Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (2): 158-161.DOI: 10.12068/j.issn.1005-3026.2018.02.002

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Molten Steel Level Measurement Based on Optical Flow Analysis

SU Zhi-qi, HE Qing, XIE Zhi   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2016-09-07 Revised:2016-09-07 Online:2018-02-15 Published:2018-02-09
  • Contact: SU Zhi-qi
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Abstract: In some continuous caster, slag often adheres to the temperature-measuring tube. This phenomenon disturbs the vision-based molten steel level measurement system analyzing the temperature field of the temperature-measuring tube. To solve this problem, the liquid slag adhered on the tube lifted from the molten steel was tracked via optical flow analysis and the adherent characteristic in the different position of the tube was gathered, then the relation between the adherent characteristic and the molten steel level prior to lifting was analyzed, finally the molten steel level in the tundish was calculated. Validated by other methods, the error of this method is less than 3mm. Lots of on-site experiments indicate that this method may well solve the problem of missing temperature data, and accurately measure the molten steel level in the exceptional case of temperature-measuring tube adhering with liquid slag.

Key words: molten steel level, molten slag, temperature-measuring tube, optical flow analysis

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