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Sensors 2019, 19(1), 18; https://doi.org/10.3390/s19010018

Analysis of Residual Stress in Electrical Penetration Assembly Based on a Fiber Bragg Grating Sensor

1
Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Collaborative Innovation Center for Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, China
2
Institute of Nuclear and New Energy Technology, Beijing Key Laboratory of Fine Ceramics, Tsinghua University, Beijing 100084, China
*
Author to whom correspondence should be addressed.
This paper is an extended version of “Stress Monitoring of Sealing Materials in Electrical Penetration Assemblies.” published in the Proceedings of the 26th International Conference on Nuclear Engineering, London, England, 22–26 July, 2018.
Received: 7 November 2018 / Revised: 13 December 2018 / Accepted: 18 December 2018 / Published: 21 December 2018
(This article belongs to the Special Issue Fiber Optic Sensors for Industrial Applications)
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Abstract

An important factor for maintaining hermeticity of a metal-to-glass sealed electrical penetration assembly (EPA) is the residual stress in the sealing glass, which is generated during the EPA sealing process. A novel method to investigate and optimize the sealing process of EPAs, based on a fiber Bragg grating (FBG) sensor, is proposed in this research. An FBG was well bonded with sealing glass to measure the parameters of the glass during the sealing process. The temperature change during the heating process was able to be measured by Bragg wavelength shift. After the sealing glass solidified and dropped to room temperature, the residual stress was determined and the effect of temperature was minimized because the temperature before and after the sealing process was the same as room temperature. The curing temperature of the sealing glass was evaluated to specifically investigate the solidification process of the EPA. This study provides a basis for online stress and temperature monitoring of EPAs under external loads in nuclear power plants. View Full-Text
Keywords: sealing process analysis; residual stress; embeddable technology; fiber Bragg grating; electrical penetration assembly sealing process analysis; residual stress; embeddable technology; fiber Bragg grating; electrical penetration assembly
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fan, Z.; Diao, X.; Zhang, Y.; Liu, M.; Chen, F.; Huang, Z.; Yan, H. Analysis of Residual Stress in Electrical Penetration Assembly Based on a Fiber Bragg Grating Sensor. Sensors 2019, 19, 18.

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