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Techniques Used for Registration and Reconditioning of Infrared Images of the Experimental Advanced Superconducting Tokamak (EAST) Divertor

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Abstract

The heat flux loaded on the divertor is an important issue in tokamaks. At present, the heat flux on the divertor is calculated from the divertor surface temperature measured by the infrared (IR) camera. However, the movement of the field of view and the geometrical distortion are present in the IR images. Small movements occur with machine shaking during normal discharges, while large ones often arise at disruptions or the rapid variations in the magnetic field. As a result, it is difficult to obtain the real temperature evolution on the specified divertor surface from the IR images. In this paper, the scale invariant feature transform descriptors and K-means clustering have been applied for vibration correction on the IR videos in EAST. The projective transformation is used to correct the geometrical distortion in the IR images. The experimental results show that the proposed methods are efficient in compensating for image translations brought about by vibrations and for perspective distortions in the images, thereby allowing assignment of the IR emission-derived surface temperatures to the correct locations on the divertor surface.

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Acknowledgements

This study was funded by the National Natural Science Foundation of China (Grant No. 11705128) and National Key Research and Development Program of China (No. 2017YEF0301104).

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Authors and Affiliations

  1. Tongling University, 1335 Cuihu 4th Road, Tongling, 244000, Anhui, China

    Zhendong Yang, Yue Wang, Chengwen Zhang & Pei He

  2. Anhui Tongfeng Electronics Co. Ltd, Tongling, 244000, China

    Zhendong Yang & Bing Tang

  3. School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei, 230009, China

    Shuangbao Shu

  4. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Jiayuan Zhang

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  1. Zhendong Yang
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  2. Yue Wang
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  3. Chengwen Zhang
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  5. Shuangbao Shu
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  7. Bing Tang
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Correspondence to Zhendong Yang.

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Yang, Z., Wang, Y., Zhang, C. et al. Techniques Used for Registration and Reconditioning of Infrared Images of the Experimental Advanced Superconducting Tokamak (EAST) Divertor. J Fusion Energ 39, 184–191 (2020). https://doi.org/10.1007/s10894-020-00251-8

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  • DOI: https://doi.org/10.1007/s10894-020-00251-8

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