Abstract
In this paper, we demonstrate a novel method of distributed temperature sensing in optical fibers. The method is based on cascading fiber Bragg gratings (FBGs) single-ended Brillouin optical time-domain analyzer (BOTDA). This proposal applies the cascading FBGs both as a reflector and an optical filter to improves the measurement. Experimental results show that a 75-km sensing range with 3°C temperature resolution and 5 m spatial resolution are achieved.
Highlights
The Distributed optical fiber sensors (DOFS) based on Brillouin scattering is much more suitable than those based on Rayleigh and Raman scattering for realizing long distance distributed measurement of temperature or strain
We propose a novel approach for distributed temperature sensing in optical fibers, which is based on cascading fiber Bragg gratings (FBGs) single-ended Brillouin optical time-domain analyzer (BOTDA)
The signals pass through the circulator into cascading tunable narrowband FBGs filters, which are combined with the FBG3 filter and the FBG4 filter
Summary
Optic fiber temperature sensor based on cascading fiber Bragg gratings The research of the long distance distributed optical fiber sensors is mainly focusing on the optical scattering in the optical fiber, including Rayleigh, Raman and Brillouin scattering. The Brillouin scattering is sensitive to both temperature and strain,7 and it is stronger in signal than the Raman scattering around 10dB.
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