternates between stationary phases for stable measurement and vibrating phases for anti-fouling, creating a dynamic system that achieves both measurement precision and biofouling resistance by timing the vibration cycles appropriately
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 sensor effectively prevents biofouling and maintains consistent measurement quality by vibrating the measurement surface to detach microorganisms, reducing the need for chemical biocides and mechanical maintenance.
Implementation Method 1
first means for causing at least said measurement surface to vibrate... such as piezoelectric or ferroelectric actuators
Implementation Method 2
such as piezoelectric or ferroelectric actuators
Implementation Method 3
The emitter generates a Love wave by virtue of the piezoelectric effect. The wave travels through the gap towards the receiver... The propagation speed or amplitude varies depending on the species deposited onto the gap
Data Source
AI summary
A method for controlling a submersible environmental sensor, the sensor including a support having a face which includes a sensitive zone configured to receive at least one species of interest (SOI), anti-fouling means configured to cause at least the sensitive zone to vibrate, and detection means for detecting a presence of the SOI on the sensitive zone, the detection means and the anti-fouling means being carried by the support, wherein the anti-fouling means includes actuators configured to cause the medium to vibrate in a standing mode with a wavelength 3-20 times the size of the SOI to confine the SOI on the sensitive zone, includes activating the anti-fouling means in a de-fouling mode, stopping the anti-fouling means, activating the anti-fouling means to confine the SOI in the sensitive zone, and stopping the anti-fouling means. The method also includes activating the detection means and stopping the detection means.