Chinese Journal of Lasers, Volume. 49, Issue 6, 0604002(2022)
Correction Method for Laser Noncoplanar Error for Rail Profile Measurement System
Figures & Tables(17)
Fig. 2. Schematic of rail profile full section measurement with line structured light
Fig. 3. Schematic of laser coplanar installation. (a) Laser coplanar installation; (b) profile measurement result
Fig. 4. Schematic of two sides of laser noncoplanar installation. (a) Laser noncoplanar installation; (b) profile measurement result
Fig. 6. Schematic of establishing reference coordinate system from rail longitudinal direction
Fig. 7. Flow chart of laser noncoplanar error correction for rail profile measurement system
Fig. 8. Schematic of experimental setup. (a) Experimental setup; (b) lasers on both sides are not coplanar; (c) lasers on both sides are coplanar
Fig. 9. Schematic of three groups of comparative experiments. (a) Lasers on both sides are coplanar and both laser planes are perpendicular to the rail longitudinal direction; (b) lasers on both sides are not coplanar and the left laser plane is not perpendicular to the rail longitudinal direction; (c) lasers on both sides are not coplanar and both laser planes are not perpendicular to the rail longitudinal direction
Fig. 12. Measurement results of rail profile in experiment 2. (a) Before error correction; (b) after error correction
Fig. 13. Measurement results of rail profile in experiment 3. (a) Before error correction; (b) after error correction
Table 1. Calibration results of camera internal parameters
View tableTable 1. Calibration results of camera internal parameters
Parameter Left camera Right camera f /mm 12.70 12.89 k1 /m－2 1210.17 1240.89 k2 /m－4 －6.22×105 －2.41×106 k3 /m－6 －5.82×1010 －1.31×1010 p1 /m－1 －0.12 －0.05 p2 /m－1 0.25 －0.01 sx /m 6.00×10－6 6.01×10－6 sy /m 6.00×10－6 6.00×10－6 cx 1271.29 1260.64 cy 510.94 486.01 Width /pixel 2560 2560 Height /pixel 832 832
Table 2. Calibration results of laser plane parameters
View tableTable 2. Calibration results of laser plane parameters
Laser plane parameter a1 b1 c1 d1 a2 b2 c2 d2 Experiment 1 －0.005 0.002 1.000 －0.032 0 0 1 0 Experiment 2 0.064 0.001 0.997 0.170 0 0 1 0 Experiment 3 0.064 0.001 0.997 0.170 0 0 1 0
Table 3. Calibration results of rail longitudinal parameters
View tableTable 3. Calibration results of rail longitudinal parameters
Rail longitudinal parameter xwcs ywcs zwcs Experiment 1 0.002 －0.003 1 Experiment 2 0.002 －0.003 1 Experiment 3 0.052 －0.017 0.998
Table 4. Average measurement error of rail wearunit：mm
View tableTable 4. Average measurement error of rail wearunit：mm
State Experiment 1 Experiment 2 Experiment 3 Eh Ev Eh Ev Eh Ev Before error correction 0.052 0.047 0.197 0.102 0.119 0.067 After error correction - - 0.059 0.047 0.062 0.038
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Le Wang, Hao Wang, Fan Wang, Shengchun Wang, Qiang Han, Yue Fang, Peng Dai, Guoqing Li, Shengwei Ren. Correction Method for Laser Noncoplanar Error for Rail Profile Measurement System[J]. Chinese Journal of Lasers, 2022, 49(6): 0604002
Paper Information
Category: Measurement and metrology
Received: Jul. 12, 2021
Accepted: Aug. 24, 2021
Published Online: Mar. 2, 2022
The Author Email: Wang Shengchun (wangshengchun@rails.cn), Ren Shengwei (rsw@rails.cn)
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