Phase-detected Brillouin optical correlation-domain reflectometry
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Optical fiber sensing techniques based on Brillouin scattering have been extensively studied for structural health monitoring owing to their capability of distributed strain and temperature measurement. Although a higher signal-to-noise ratio (leading to high spatial resolution and high-speed measurement) is generally obtained for two-end-access systems, they reduce the degree of freedom in embedding the sensors into structures, and render the measurement no longer feasible when extremely high loss or breakage occurs at a point of the sensing fiber. To overcome these drawbacks, a one-end-access sensing technique called Brillouin optical correlation-domain reflectometry (BOCDR) has been developed. BOCDR has a high spatial resolution and cost efficiency, but its conventional configuration suffered from relatively low-speed operation. In this paper, we review the recently developed high-speed configurations of BOCDR, including phase-detected BOCDR, with which we demonstrate real-time distributed measurement by tracking a propagating mechanical wave. We also demonstrate breakage detection with a wide strain dynamic range.
KeywordsBrillouin scattering Distributed strain and temperature sensing High-speed measurement Nonlinear optics Optical fiber sensors
The authors wish to acknowledge Tomohito Kawa, Heeyoung Lee, Shumpei Shimada, Makoto Shizuka, Kazunari Minakawa, Hiroki Tanaka, Sho Ikeda, Daisuke Yamane, Hiroyuki Ito, Shiro Dosho, and Kazuya Masu (Institute of Innovative Research, Tokyo Institute of Technology) for their experimental assistance. This work was supported by JSPS KAKENHI Grant Numbers 25709032, 26630180, 25007652, and 17H04930, and by research Grants from the Iwatani Naoji Foundation, the SCAT Foundation, the Konica Minolta Science and Technology Foundation, the Japan Gas Association, the ESPEC Foundation for Global Environment Research and Technology, the Association for Disaster Prevention Research, the Fujikura Foundation, and the Japan Association for Chemical Innovation.
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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