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Application of Regenerated Phase-Shifted Fiber Bragg Grating Sensors to Acoustic Emission Detection Under Elevated Temperature
Structural health monitoring (SHM) techniques applicable in high-temperature environments are necessary for monitoring the integrity of heat-resistant civil structures, such as thermal and nuclear power plants. Acoustic emission (AE) detection can be potentially used to establish the real-time passive SHM method. Conventional AE sensors are made from piezoelectric materials, whose operational temperature is limited up to 200 °C. Hence, it is difficult to use those AE sensors at elevated temperatures. As an alternative, optical fiber sensors are potential for developing high-temperature sensing technologies because they are fabricated from silica glass with excellent heat resistance over 1000 °C. As a kind of optical fiber sensors, highly sensitive fiber Bragg grating (FBG) sensors have been widely used in AE detection. However, the diffraction grating of the FBG disappears at temperatures over 600 °C. To solve the issue, we proposed a new FBG-based AE sensing system with a regenerated fiber Bragg grating (RFBG). The RFBG is fabricated by annealing the conventional FBG at a high temperature of 920 °C. During the annealing process, the seed FBG once disappears completely, and then a new grating is regenerated again, which has an excellent heat-resistance property. The RFBG was then applied to detect simulated AE waves that were excited by a laser irradiation on the surface of a ceramic plate in a high-temperature furnace heated up to 1000 °C. As a result, our proposed RFBG sensing system succeeded in the detection of the simulated AE waves at elevated temperatures. Based on the experimental results, we believe that the use of RFBG sensors contributes to establishing an RFBG-based high-temperature SHM technique.
Application of Regenerated Phase-Shifted Fiber Bragg Grating Sensors to Acoustic Emission Detection Under Elevated Temperature
Structural health monitoring (SHM) techniques applicable in high-temperature environments are necessary for monitoring the integrity of heat-resistant civil structures, such as thermal and nuclear power plants. Acoustic emission (AE) detection can be potentially used to establish the real-time passive SHM method. Conventional AE sensors are made from piezoelectric materials, whose operational temperature is limited up to 200 °C. Hence, it is difficult to use those AE sensors at elevated temperatures. As an alternative, optical fiber sensors are potential for developing high-temperature sensing technologies because they are fabricated from silica glass with excellent heat resistance over 1000 °C. As a kind of optical fiber sensors, highly sensitive fiber Bragg grating (FBG) sensors have been widely used in AE detection. However, the diffraction grating of the FBG disappears at temperatures over 600 °C. To solve the issue, we proposed a new FBG-based AE sensing system with a regenerated fiber Bragg grating (RFBG). The RFBG is fabricated by annealing the conventional FBG at a high temperature of 920 °C. During the annealing process, the seed FBG once disappears completely, and then a new grating is regenerated again, which has an excellent heat-resistance property. The RFBG was then applied to detect simulated AE waves that were excited by a laser irradiation on the surface of a ceramic plate in a high-temperature furnace heated up to 1000 °C. As a result, our proposed RFBG sensing system succeeded in the detection of the simulated AE waves at elevated temperatures. Based on the experimental results, we believe that the use of RFBG sensors contributes to establishing an RFBG-based high-temperature SHM technique.
Application of Regenerated Phase-Shifted Fiber Bragg Grating Sensors to Acoustic Emission Detection Under Elevated Temperature
Lecture Notes in Civil Engineering
Wu, Zhishen (Herausgeber:in) / Nagayama, Tomonori (Herausgeber:in) / Dang, Ji (Herausgeber:in) / Astroza, Rodrigo (Herausgeber:in) / Li, Zixuan (Autor:in) / Yu, Fengming (Autor:in) / Saito, Osamu (Autor:in) / Okabe, Yoji (Autor:in)
Experimental Vibration Analysis for Civil Engineering Structures ; Kapitel: 16 ; 173-182
24.08.2022
10 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Structural health monitoring , High-temperature environment , Acoustic emission , Optical fiber sensor , Regenerated fiber Bragg grating Engineering , Civil Engineering , Vibration, Dynamical Systems, Control , Mechanical Engineering , Structural Materials , Cyber-physical systems, IoT , Professional Computing
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