Research on Twist Calibration Technology in Shape Reconstruction of Multi-Core Fiber Optic Gratings
Due to the geometric defects in the preparation process of multi-core fiber optic gratings and improper placement during packaging,relative angular deviations may occur between the fiber cores in the fiber cross-sections of different discrete measurement points,leading to twisting issues in the fiber cross-sections.With the increase of the distance for 3D shape reconstruction,this twisting problem will accumulate error in the reconstructed coordinates,which ultimately affects the accuracy of 3D shape reconstruction.Therefore,the corresponding shape reconstruction twist calibration experiments are designed and constructed to solve this inherent twisting problem.The experimental results show that this twist calibration method expands the applicable range of the 3D shape reconstruction model and improves the accuracy of the reconstruction results.
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