Bent X-Ray Grating Top Bridges With Post-Bend Electroplating
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Solution Overview
Problem
The manufacturing of X-ray gratings for X-ray dark field and phase contrast imaging is challenging due to the need for precise structures with high mechanical stability, particularly in the source grating G0, which faces instability from thermal and radiation loads, and the top bridges experience high mechanical stress when bent.
Innovation Solution
A method involving electroplating top bridges after bending the resist negative grating, allowing for improved mechanical stability by reducing stress through a modified manufacturing process, including precise bending and electroplating in a compatible frame to minimize stress and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If top bridges are electroplated before bending the grating, then the grating structure is formed, but the top bridges experience high mechanical stress when bent
Solution Approach 1:
The grating is bent to the desired radius before electroplating the top bridges. This preliminary bending action ensures that when the bridges are subsequently electroplated onto the already-bent grating, they follow the curved geometry and experience minimal mechanical stress, resolving the contradiction between forming the grating structure and reducing stress on the bridges.
2Adaptability or versatility
If the resist negative grating is bent to access the full field of view, then the imaging capability is improved, but the top bridges become subject to high mechanical stress
Solution Approach 1:
The grating is bent to the desired radius before electroplating the top bridges. This preliminary bending action ensures that when the bridges are subsequently electroplated onto the already-bent grating, they follow the curved geometry and experience minimal mechanical stress, resolving the contradiction between forming the grating structure and reducing stress on the bridges.
3Strength
If electroplating is performed after bending, then the top bridges experience reduced mechanical stress, but the manufacturing process becomes more complex
Solution Approach 1:
The grating is bent to the desired radius before electroplating the top bridges. This preliminary bending action ensures that when the bridges are subsequently electroplated onto the already-bent grating, they follow the curved geometry and experience minimal mechanical stress, resolving the contradiction between forming the grating structure and reducing stress on the bridges.
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 method enhances the mechanical stability of X-ray gratings, reducing the risk of ductile regime entry and maintaining homogeneity under temperature and mechanical vibration, thereby improving the performance and reliability of X-ray imaging systems.
Implementation Method 1
filling the grating openings on the flat sample by electroplating, by continuing the electroplating up to the height of the grating webs for forming grating lamellae
Data Source
Figure 1a~1e
Figure 2A
Figure 2B~2E
AI summary
In order to improve the mechanical stability of an X-ray grating with top bridges for X-ray dark field imaging and/or X-ray phase contrast imaging, it is proposed to reduce or prevent the undesired high stress on the top bridges by a change in the manufacturing process. Specifically, it is proposed to electroplate the top bridges after the bending. In other words, the electroplating of the top bridges is performed on the bent geometry.