8 March 2014 Improved distributed fiber optic sensing system based on single-ended double-pulse input Brillouin scattering
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Abstract
In a new distributed fiber optic sensing system, single-ended double-pulse input is used to strengthen Brillouin backscattered light by increasing the population of acoustic phonons. The first pulse (pump pulse), has a wide pulsewidth (tens or hundreds of us) and is used to generate a nonlinear population of acoustic phonons in the sensing fiber. Whereas the second pulse (probe pulse) has a different central wavelength and a much narrower pulse-width (several ns), and is emitted into the sensing fiber with a controlled time delay to absorb the generated abundant acoustic phonons, so that strong Anti-Stokes light can be generated. In this way, Brillouin backscattered light can be detected easily, leading to higher signal to noise ratio and better spatial resolution (less than 1 m), as well as good temperature and strain resolution, and longer sensing distance.
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Tianying Chang, Ruijuan Yang, Yongliang Wang, David Y. Li, Lei Jia, Hong-Liang Cui, "Improved distributed fiber optic sensing system based on single-ended double-pulse input Brillouin scattering", Proc. SPIE 9062, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014, 906203 (8 March 2014); doi: 10.1117/12.2043924; https://doi.org/10.1117/12.2043924
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