Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications
Online ISSN : 2188-4749
Print ISSN : 2188-4730
第40回ISCIE「確率システム理論と応用」国際シンポジウム(2008年11月, 京都)
Application of Pulse Compression Techniques to Brillouin Distributed Optical Fiber Sensors
Ken'ichi NishiguchiKinzo Kishida
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2009 年 2009 巻 p. 229-236

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The spatial resolution of strain/temperature measurements using Brillouin scattering in an optical fiber is proportional to the pulse width of a pump laser light. However, because the phonon spectrum is broadened and the signal-to-noise ratio (SNR) decreases if the pulse width is narrowed to improve resolution, it was widely assumed that there existed a practical lower limit for pulse width about 10 ns, resulting in resolution of 1 m. In a previous paper, we proposed a spectral broadening suppression method called pulse-prepump Brillouin optical time-domain analysis (PPP-BOTDA), which was verified to attain a 2 cm resolution. In this paper, we apply the pulse compression techniques used in high-resolution radar to increase the SNR of Brillouin distributed sensors, which leads to far higher accuracy.
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© 2009 ISCIE Symposium on Stochastic Systems Theory and Its Applications
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