X-ray Detection Apparatus Aberration Suppression via Selective Masking
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Solution Overview
Problem
X-ray detection apparatuses face challenges in reducing aberration caused by the mirror unit, especially when a single mirror unit is shared among multiple diffraction gratings with different characteristics, leading to suboptimal light collection and increased aberration issues.
Innovation Solution
Incorporating a mask member between the observation point and the mirror unit to selectively cover portions of the reflective surface that cause aberration, allowing for tailored light collection and aberration suppression based on the diffraction grating in use, thereby enhancing sensitivity and reducing aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single mirror unit is shared by multiple diffraction gratings, then cost and space are reduced, but aberration suppression becomes very difficult for all diffraction gratings
Solution Approach 1:
The reflective surface of the mirror unit is segmented into multiple regions, each corresponding to a specific diffraction grating. A mask member is introduced to selectively mask specific regions of the reflective surface depending on which diffraction grating is being used, thereby suppressing aberrations for each grating individually while sharing a common mirror unit
Solution Approach 2:
A mask member is introduced as an intermediary element between the mirror unit and the diffraction gratings. This mask member selectively blocks specific regions of the reflective surface to suppress aberrations caused by light reflected from unwanted regions, enabling precise control over which parts of the mirror contribute to the optical path for each grating
2Measurement precision
If the mirror unit uses an ideal shape to prevent aberration, then measurement precision is improved, but cost increases
Solution Approach 1:
Instead of manufacturing an expensive ideal-shaped mirror unit, the patent extracts and masks only the specific regions of the reflective surface that cause aberrations. This allows the use of a simpler, cheaper mirror unit shape while still achieving aberration suppression by selectively blocking problematic regions with a mask member
Solution Approach 2:
The mask member serves as a cost-effective solution compared to manufacturing an ideal-shaped mirror. The mask can be a simple opaque structure that selectively blocks aberration-causing regions, providing a low-cost alternative to precision-machined mirror surfaces
3Measurement precision
If the mirror unit collects more light, then sensitivity is improved, but aberration occurrence increases
Solution Approach 1:
Different regions of the mirror unit's reflective surface are treated differently through selective masking. Regions that provide good light collection are left open, while regions that cause aberrations are masked. This local differentiation allows the system to collect sufficient light while suppressing aberrations from specific problematic areas
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 effectively reduces aberration and improves light collection sensitivity by selectively masking aberration-causing areas of the mirror unit, allowing for appropriate light collection for each diffraction grating, even when a single mirror unit is shared across multiple gratings.
Implementation Method 1
a mirror unit having a reflective surface which applies light collection on an X-ray from an observation point on a sample
Implementation Method 2
a spectroscopic device that applies spectral dispersion on an X-ray from the mirror unit, to thereby generate a dispersed X-ray which is spatially spread
Implementation Method 3
a mask member that is provided between the observation point and the mirror unit, and that partially covers the reflective surface, to thereby limit a reflective X-ray which is reflected by the reflective surface and reaches the spectroscopic device
Data Source
AI summary
A mask member is provided at an entrance opening of a mirror unit. Of a first diffraction grating and a second diffraction grating, when the second diffraction grating is used, the mask member masks preceding mirrors. With this process, aberration caused by reflective X-ray is suppressed. When the first diffraction grating is used, the mask member does not function. Alternatively, the mask member and another mask member may be selectively used.