Surface Defect Detection on Nuclear Power Plant Components Based on Photometric Stereo under Near-Field LED Light

Huang Sanao; Li Ming; Xu Ke; Shi Yingjie

doi:10.13832/j.jnpe.2021.04.0191

Volume 42 Issue 4

Aug. 2021

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Article Navigation > Nuclear Power Engineering > 2021 > 42(4): 191-197

Huang Sanao, Li Ming, Xu Ke, Shi Yingjie. Surface Defect Detection on Nuclear Power Plant Components Based on Photometric Stereo under Near-Field LED Light[J]. Nuclear Power Engineering, 2021, 42(4): 191-197. doi: 10.13832/j.jnpe.2021.04.0191

Citation:

Huang Sanao, Li Ming, Xu Ke, Shi Yingjie. Surface Defect Detection on Nuclear Power Plant Components Based on Photometric Stereo under Near-Field LED Light[J]. Nuclear Power Engineering, 2021, 42(4): 191-197. doi: 10.13832/j.jnpe.2021.04.0191

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Surface Defect Detection on Nuclear Power Plant Components Based on Photometric Stereo under Near-Field LED Light

doi: 10.13832/j.jnpe.2021.04.0191

Huang Sanao^{1, 2
,},
Li Ming²,
Xu Ke¹,
Shi Yingjie¹

1.
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China
2.
CGN Inspection Technology Co., Ltd., Suzhou, Jiangsu, 215000, China

Received Date: 2021-02-26
Rev Recd Date: 2021-04-01

Available Online: 2021-08-11

Publish Date: 2021-08-15

Abstract

Abstract

To improve the visual inspection of nuclear power plant components, this study introduces the technology of three-dimensional reconstruction framework based on photo metric stereo under near-field LED lighting. An iterative algorithm is proposed to estimate the K value of different light sources and the light6 intensities for various image pixels. Combined with the calculation method of the spatial position of the light source and the detected surface points, the light intensity and light direction of different points on the detected surface are estimated under the illumination of near-field LED point light source. A surface defect detection system is designed based on this technology, and it is verified by experiments on surface damage samples and actual nuclear power equipment. The results show that this system can obtain three-dimensional surface data, and for scratch-type defects, it can further achieve accurate depth measurement. Therefore, it can effectively improve the detection ability of surface defects.
- Photometric stereo,
- Near-field LED lighting,
- Light intensities estimation,
- Nuclear power plant components,
- Surface defect

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References(15)

References

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