Single Crystal X-ray Aperture Minimizing Parasitic Scattering
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Solution Overview
Problem
Conventional X-ray analysis apparatuses face challenges with parasitic scattering at pinhole apertures, leading to reduced signal-to-noise ratio, increased measuring times, and compromised resolution in X-ray diffractometry and small-angle X-ray scattering experiments due to polycrystalline aperture materials.
Innovation Solution
The use of single crystal aperture bodies with a through pinhole that widens like a funnel, minimizing parasitic scattering by preventing total reflections and grain boundary scattering, allowing for reduced number of apertures, increased photon flux, and adjustable beam divergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polycrystalline aperture material is used, then the aperture can be manufactured with standard processes, but parasitic scattering increases leading to reduced signal-to-noise ratio
Solution Approach 1:
The patent changes the fundamental material parameter from polycrystalline to single crystal structure. This eliminates grain boundaries and reduces parasitic scattering, thereby improving the signal-to-noise ratio while maintaining manufacturability through specialized single crystal growth and processing techniques
2Speed
If three pinhole apertures are positioned in sequence to reduce divergence, then beam divergence is controlled, but photon flux is massively reduced and measuring times are prolonged
Solution Approach 1:
The patent extracts the beam divergence control function from the traditional multi-aperture sequence and implements it through a single optimized aperture with specific geometric parameters. This eliminates the need for multiple apertures in sequence, maintaining divergence control while preserving photon flux and reducing measuring time
3Measurement precision
If smaller pinhole apertures are used to maintain resolution with primary beam stops, then resolution is preserved, but photon flux is greatly reduced and measuring time is prolonged
Solution Approach 1:
The patent changes the aperture material parameter to single crystal, which reduces parasitic scattering. This allows the use of larger aperture openings while maintaining resolution, thereby increasing photon flux and reducing measuring time without sacrificing measurement precision
4Ease of manufacture
If polycrystalline aperture material is used, then the aperture structure is simple to manufacture, but Debye-Scherrer rings appear on the detector superimposed on sample signal
Solution Approach 1:
The patent changes the material structure parameter from polycrystalline to single crystal. This eliminates the formation of Debye-Scherrer rings by removing grain boundaries, thereby preserving sample signal purity while the aperture remains manufacturable through single crystal processing techniques
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 enhances the signal-to-noise ratio, reduces measuring times, and improves resolution by minimizing parasitic scattering, enabling higher photon flux and more compact X-ray analysis apparatus designs.
Implementation Method 1
parasitic scattering at the apertures is particularly strong and results in increased measurable intensities around the primary beam stop which are superimposed on the measurement signals of the sample
Implementation Method 2
In case of polycrystalline aperture material, parasitic radiation is generated on grains and grain boundaries
Implementation Method 3
starting from which the pinhole widens in the first area like a funnel in the direction of an outlet opening of the X-ray aperture
Data Source
AI summary
An X-ray analysis apparatus has at least one X-ray aperture (4; 4a, 4b) which delimits an X-ray beam (RS) emitted by an X-ray source (2). The at least one X-ray aperture (4; 4a, 4b) is disposed at a separation from the sample (5) and has a single crystal aperture body (8) with a through pinhole (9). The single crystal aperture body (8) forms a peripheral continuous edge (10) which delimits the X-ray beam (RS) and starting from which the pinhole (9) widens like a funnel in a direction of an outlet opening (11) of the X-ray aperture (4; 4a, 4b) in a first area (B1). The X-ray analysis apparatus reduces impairment of X-ray measurements due to parasitic scattered radiation and at little expense.