High-temperature all-fiber non-destructive multi-parameter sensing system with consistent performance

Journal Article · Tue Mar 17 00:00:00 EDT 2020 · Optics Letters

DOI:https://doi.org/10.1364/OL.386798· OSTI ID:1604815

He, Jiaji ; Hu, Chennan; Hu, Di; Wang, Anbo

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.

• Sponsoring Organization: USDOE
• Grant/Contract Number: FE0007405
• OSTI ID: 1604815
• Journal Information: Optics Letters, Journal Name: Optics Letters Vol. 45 Journal Issue: 7; ISSN 0146-9592
• Publisher: Optical Society of America
• Country of Publication: United States
• Language: English