X-Ray Reflectometer Arc and Tilt Stage for Large Mirror Metrology
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Solution Overview
Problem
Existing x-ray reflectometers are inadequate for non-destructive characterization of large optical mirrors, such as adaptive mirrors, due to their size and complexity, which affects the quality of x-ray beams and the data obtained.
Innovation Solution
A high-resolution x-ray reflectometer with a sample stage that includes independently controllable vertical lifting stages and a movable arc, along with independently adjustable slits and a monochromator, allowing precise alignment and characterization of large samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional x-ray reflectometers are used to characterize large optical mirrors, then the measurement can be performed, but the measurement precision is insufficient due to the large size of the samples and limited resolution
Solution Approach 1:
The system divides the sample stage into multiple independently controllable vertical lifting stages, each capable of precise positioning. This segmentation allows the large sample to be characterized in sections with high precision while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent introduces vertical lifting motion in addition to horizontal translation, creating a three-dimensional positioning capability. This dimensional addition enables precise alignment and characterization of large samples by moving them through multiple z-height positions, thereby improving measurement precision without proportionally increasing overall system complexity
2Adaptability or versatility
If adaptive mirrors with piezoelectric zones are used, then local deformations can be created, but the device complexity increases due to electronics and multiple components
Solution Approach 1:
The sample stage is designed as a universal platform that can accommodate various mirror types (conventional, multi-layer, adaptive) and sample configurations. The independently controllable vertical lifting stages provide multi-functional positioning capability, allowing the same stage to handle different sample sizes and types without requiring specialized equipment for each
Solution Approach 2:
The system incorporates dynamically adjustable elements including independently controllable vertical lifting stages and tiltable sample stages. These dynamic components allow real-time adjustment of sample position and orientation to accommodate the complex geometry of adaptive mirrors with piezoelectric zones, enabling characterization while managing the added complexity through programmable control
3Adaptability or versatility
If the sample stage is designed to accommodate large thick samples, then the sample capacity increases, but the manufacturing precision of the stage decreases
Solution Approach 1:
The vertical lifting mechanism is segmented into multiple independent stages, each responsible for a portion of the total height adjustment. This segmentation allows each stage to be manufactured with standard precision while the cumulative effect achieves the required large sample accommodation capability, preventing the need for single-stage monolithic precision
Solution Approach 2:
The patent replaces traditional monolithic mechanical positioning with a multi-stage vertical lifting system that uses bearing-supported legs. This mechanical substitution allows large sample thickness accommodation through distributed support points while maintaining positioning accuracy through precise bearing geometry and independent control of each lifting stage
4Measurement precision
If the x-ray source and detector assemblies are positioned on an arc, then the beam path precision is improved, but the device complexity increases
Solution Approach 1:
The patent employs a curved arc geometry for positioning the x-ray source and detector assemblies. This curved configuration provides precise beam path control through the geometry of the arc itself, improving measurement precision while distributing the mechanical complexity across the curved structure rather than requiring complex joint mechanisms at each position
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
Enables high-resolution x-ray beam characterization of large samples with improved accuracy, detecting small aberrations and optimizing alignment for better data resolution.
Implementation Method 1
an x-ray source assembly configured to generate and direct an x-ray beam
Implementation Method 2
a monochromator configured to receive the x-ray beam from the x-ray source and direct the x-ray beam onto the sample
Implementation Method 3
the sample stage is configured to tilt the sample
Implementation Method 4
a detector assembly configured to detect the reflected x-ray beam
Data Source
AI summary
A high-resolution x-ray reflectometer system that is for characterization of mirrors for use with advanced light sources and includes a table, arc, and sample stage. The table and arc may be made of the same material, in some configurations that material is granite. An x-ray source and detector are mounted on the arc. The arc is movable along the surface of the table in a first direction, and the sample stage is moveable on the table surface in a second direction, perpendicular to the first direction. The sample stage can accommodate a sample with a thickness of 5 cm or more. Vertical lifting stages at each end of the sample stage allow for independent height adjustment of the ends, allowing for tiling of the sample. An autocollimator is mounted at the apex of the arc to characterize the tilt of a sample on the sample stage.