Le Wang, Qian Zhou, Yue Fang, Shengchun Wang, Guoqing Li, Hao Wang, Shengwei Ren, Peng Dai, Fan Wang. Detection Method of Rail Fastener Fastening State Based on Line Structured Light[J]. Laser & Optoelectronics Progress, 2021, 58(16): 1612002
- Laser & Optoelectronics Progress
- Vol. 58, Issue 16, 1612002 (2021)
Fig. 1. Principle diagram of 3D measurement based on line structured light
Fig. 2. 3D measurement system
Fig. 3. 3D point cloud data acquisition system
Fig. 4. Principle diagram of track 3D point cloud data acquisition
Fig. 5. Flow chart of fastener fastening state detection
Fig. 6. Height distribution of i-th contour
Fig. 7. Cumulative height function G(k,i) of profile i
Fig. 8. Segmentation results of rail and fastener area (sampling interval of left rail is 1 mm)
Fig. 9. Wheel rail contact diagram
Fig. 10. Schematic of non-wear rectangular area outside rail head (sampling interval of left rail profile is 1 mm)
Fig. 11. Flow chart of online updating threshold database
Fig. 12. Static accuracy verification at laboratory. (a) Measuring device; (b) two standard blocks; (c) standard block laser section image; (d) measured profile of standard block
Fig. 13. Dynamic test from scene. (a) 3D measurement module; (b) field installation; (c) 3D reconstruction of rail; (d) measured profile of rail
Fig. 14. Wear measurement error perpendicular to rail from scene
Fig. 15. Bolt heights on both sides of rail. (a) Bolt height distributions on both sides; (b) height difference of bolts on both sides
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Table 1. Static precision at laboratory unit: mm
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Table 2. Judgment results of fastener fastening state
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