| NUCLEAR ENERGY AND NEW ENERGY |
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Prestress measurement during glass-metal sealing based on a fiber sensor |
| LI Mingze1, YAN He1, DIAO Xingzhong1, ZHANG Yong2 |
1. Institute of Nuclear and New Energy Technology, Tsinghua University, the key laboratory of advanced reactor engineering and safety, Ministry of Education, Collaborative Innovation Center for Advanced Nuclear Energy Technology, Beijing 100084, China;
2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing Key Laboratory of Fine Ceramics, Beijing 100084, China |
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Abstract An optical fiber sensing method was developed for prestress measurements of glass-metal seals. A fiber Bragg grating sensor was embedded in a hole in the sealing glass. The glass was then heated to melting, cooled and solidified so that the optical fiber sensor, the glass and the metal shell were sealed together. The fiber sensor gave real-time measurements of the sealing temperature during the sealing. The changes of the Bragg wavelength were used to measure the axial strain along the measurement path in the glass seal. The global stress distribution in the glass was then calculated by a finite element analysis. Tests show that the fiber sensor can monitor the temperature and stress during the sealing process and an optimized sealing process can be achieved by using prestress measurements in the glass as an indicator.
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| Keywords
metal-to-glass sealing
prestress
hermetic seal
electrical penetration assembly
fiber Bragg grating
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Issue Date: 15 July 2018
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2018,
Vol. 58
