Chinese Journal of Lasers, Volume. 48, Issue 16, 1604004(2021)
Research on the Simulation Model of Rail Profile Measurement System Based on Zemax
Figures & Tables(25)
Fig. 2. Schematic diagram of rail profile measurement system with line structured light
Fig. 7. Standard 60 kg/m rail. (a) Main parameters of cross section; (b) optical model
Fig. 8. Line structured light profile measurement component. (a) Main optical structure parameters; (b) optical simulation model of component
Fig. 10. System calibration module modeling. (a) Calibration target; (b) optical model of calibration target; (c) calibration of camera internal parameters; (d) calibration of laser plane
Fig. 13. Partial images collected by the simulation model for camera internal parameter calibration. (a) Left camera; (b) right camera
Fig. 14. Images collected by the simulation model for laser plane calibration. (a) Left camera; (b) right camera
Fig. 15. Component accuracy verification experiment. (a) Gauge block model; (b) measuring device of simulation; (c) laser cross section image of gauge block; (d) measurement result of gauge block
Fig. 16. Simulation measurement experiment of rail profile. (a) Model of worn rail; (b) simulation measuring device; (c)(d) image of laser cross section on left and right side of rail; (e) profile measurement result
Fig. 17. Practical measurement experiment of rail profile. (a) Worn rail; (b) experimental device; (c)(d) image of laser cross section on left and right side of rail; (e) profile measurement result
Fig. 18. Measurement results of rail vertical wear based on actual measurement system and simulation model
Fig. 19. Cross section energy distribution of line structured light. (a)(b) Actual situation; (c)(d) simulation model
Table 1. Main parameters of line laser
View tableTable 1. Main parameters of line laser
Wavelength /nm Power /mW Line width /@350 mm Divergence angle /(°) Fan angle /(°) 650 498 0.15 0.19 68
Table 2. Main parameters of camera
View tableTable 2. Main parameters of camera
Surface type X half width /mm Y width /mm X/ pixel Y/ pixel Detector rectangle 7.680 2.496 2560 832
Table 3. Calibration results of system simulation model
View tableTable 3. Calibration results of system simulation model
Parameter name Left component Right component Inter camera parameter f /mm 12.12 12.09 k1 /m-2 1351.76 1223.18 k2 /m-4 -4.67×106 9.00×105 k3 /m-6 -3.76×1011 -4.75×1011 p1 /m-1 -0.09 0.23 p2 /m-1 0.120 0.003 sx /m 6.01×10-6 6.02×10-6 sy /m 6.00×10-6 6.00×10-6 cx 1293.64 1258.34 cy 420.41 407.69 Width 2560 2560 Height 832 832 Laser plane parameter tx /mm 2.99 2.12 ty /mm 1.46 0.46 tz /mm 0.03 -0.05 rx /(°) 270.14 90.14 ry /(°) 0 0 rz /(°) 0.10 0.13
Table 4. Depth measurement error of simulation model of line structured light profile measurement component
View tableTable 4. Depth measurement error of simulation model of line structured light profile measurement component
Position Start Middle End Error /mm 0.01 0.02 0.04
Table 5. Statistical results of rail wear measurement unit: mm
View tableTable 5. Statistical results of rail wear measurement unit: mm
Nominal value of rail wear Actual measurement system System simulation model MAE RMSE MAE RMSE 11.00 0.084 0.066 0.049 0.049
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Le Wang, Yue Fang, Shengchun Wang, Hao Wang, Guoqing Li, Shengwei Ren, Peng Dai, Qiaofeng Tan. Research on the Simulation Model of Rail Profile Measurement System Based on Zemax[J]. Chinese Journal of Lasers, 2021, 48(16): 1604004
Paper Information
Category: measurement and metrology
Received: Nov. 24, 2020
Accepted: Dec. 31, 2020
Published Online: Jul. 22, 2021
The Author Email: Hao Wang (wanghao1984@rails.cn)
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