Meaning
A mathematical and sensing framework correlates multi-axis optical reflection changes with three-dimensional mechanical deformation vectors across battery cell structural components. Construction of a photomechanical strain matrix enables real-time conversion of fiber optic wavelength shifts into localized strain tensors within electrode stacks or pouch enclosures. Boundaries restrict this analysis to optical sensor networks embedded within or mounted on cell assemblies, excluding external pack mechanical modeling.
Interrogator manufacturers embed these tensor matrix transformations directly into evaluation firmware.
Tensor Calculation
Mathematical transformations convert directional optical wavelength shifts into normal and shear strain components. Matrix multiplication steps account for sensor orientation and fiber photo-elastic coefficients. Resolved tensor values describe complete multi-axial state of strain at each sensing location.
Optical Sensing
Embedded fiber Bragg grating arrays measure localized optical path length variations caused by physical deformation. Coated optical fibers transmit reflected light back to high-resolution interrogator units. High optical sensitivity captures subtle mechanical shifts during early degradation stages.
Deformation Mapping
Integrating data from a photomechanical strain matrix across multiple fiber channels constructs a 3D strain map of active cell regions. Structural anomalies and non-uniform swelling become clearly visible before macroscopic external bulges appear. Advanced mapping capability supports optimized pack restraint design.
