Imaging Fibre Apparatus with Dissimilar Core Stacks
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Solution Overview
Problem
Existing optical fibers used for high-resolution imaging face challenges due to core-to-core coupling, which degrades image quality, and the high costs associated with manufacturing fibers with high numerical aperture and specific core configurations.
Innovation Solution
The method involves arranging rods of different core sizes in a selected pattern to form stacks, which are then drawn and restacked to create a coherent imaging fiber. This approach reduces cross-talk between cores and allows for the use of lower-cost materials while maintaining imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cores are placed close together to build high resolution images, then image resolution is improved, but core-to-core coupling increases which degrades image quality
Solution Approach 1:
The patent applies local quality by making adjacent cores dissimilar through different materials or different sizes. This creates local variations in core properties that prevent coupling between neighboring cores while maintaining high spatial density for high-resolution imaging.
2Reliability
If numerical aperture is increased to reduce core-to-core coupling, then coupling is reduced, but manufacturing cost increases and background fluorescence occurs
Solution Approach 1:
Instead of uniformly increasing numerical aperture across all cores (which increases cost and fluorescence), the patent uses local quality by varying core sizes or materials only where needed to prevent coupling, maintaining cost-effectiveness while achieving the desired coupling reduction.
3Ease of manufacture
If random packing of cores is used to form imaging fibre, then manufacturing is simplified, but some nearest neighbour cores are the same which causes coupling
Solution Approach 1:
The patent applies preliminary action by pre-arranging cores in stacks with specific patterns before drawing. The stacking process ensures that adjacent cores are deliberately made dissimilar (different sizes or materials) before the fibre is formed, preventing coupling while maintaining manufacturing efficiency.
4Ease of manufacture
If germanium doped silica is used to form fibres, then fibre formation is achieved, but production is difficult and high stresses are involved
Solution Approach 1:
The patent reduces production complexity by using local quality variations (different core sizes or materials) rather than requiring complex germanium doping processes. This approach achieves coupling suppression through geometric or material variation at the core level without the high-stress manufacturing challenges of doped silica.
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 cross-talk between cores, improving signal transmission and imaging quality, while also lowering production costs by utilizing lower-cost materials and simplifying the manufacturing process.
Implementation Method 1
A coherent imaging fibre (which may be referred to as a fibre bundle) may comprise many thousands of light guiding cores, each of which transmits a part of an image along the fibre length
Data Source
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AI summary
A method of forming an imaging fibre apparatus comprises arranging rods to form a plurality of stacks each comprising a respective plurality of rods, wherein: for each stack, the respective plurality of rods comprises rods having different core sizes, the rods of different core sizes being arranged in a selected arrangement, and the rods of different core sizes being arranged such that each stack has a respective selected shape; wherein the selected shape or shapes are such that the stacks stack together in a desired arrangement;the method further comprising: drawing each of the plurality of stacks; stacking together the plurality of drawn stacks together in the desired arrangement to form a further stack;drawing the further stack; and using the drawn further stack to form an imaging fibre apparatus, wherein the selected arrangement of the rods in each stack and the selected shape or shapes of the stacks are such that the further stack comprises a repeating pattern of rods of different core sizes.