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Imaging and measuring methods for coating layer thickness of TRISO-coated fuel particles with high accuracy
Yang, Min1; Zhang, Jianhai2; Song, Sung-Jin2; Li, Xingdong3; Meng, Fanyong4; Kang, To2; Liu, Wenli3; Wei, Dongbo1
Source PublicationNDT & E INTERNATIONAL
AbstractTRISO-coated fuel particles are the main innovation of high-temperature gas-cooled reactors (HTGRs), which effectively improve the safety of reactors for higher stability at high temperature. The structure of the typical ball-type TRISO-coated fuel particle comprises a nuclear fuel particle as a kernel and four outer coating layers. These layers play an important role as a barrier against fission product diffusion, and ensuring the integrity of the particles. As one of the key quality parameters of TRISO particles, the coating layer thickness must be measured accurately by non-destructive means. Conventional X-ray radiography, which is based on attenuation contrast, is a non-destructive alternative to measure the coating layer thickness. However, the attenuation contrast is determined by the density difference of the material. For the weakly absorbing material of coating layers composed of carbon and silicon, the variations of the thickness and density of different coating layers are not large enough to realize accurate thickness measurement. In order to obtain ideal images with enhanced boundaries, we applied in-line phase contrast imaging (PCI) based on a micro-focus X-ray source for the inspection of fuel particles. The method is more powerful for acquiring radiographs with sharper edges than conventional X-ray radiography. An improved NL-means method was adopted to decrease the image noise while preserving the detailed information effectively. Finally, based on the denoised DR image with sharper boundaries obtained by PCI, edge detection with sub-pixel accuracy and thickness measurement results are shown. (C) 2013 Elsevier Ltd. All rights reserved.
KeywordTriso-coated Fuel Particle Thickness Measurement X-ray Phase Contrast Imaging Image Denoising Edge Detection
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Characterization & Testing
WOS IDWOS:000316374000012
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Beijing Univ Aeronaut & Astronaut, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
2.Sungkyunkwan Univ, Sch Mech Engn, Suwon 440746, South Korea
3.Natl Inst Metrol, Beijing 100013, Peoples R China
4.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Yang, Min,Zhang, Jianhai,Song, Sung-Jin,et al. Imaging and measuring methods for coating layer thickness of TRISO-coated fuel particles with high accuracy[J]. NDT & E INTERNATIONAL,2013,55(0):82-89.
APA Yang, Min.,Zhang, Jianhai.,Song, Sung-Jin.,Li, Xingdong.,Meng, Fanyong.,...&Wei, Dongbo.(2013).Imaging and measuring methods for coating layer thickness of TRISO-coated fuel particles with high accuracy.NDT & E INTERNATIONAL,55(0),82-89.
MLA Yang, Min,et al."Imaging and measuring methods for coating layer thickness of TRISO-coated fuel particles with high accuracy".NDT & E INTERNATIONAL 55.0(2013):82-89.
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