Variable-Angle Parallel Plate X-Ray Collimator for Peak Resolution
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Solution Overview
Problem
Existing X-ray analysis methods suffer from geometrical aberrations that distort diffraction peaks, particularly at low 2θ angles, due to axial divergence of X-ray beams, leading to challenges in elemental analysis and phase identification, and require trade-offs between peak intensity and measurement time.
Innovation Solution
A parallel plate X-ray collimator with variable acceptance angle, composed of plates with varying lengths and separation distances, adjusts its position to match the angular position of the detector, minimizing axial divergence and maintaining peak intensity across a range of angles without extending into the detector's scanning path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed acceptance angle collimator is used to reduce axial divergence, then measurement precision is improved, but peak intensity is reduced and measurement time increases
Solution Approach 1:
The collimator acceptance angle is made variable through the goniometer mechanism, allowing it to dynamically adjust to match the detector angle throughout the scan. This resolves the contradiction by enabling the system to optimize between resolution and intensity at each measurement point rather than being constrained by a fixed angle.
Solution Approach 2:
The acceptance angle parameter of the collimator is changed as a function of the detector position angle. By varying this parameter throughout the scan, the system maintains optimal resolution at each angle while maximizing peak intensity, thereby reducing required measurement time.
2Adaptability or versatility
If a fixed acceptance angle collimator is used, then device complexity is reduced, but adaptability to different measurement conditions is limited
Solution Approach 1:
The collimator is integrated with the goniometer mechanism to serve multiple functions: it provides mechanical support, defines the acceptance angle, and enables angular adjustment. This multi-functionality achieves adaptability without proportionally increasing device complexity.
Solution Approach 2:
The collimator adjustment mechanism is merged with the existing goniometer that positions the detector. By combining these functions, the system achieves variable acceptance angle capability without adding a separate complex adjustment mechanism.
3Measurement precision
If axial divergence is reduced by limiting acceptance angle, then measurement precision is improved, but peak intensity is reduced
Solution Approach 1:
The acceptance angle is dynamically adjusted to match the detector angle at each position. This allows the system to maintain narrow acceptance angles (for resolution) at low angles while using wider acceptance angles (for intensity) at high angles, optimizing both parameters throughout the scan.
Solution Approach 2:
The acceptance angle parameter is varied as a function of the measurement angle to optimize the balance between resolution and intensity. By changing this parameter adaptively, the system achieves high resolution where needed while maintaining sufficient intensity across the full angular range.
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 enables high-intensity, high-resolution X-ray analysis with minimal geometrical aberrations, reducing measurement time and space constraints, while maintaining optimal peak intensity and resolution throughout the scan.
Implementation Method 1
an X-ray collimator for collimating an X-ray beam in a collimation direction by limiting divergence of an incident X-ray beam
Data Source
AI summary
Embodiments of the present invention provide an X-ray collimator for collimating an incident X-ray beam by limiting divergence of the incident X-ray beam, the X-ray collimator having a variable acceptance angle, an X-ray analysis apparatus comprising an X-ray collimator having a variable acceptance angle and a method of using the X-ray analysis apparatus. The X-ray analysis apparatus comprises a position-sensitive X-ray detector, and the X-ray collimator is arranged between the sample and the position-sensitive X-ray detector to limit axial divergence of X-rays from the sample.