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Li F, Spagnul S, Odedo V, et al. Monitoring Surface Defects Deformations and Displacements in Hot Steel Using Magnetic Induction Tomography. Sensors (Basel). 2019;19(13)doi: 10.3390/s19133005.
Li, F., Spagnul, S., Odedo, V., & Soleimani, M. (2019). Monitoring Surface Defects Deformations and Displacements in Hot Steel Using Magnetic Induction Tomography. Sensors (Basel, Switzerland), 19(13), . https://doi.org/10.3390/s19133005
Li, Fang, et al. "Monitoring Surface Defects Deformations and Displacements in Hot Steel Using Magnetic Induction Tomography." Sensors (Basel, Switzerland) vol. 19,13 (2019). doi: https://doi.org/10.3390/s19133005
Li F, Spagnul S, Odedo V, Soleimani M. Monitoring Surface Defects Deformations and Displacements in Hot Steel Using Magnetic Induction Tomography. Sensors (Basel). 2019 Jul 08;19(13). doi: 10.3390/s19133005. PMID: 31288426; PMCID: PMC6650963.
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Sensors (Basel). 2019 Jul 08;19(13). doi: 10.3390/s19133005.

Monitoring Surface Defects Deformations and Displacements in Hot Steel Using Magnetic Induction Tomography.

Sensors (Basel, Switzerland)

Fang Li, Stefano Spagnul, Victor Odedo, Manuchehr Soleimani

Affiliations

  1. Engineering Tomography Lab (ETL), University of Bath, Bath, BA2 7AY, UK.
  2. Product Division, Ergolines lab s.r.l., Area Science Park, Bldg. R3 Padriciano, Trieste 34149, Italy.
  3. Engineering Tomography Lab (ETL), University of Bath, Bath, BA2 7AY, UK. [email protected].

PMID: 31288426 PMCID: PMC6650963 DOI: 10.3390/s19133005

Abstract

Magnetic Induction Tomography (MIT) is a non-invasive imaging technique that has been widely applied for imaging materials with high electrical conductivity contrasts. Steel production is among an increasing number of applications that require a contactless method for monitoring the casting process due to the high temperature of hot steel. In this paper, an MIT technique is proposed for detecting defects and deformations in the external surfaces of metal, which has the potential to be used to monitor the external surface of hot steel during the continuous casting process. The Total Variation (TV) reconstruction algorithm was developed to image the conductivity distributions. Nonetheless, the reconstructed image of the deformed square metal obtained using the TV algorithm directly does not yield resonable images of the surface deformation. However, differential images obtained by subtracting the image of a perfect square metal with no deformations from the image obtained for a deformed square metal does provide accurate and repeatable deformation information. It is possible to obtain a more precise image of surface deformation by thresholding the differential image. This TV-based threshold-differencing method has been analysed and verified from both simulation and experimental tests. The simulation results reported that 0.92 % of the image region can be detected, and the experimental results indicated a 0.57 % detectability. Use of the proposed method was demonstareted in a MIT device which was used in continuous casting set up. The paper shows results from computer simulation, lab based cold tests, and real life data from continoeus cating demonstating the effectiveness of the proposed method.

Keywords: Magnetic Induction Tomography; continuous casting; imaging defects; imaging deformations; threshold-differencing algorithms; total variation algorithms

References

  1. Med Phys. 2011 Nov;38(11):6275-84 - PubMed
  2. IEEE Trans Med Imaging. 1998 Apr;17(2):285-93 - PubMed

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