Le Wang, Qian Zhou, Yue Fang, Shengchun Wang, Hao Wang, Guoqing Li, Shengwei Ren, Peng Dai, Qiang Han, Fan Wang. Rail Longitudinal Calibration Method for Profile Measurement System[J]. Acta Optica Sinica, 2021, 41(10): 1012004
- Acta Optica Sinica
- Vol. 41, Issue 10, 1012004 (2021)
Fig. 1. Geometric model of line structured light perspective projection
Fig. 2. Schematic diagram of rail profile measurement with line structured light
Fig. 3. Target coordinate system and rail longitudinal direction. (a) Target coordinate system; (b) Z-axis (Ztcs) of target coordinate system is vertical to rail longitudinal direction
Fig. 4. Schematic diagrams of plane target moving on rail surface. (a) Longitudinal rotation around rail; (b) longitudinal translation along rail; (c) rotate around the Z-axis of target coordinate system tcs
Fig. 5. Diagrams of nine typical plane target poses
Fig. 6. Flow chart of rail longitudinal calibration
Fig. 7. Rail profile measurement device with structured light. (a) Rail profile measurement device; (b) flat target is closely attached to top surface of rail; (c) flat target is closely attached to side of rail
Fig. 8. Plane target images under different postures
Fig. 9. Distribution of vectors Vi and the normal of fitting plane
Fig. 10. Schematic diagrams of rail rotation position. (a) Axonometric view; (b) top view
Fig. 11. Rail longitudinal calibration results for 9 rotating positions
Fig. 12. Relationship between rail longitudinal calibration error and number of target images
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Table 1. Coordinates of vector Vi in world coordinate system
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Table 2. Rail longitudinal calibration error
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