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Meeting MS&T24: Materials Science & Technology
Symposium Machine Learning and Simulations
Presentation Title EBSD Geometry Calibration Through SE(3) Lie Group Optimization
Author(s) Zachary Varley, Marc De Graef, Gregory Rohrer
On-Site Speaker (Planned) Zachary Varley
Abstract Scope We present a novel method for electron backscatter diffraction (EBSD) detector geometry calibration that parametrizes the full 6-degrees-of-freedom detector pose via the special Euclidean group SE(3). Central to this approach is the usage of physics-based forward modeling of backscatter electron signal generation. The core innovation lies in jointly indexing orientations and estimating detector pose by iteratively comparing projected simulation patterns with experimental patterns. Optimization is performed in the Lie algebra tangent space using many experimental patterns from across the region of interest. The algorithm is implemented in PyTorch and validated on standard Nickel EBSD datasets with varied noise levels to quantify the method's noise robustness. The basin of attraction and optimization landscape are compared across metrics. By integrating Lie algebra based optimization with physics-based simulations, a more general model of detector geometry may be fitted, enabling enhanced EBSD measurements compared to standard pattern projection center methods.

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