X-ray Talbot Grating Holder with Curved Elastic Support
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Solution Overview
Problem
Existing X-ray Talbot capturing apparatuses face challenges in accurately bending gratings without causing damage and preventing vignetting, while maintaining a high signal-to-noise ratio for differential phase images.
Innovation Solution
An X-ray Talbot capturing apparatus with a holder system that includes a receiving unit and a pressing unit with curved surfaces, using an elastic member to bend the gratings in an arc shape with the radiation source as the center, ensuring the gratings are not damaged and radiation is not blocked, thus preventing vignetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the grating is bent to prevent vignetting, then the radiation passing rate is improved, but the grating may be damaged
Solution Approach 1:
The grating is bent into an arc shape with the radiation source as the center of curvature. This curved configuration ensures that radiation enters the grating in the normal direction at all points, eliminating vignetting while the arc geometry distributes stress uniformly to prevent grating damage
Solution Approach 2:
An elastic member is introduced as an intermediary between the grating and the bending mechanism. The elastic member flexibly supports the grating during bending, preventing direct contact and potential damage to the grating structure while maintaining the required arc shape
2Shape
If strong force is applied to bend the grating, then the grating curvature is improved, but the grating may break
Solution Approach 1:
The elastic member serves as a cushioning element that absorbs and distributes the bending force before it reaches the grating. This prevents stress concentration and potential breaking of the grating while still achieving the required curvature
Solution Approach 2:
The bending force is applied gradually and uniformly across the grating surface rather than as a concentrated strong force. The elastic member allows for controlled deformation, changing the stress distribution parameters to achieve curvature without exceeding the grating's strength limits
3Object-generated harmful factors
If the grating is bent to eliminate vignetting, then the radiation distribution is improved, but the signal-to-noise ratio may be reduced
Solution Approach 1:
The arc-shaped grating configuration with the radiation source as the center ensures uniform radiation incidence across the entire grating surface. This geometric design eliminates vignetting and maintains consistent signal intensity, preserving the signal-to-noise ratio while improving radiation distribution
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 apparatus accurately captures moire images and reconstructs differential phase images without damaging the gratings or reducing the signal-to-noise ratio, effectively addressing the issues of grating damage and vignetting.
Implementation Method 1
an elastic member positioned between a first surface of the grating and the pressing surface of the pressing unit or a second surface of the grating opposite of the first surface and the receiving surface of the receiving unit
Implementation Method 2
The second grating is positioned in the position where a self-image of the first grating is focused at a certain interval downstream of the X-ray irradiating direction of the first grating by emitting the X-ray to the first grating from the X-ray source
Implementation Method 3
an X-ray capturing apparatus which uses a Talbot interferometer or Talbot-Lau interferometer and a radiation detector (Flat Panel Detector: FPD) to capture and image a phase shift of an X-ray generated when the X-ray passes through an object
Data Source
AI summary
An X-ray Talbot capturing apparatus is shown. A radiation source irradiates radiation through a plurality of gratings. A radiation detector captures a moire image. A holder which holds the gratings includes a receiving unit including a receiving surface with a curve and a pressing unit including a pressing surface with a curve. Each grating is held between the receiving surface and the pressing surface and bent in an arc shape with a point of the radiation source as a center. An elastic member is positioned between a first surface of the grating and the pressing surface or a second surface of the grating opposite of the first surface and the receiving surface. An opening is provided in the holder and the elastic member so as not to block radiation irradiated on the grating.