Abstract
A unique multiparameter sensor for distributed measurement of temperature and strain based on spontaneous Brillouin scattering in polyimide-coated optical fiber is proposed, which is an excellent candidate for the cross-sensitivity problem in conventional Brillouin sensing network. In the experimental section, the discrimination of strain and temperature is successfully demonstrated by analysing the unequal sensing coefficients of the Brillouin frequency shifts generated by different acoustic modes. The Brillouin frequency shifts of the main two peaks are successfully measured to discriminate the strain and temperature with an accuracy 19.68 με and 1.02°C in 2.5 km sensing range. The proposed distributed Brillouin optical fiber sensor allows simultaneous measurement of temperature and strain, thus opening a door for practical application such as oil explorations.
Highlights
Brillouin scattering is one of the most prominent optical effects
To data, distributed sensing measurement systems based on Brillouin scattering effects have been previously realized using several techniques [11,12,13,14]: Brillouin optical correlation domain analysis (BOCDA), Brillouin optical frequency domain analysis (BOFDA), Brillouin optical time domain analysis (BOTDA), Brillouin optical correlation domain reflectometry (BOCDR), Brillouin optical frequency domain reflectometry (BOFDR), and Brillouin optical time domain reflectometry (BOTDR)
We propose and experimentally report a novel BOTDR scheme, for what we believe to be the first time, which employs a polyimide-coated optical fiber with different temperature and strain coefficients in core as the sensing fiber to monitor the distributed temperature and strain simultaneously in harsh environments. is presented method needs only the measurement of Brillouin frequency shifts of the BGSs and can simultaneously achieve the high spatial resolution and accuracy of temperature and strain measurement without modifying the sensing fiber under test (FUT)
Summary
Brillouin scattering is one of the most prominent optical effects. It has been broadly studied for several decades and gained rapid progress in pulse shaping (time domain and frequency domain) [1,2,3,4,5], the amplification of weak signals [6,7,8], and in distributed strain/temperature sensors in recent years [9, 10]. Temperature and strain are the most common measurement parameters for Brillouin-based fiberoptic sensors, as these are the quantities to which the optical sensing fibers are inherently sensitive. The temperature and strain cross-sensitivity problem is deteriorating the sensing performance of the single-mode fiber- (SMF-) based Brillouin sensors. Some groups combine stimulated Brillouin scattering (SBS) with stimulated Raman scattering (SRS) to remove the joint crosstalk effects of multiple
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