Transparent Composites with Tunable Refractive Index Matrices
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Solution Overview
Problem
Fiber-reinforced polymeric composite structures experience changes in optical quality due to temperature variations, leading to mismatched refractive indices between the matrix and fibers, which affects their transparency and strength.
Innovation Solution
Incorporating light-reactive materials or chromophores within the matrix and fibers, which can be activated by a light source to adjust the refractive index of the matrix, thereby matching or closely approximating the fiber refractive index, even under changing environmental conditions such as temperature and mechanical strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass is used as monolithic panel to provide sufficient strength, then strength is improved, but weight increases
Solution Approach 1:
The patent applies composite materials by combining glass fibers with a polymeric matrix to create a fiber-reinforced composite transparency. This composite structure provides the strength of glass fibers while using the lighter polymeric matrix, achieving high strength-to-weight ratio compared to monolithic glass panels
2Weight of moving object
If polymeric material is used to reduce weight, then weight is reduced, but strength decreases
Solution Approach 1:
The patent uses fiber-reinforced composite material where glass fibers are embedded in a polymeric matrix. The glass fibers provide the necessary strength and stiffness, while the polymeric matrix binds the fibers together and distributes loads, achieving both weight reduction and high strength
3Strength
If fiber-reinforced polymeric material is used to enhance strength, then strength is improved, but optical quality deteriorates under temperature changes
Solution Approach 1:
The patent applies parameter changes by carefully selecting and adjusting the refractive indices of both the polymeric matrix and glass fibers. The materials are chosen so that their refractive indices remain closely matched across a wide temperature range, preventing optical degradation while maintaining the strength benefits of fiber reinforcement
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
This solution maintains the optical transparency of fiber-reinforced composite structures across a wider temperature and strain range, ensuring consistent optical performance and enhanced durability by adjusting the refractive index to match the fibers, thus compensating for thermally and mechanically induced changes.
Implementation Method 1
The light source may be capable of emitting light of an activation wavelength that induces a reaction in the light-reactive material causing a change in the matrix refractive index
Implementation Method 2
The fibers and/or the matrix may include a photosensitive chromophore. The light source may be configured to emit light of a wavelength onto or toward the side edge. The wavelength may induce a reaction in the chromophore causing a change in the matrix refractive index
Data Source
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AI summary
A system may include a composite structure and a light source. The composite structure may include a matrix having a matrix refractive index, a plurality of fibers embedded in the matrix, and a light-reactive material in the matrix. The light source may be capable of emitting light of an activation wavelength that induces a reaction in the light-reactive material causing a change in the matrix refractive index.