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Sensors 2012, 12(1), 334-346; doi:10.3390/s120100334

Computer Vision Based Method and System for Online Measurement of Geometric Parameters of Train Wheel Sets

1
Department of Physics, Zhengzhou University of Light Industry, Zhengzhou, 450002, China
2
Key Laboratory of Luminescence and Optical Information of Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China
3
Library of Zhengzhou University of Light Industry, Zhengzhou, 450002, China
*
Author to whom correspondence should be addressed.
Received: 1 December 2011 / Revised: 20 December 2011 / Accepted: 21 December 2011 / Published: 30 December 2011
(This article belongs to the Section Physical Sensors)
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Abstract

Train wheel sets must be periodically inspected for possible or actual premature failures and it is very significant to record the wear history for the full life of utilization of wheel sets. This means that an online measuring system could be of great benefit to overall process control. An online non-contact method for measuring a wheel set’s geometric parameters based on the opto-electronic measuring technique is presented in this paper. A charge coupled device (CCD) camera with a selected optical lens and a frame grabber was used to capture the image of the light profile of the wheel set illuminated by a linear laser. The analogue signals of the image were transformed into corresponding digital grey level values. The ‘mapping function method’ is used to transform an image pixel coordinate to a space coordinate. The images of wheel sets were captured when the train passed through the measuring system. The rim inside thickness and flange thickness were measured and analyzed. The spatial resolution of the whole image capturing system is about 0.33 mm. Theoretic and experimental results show that the online measurement system based on computer vision can meet wheel set measurement requirements.
Keywords: wheel set; calibration; computer vision; optoelectronic technique; mapping function method wheel set; calibration; computer vision; optoelectronic technique; mapping function method
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Zhang, Z.-F.; Gao, Z.; Liu, Y.-Y.; Jiang, F.-C.; Yang, Y.-L.; Ren, Y.-F.; Yang, H.-J.; Yang, K.; Zhang, X.-D. Computer Vision Based Method and System for Online Measurement of Geometric Parameters of Train Wheel Sets. Sensors 2012, 12, 334-346.

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