Crystalline Surface Orientation Mapping Using Directional Reflectance
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Solution Overview
Problem
Existing optical methods for determining crystallographic orientation are limited by their inability to distinguish different grains and lack the capability to provide full three-dimensional (3D) crystal orientation, while X-ray and electron-based methods are costly and require specialized equipment and high-vacuum environments.
Innovation Solution
A method and apparatus using directional reflectance microscopy (DRM) with advanced data processing techniques to determine 3D crystallographic orientation by analyzing angle-dependent reflectance patterns, employing a collimated light source, image sensing unit, and processor to process pixelated images of reflectance profiles, utilizing Funk-Radon transform to enhance data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray diffraction or electron backscatter diffraction is used to determine crystallographic orientation, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex X-ray or electron-based diffraction systems with a simple optical microscopy system using visible light. Instead of using X-ray diffraction patterns or electron backscatter patterns, the invention uses optical reflectance patterns from crystal surface facets to determine crystallographic orientation, achieving comparable measurement precision with vastly simplified equipment.
Solution Approach 2:
The patent uses conventional, inexpensive optical components (light source, microscope, camera) that are readily available in standard laboratories, replacing costly specialized equipment like synchrotron X-ray sources or electron microscopes. This makes crystallographic orientation measurement accessible without requiring expensive infrastructure.
2Measurement precision
If electron backscatter diffraction is used for local orientation measurement, then measurement precision is improved, but ease of operation deteriorates due to vacuum requirements
Solution Approach 1:
The patent substitutes electron-based diffraction with optical reflectance measurement, eliminating the need for high-vacuum environments and conductive sample preparation. The optical method can be performed on samples in ambient conditions, dramatically improving ease of operation while maintaining the ability to measure local crystal orientation.
3Ease of operation
If existing optical microscopy techniques are used to examine crystalline surfaces, then ease of operation is improved, but measurement precision deteriorates due to inability to distinguish different grains
Solution Approach 1:
The patent exploits the fact that different crystallographic facets reflect light at different angles, creating distinct optical contrast patterns. By analyzing the reflectance patterns and their angular dependence, the method can distinguish between different grains and determine their crystallographic orientations, transforming subtle optical properties into precise measurement data.
Solution Approach 2:
The patent moves from conventional 2D optical imaging to 3D angular-resolved reflectance measurement. By measuring reflectance patterns at multiple angles and analyzing the angular dependence, the method extracts three-dimensional crystallographic orientation information that cannot be obtained from standard optical microscopy alone.
4Device complexity
If conventional optical methods are used for crystal characterization, then device complexity is reduced, but productivity deteriorates due to limited throughput
Solution Approach 1:
The patent implements automated angular scanning where the sample or detector is systematically rotated through a series of predetermined angles, capturing reflectance patterns at each position. This periodic measurement sequence, combined with automated image acquisition and processing, enables high-throughput characterization while maintaining simple optical hardware.
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 rapid, high-throughput determination of local crystallographic orientation on crystalline surfaces, overcoming limitations of existing methods by providing accurate 3D grain orientation information without the need for costly specialized equipment or high-vacuum conditions.
Implementation Method 1
directing a beam of collimated light to strike a spot on the crystalline surface at a predetermined angle of incidence, wherein reflections from the crystalline surface at said spot are projected onto an image sensing unit
Implementation Method 2
The image sensing unit may generate an image of a reflectance pattern based on angle-dependent-reflectance of the crystalline surface sensed by the image sensing unit
Data Source
AI summary
A method of determining 3D crystallographic orientation on a crystalline surface of a sample. The method includes directing a beam of collimated light at a predetermined angle of incidence, wherein reflections from the crystalline surface are projected onto an image sensing unit positioned in a path of reflected light; obtaining a directional reflectance profile from an image of the reflectance pattern generated by the image sensing unit by pixelising the reflectance pattern into a pixelated-image with a center coinciding an intersection of a specularly reflected light beam and the image sensing unit; and processing the directional reflectance profile based on analyzing reflection intensity data in the pixelated-image of the directional reflectance profile to determine the crystallographic orientation of the crystalline surface. A further method including projecting the reflections onto a detector screen and capturing an image of the reflectance pattern on the detector screen.