Multilayer Mirror X-ray Optical System for Small Angle Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In X-ray small angle optical systems, achieving high small angle resolution is challenging due to increased air scattering and background noise when the sample is fixed at the focal point, limiting the movement of the detector and making it difficult to cover the gap between the sample and detector with a vacuum pass, while also dealing with pseudo-focus regions caused by finite-size X-ray sources and imperfect crystals.
Innovation Solution
An X-ray small angle optical system is designed with a multilayer mirror having a specific mosaicity to create a pseudo-parallel beam region between the mirror and the focal point, allowing the sample to be positioned and moved within this region for improved angular resolution, and featuring a long focal length and improved processing accuracy to maintain a stable X-ray flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the sample is fixed at the focal point to achieve strong X-ray flux, then the X-ray intensity at the sample position is improved, but the detector movement is limited and air scattering increases background noise
Solution Approach 1:
The patent introduces a vacuum pass as an intermediary medium between the sample and detector to replace air. This eliminates air scattering of X-rays, reducing background noise and improving the signal-to-noise ratio, thereby enabling better small angle resolution while maintaining the sample at the focal point for strong X-ray flux
2Measurement precision
If the gap between sample and detector is covered with vacuum pass, then background noise is reduced, but the detector becomes difficult to implement when it becomes large
Solution Approach 1:
The patent creates a pseudo-parallel beam region by positioning the sample upstream of the focal point rather than at the focal point. This dimensional repositioning in the optical path allows the formation of a parallel beam region that extends the effective measurement range and accommodates larger detectors without requiring complex vacuum pass implementations
3Length of stationary object
If a multilayer mirror with improved processing accuracy is used, then the pseudo-parallel beam region is extended, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the multilayer mirror including the mosaicity distribution (controlling the spread of crystal orientations), layer thickness, and focal length. By carefully controlling these parameters, the patent extends the pseudo-parallel beam region length while managing the manufacturing precision requirements through parameter optimization rather than requiring extreme precision across all dimensions
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 configuration enhances the achievable small angle resolution by minimizing beam size variations and increasing the measurement range, reducing background noise and improving the signal-to-noise ratio, while allowing for a larger detector implementation.
Implementation Method 1
a multilayer mirror 12 having an elliptical reflection surface... causing the X-rays to be reflected by the multi-layer mirror
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is an X-ray small angle optical system, which easily achieves a desired angular resolution, including: an X-ray source having a microfocus; a multilayer mirror having an elliptical reflection surface, and being configured to collect X-rays emitted from the X-ray source and to irradiate a sample; and an X-ray detector configured to detect scattered X-rays generated from the sample, in which the elliptical reflection surface of the multilayer mirror has a focal point A and a focal point B, in which the X-ray source is arranged such that the microfocus includes the focal point A, and in which the X-ray detector is arranged on the multilayer mirror side of the focal point B.