UV Light Guide Hull Coating for Biofouling Prevention
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Solution Overview
Problem
Biofouling on ship hulls leads to increased drag and fuel consumption, with existing anti-fouling methods either toxic or inefficient in preventing microorganism attachment.
Innovation Solution
A method using UV light-emitting modules with a light guide and UV LEDs to distribute germicidal light across the hull surface, preventing microorganism attachment and growth by emitting light away from the surface, utilizing silicone and UV-grade silica materials for efficient light transmission and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biocides or toxic coatings are used to prevent biofouling, then anti-fouling effectiveness is improved, but environmental toxicity increases
Solution Approach 1:
The patent replaces chemical biocides with a physical/optical system consisting of UV light sources integrated into the hull coating. This substitution eliminates toxic substance release while maintaining anti-fouling effectiveness through continuous UV irradiation that prevents organism attachment and kills settled organisms.
Solution Approach 2:
The invention changes the operational parameters of the hull surface by integrating active UV light emission capabilities into the coating matrix. This transforms the static protective coating into a dynamic system that actively generates germicidal radiation, fundamentally altering how the surface interacts with biofouling organisms without relying on toxic chemicals.
2Reliability
If UV light sources are integrated into the hull coating, then anti-fouling effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges the UV light source, optical medium, and hull coating into a single integrated structure. The light sources are embedded within or near the optical coating that is bonded to the hull, creating a unified system where the coating serves both as structural protection and as the medium for light propagation and emission.
Solution Approach 2:
The optical coating performs multiple functions simultaneously: it serves as the protective hull coating, as the optical medium for light propagation, and as the emission surface for UV light delivery. This multi-functionality reduces the need for separate components and simplifies the overall system architecture.
3Reliability
If light is emitted in direction away from the hull surface, then germicidal effectiveness is improved, but light distribution efficiency decreases
Solution Approach 1:
The patent creates local emission zones within the optical coating where UV light is emitted in directions away from the hull surface. The optical medium is designed with specific properties that enable light to propagate through it and emit at controlled locations, creating localized germicidal zones that are most effective where needed while minimizing overall energy loss.
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 effectively reduces biofouling by killing microorganisms before they attach, reducing fuel consumption, maintenance costs, and environmental toxicity, while maintaining a smooth surface to minimize drag.
Implementation Method 1
UV LEDs for generating anti-fouling light
Implementation Method 2
It is well-known that most micro-organisms are killed, rendered inactive or unable to reproduce with 'sufficient' UV light
Implementation Method 3
Light from the light source is captured by slab of light guide by refraction at the end faces
Implementation Method 4
By total eternal reflection, light raise propagate in the slab
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A method of anti-fouling of a surface while said surface is at least partially submersed in an liquid environment, comprising: providing an anti-fouling light (9); distributing at least part of the light (9) through an optical medium (5) comprising a silicone material and/or UV grade fused silica; emitting the anti-fouling light (9) from the optical medium (5) and from the surface.