Abstract
A high-temperature all-fiber non-destructive multi-parameter sensing system is developed. The system can operate consistently in a wide range of temperature changes by specially designed active signal generation and detection units. It is capable of monitoring temperature up to 600°C and cracks on metal pipes with an acoustic wave generation unit and an acoustic detection unit. A gold-coated multi-mode fiber is used to deliver a laser pulse for acoustic excitation while minimizing parasitic acoustic signals at high temperature. An in-fiber Fabry–Perot fiber Bragg grating (FP-FBG) is fabricated in another single-mode fiber and bonded to the test object for acoustic detection. The FP-FBG avoids strain redistribution inside the bonder at high temperature to ensure consistent operation. The feasibility of the system for temperature monitoring and crack detection in real-world applications is also demonstrated on an industry-standard P91 pipe.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Chennan Hu, Zhihao Yu, and Anbo Wang
Opt. Express 24(18) 20287-20296 (2016)
Jiun-Yu Sung, Jin-Kai Chen, Shien-Kuei Liaw, Hiroki Kishikawa, and Nobuo Goto
Opt. Lett. 45(19) 5436-5439 (2020)
Mengshi Wu, Chi Li, Xinyu Fan, Changrui Liao, and Zuyaun He
Opt. Lett. 45(13) 3685-3688 (2020)