Electronic Science and Technology ›› 2020, Vol. 33 ›› Issue (8): 28-33.doi: 10.16180/j.cnki.issn1007-7820.2020.08.005

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Non-contact Rail Profile Detection System Based on Laser Profiler

BAO Yajun1,LIU Jin1,YANG Haima2,JIANG Shenghua3,YUAN Baolong4,YANG Ping5   

  1. 1. School of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China
    2. School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China
    3. Shanghai Ruilnu Machinery Corp.,Shanghai 200120,China
    4. Shanghai Huaike Intelligent Technology Co., Ltd.,Shanghai 201999,China
    5. Shanghai AerospaceEquipments Manufacturer Co.,Ltd.,Shanghai 200245,China
  • Received:2019-05-27 Online:2020-08-15 Published:2020-08-24
  • Supported by:
    National Natural Science Foundation of China(61701296);National Natural Science Foundation of China(U1831133);Shanghai Natural Science Foundation(17ZR1443500);Shanghai Aerospace Science and Technology Innovation Fund(SAST2017-062);Baoshan District Science and Technology Innovation Special Fund(17-C-21)


At present, the geometrical dimension measurement of the rail profile is mostly based on manual measurement. The high-precision profile detection system based on the laser profiler can improve work efficiency of manual measurement and reduce measurement errors. The median filtering method was used to preprocess the profile data collected by the laser profilometer, and the coordinate system was transformed by coordinate translation and coordinate rotation. Then, the appropriate feature point was selected by quadratic fitting to match the silhouette stitching. After field test, the repeated measurement error of the rail profile size was less than 0.1 mm, and the absolute measurement accuracy was up to 0.014 mm. These experimental value met the requirements of the national standard for the detection accuracy of the rail profile, indicating the proposed method could effectively improve the detection efficiency of the rail.

Key words: rail profile, median filtering, coordinate transformation, laser profiler, profile detection, quadratic fitting

CLC Number: 

  • TP278