Spatially resolved fibre cavity ring down spectroscopy

Journal article

This paper presents a fibre cavity ring down spectroscopy probed by Rayleigh scattering optical frequency domain reflectometry (OFDR), which provides spatial location of stimuli and improved signal to noise ratio for distributed sensing measurements. A section of optical fibre was integrated into an active fibre ring cavity with optical gain and interrogated by the OFDR system for 11 cycles with a single laser scan. Through the cavity ring down configuration, root-mean-squared (RMS) noise of distributed temperature and strain measurements was reduced to 6.9 mK and less than 0.1 με, respectively for 1-cm spatially resolved measurements. Our work shows that the active fibre cavity configuration can be combined with distributed fibre sensing schemes to achieve both high spatial resolution and high sensitivity measurements.

Authors: Chen, R; Peng, Z; Wang, M; Yan, A; Li, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Nature Research
• Journal: Scientific Reports
• Volume: 10
• Issue: 1
• Pages: 20167-20167
• Publication date: 2020-11-19
• DOI: 10.1038/s41598-020-76721-y
• EISSN: 2045-2322
• ISSN: 2045-2322
• Language: English
• Keywords: Physics; Sensitivity (control systems); Noise (video); Image resolution; Reflectometry; Laser; Distributed acoustic sensing; Cavity ring-down spectroscopy; Spectroscopy; Rayleigh scattering; Electronic engineering; Time domain; Materials science; Fiber optic sensor; Optical fiber; Optical cavity; Optics