Adjustable Positioning Aid for Antiresonant Hollow-Core Fiber Preforms
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Solution Overview
Problem
Existing methods for producing antiresonant hollow-core fibers face challenges in achieving precise positioning of antiresonance elements (AREs) due to geometric deviations, leading to unwanted gaps and asymmetrical deformations during thermal stretching, which can result in partial or complete loss of the preform.
Innovation Solution
A positioning aid equipped with adjustable adjustment means allows for fine-tuning of ARE preforms after initial positioning, enabling precise alignment and contact establishment between the ARE preforms and the sheath tube, thereby minimizing gaps and ensuring symmetrical surface tension during thermal stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If initial positioning of ARE preforms is performed using a fixed positioning aid, then positioning speed is improved, but positioning precision deteriorates due to geometric deviations and unwanted gaps
Solution Approach 1:
The positioning aid is designed with adjustable components that allow dynamic modification of the positioning geometry. The adjustment means enable the positioning aid to adapt to geometric deviations of ARE preforms, transforming a static positioning system into a dynamic one that can compensate for manufacturing tolerances and achieve precise positioning without requiring time-consuming manual adjustments
Solution Approach 2:
The positioning aid incorporates adjustment mechanisms that modify physical parameters such as position, orientation, and spacing of positioning elements. By changing these parameters, the system can accommodate variations in ARE preform dimensions and achieve optimal contact and positioning, thereby resolving the contradiction between speed and precision
2Device complexity
If ARE preforms are positioned without adjustment means, then device complexity is reduced, but reliability deteriorates due to asymmetrical deformations during thermal stretching
Solution Approach 1:
The adjustment means are designed to enable preliminary positioning and contact establishment between ARE preforms and the sheath tube before the thermal stretching process. This preliminary action ensures proper alignment and contact, preventing asymmetrical deformations during subsequent processing and improving preform reliability without requiring complex active control systems during manufacturing
3Ease of manufacture
If fixed positioning structures are used, then ease of manufacture is improved, but manufacturing precision deteriorates due to inability to compensate for geometric deviations
Solution Approach 1:
The positioning aid is divided into modular components with adjustment means that can be independently modified. This segmentation allows the positioning structure to be manufactured using standard processes while maintaining the capability for precise adjustment, thereby resolving the contradiction between ease of manufacture and positioning accuracy
Data Source
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AI summary
A known method for producing a preform for an antiresonant hollow core fiber comprises providing a sheath tube having an inner bore with an inner surface and a central axis, providing a plurality of tubular antiresonant element preforms (ARE preforms for short), each having a longitudinal axis and an outer surface, initially positioning the ARE preforms at peripheral target positions on the inner surface of the sheath tube by means of a positioning aid to form a primary preform, and thermally stretching the primary preform to form the hollow core fiber or further processing the primary preform to form a secondary preform from which the hollow core fiber is drawn.In order to enable the most precise possible positioning of the ARE preforms at predetermined azimuthal positions of the casing, it is proposed that a positioning aid be used which is equipped with adjustment means that allow a subsequent positioning of at least some of the ARE preforms compared to the initial positioning.