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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 8 — Aug. 1, 2014
  • pp: 1721–1729

Real-time and accurate rail wear measurement method and experimental analysis

Zhen Liu, Fengjiao Li, Bangkui Huang, and Guangjun Zhang  »View Author Affiliations


JOSA A, Vol. 31, Issue 8, pp. 1721-1729 (2014)
http://dx.doi.org/10.1364/JOSAA.31.001721


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Abstract

When a train is running on uneven or curved rails, it generates violent vibrations on the rails. As a result, the light plane of the single-line structured light vision sensor is not vertical, causing errors in rail wear measurements (referred to as vibration errors in this paper). To avoid vibration errors, a novel rail wear measurement method is introduced in this paper, which involves three main steps. First, a multi-line structured light vision sensor (which has at least two linear laser projectors) projects a stripe-shaped light onto the inside of the rail. Second, the central points of the light stripes in the image are extracted quickly, and the three-dimensional profile of the rail is obtained based on the mathematical model of the structured light vision sensor. Then, the obtained rail profile is transformed from the measurement coordinate frame (MCF) to the standard rail coordinate frame (RCF) by taking the three-dimensional profile of the measured rail waist as the datum. Finally, rail wear constraint points are adopted to simplify the location of the rail wear points, and the profile composed of the rail wear points are compared with the standard rail profile in RCF to determine the rail wear. Both real data experiments and simulation experiments show that the vibration errors can be eliminated when the proposed method is used.

© 2014 Optical Society of America

OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(170.0110) Medical optics and biotechnology : Imaging systems
(150.0155) Machine vision : Machine vision optics

ToC Category:
Machine Vision

History
Original Manuscript: April 11, 2014
Manuscript Accepted: April 19, 2014
Published: July 9, 2014

Citation
Zhen Liu, Fengjiao Li, Bangkui Huang, and Guangjun Zhang, "Real-time and accurate rail wear measurement method and experimental analysis," J. Opt. Soc. Am. A 31, 1721-1729 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-8-1721


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