标题：Improved distributed fiber optic sensing system based on single-ended double-pulse input Brillouin scattering
作者：Chang, Tianying; Yang, Ruijuan; Wang, Yongliang; Li, David Y.; Jia, Lei; Cui, Hong-Liang
作者机构：[Chang, Tianying; Yang, Ruijuan; Cui, Hong-Liang] Jilin Univ, Coll Instrumentat & Elect Engn, Changchun 130023, Jilin, Peoples R China.; [Li, David 更多
会议名称：Conference on Smart Sensor Phenomena, Technology, Networks, and Systems Integration
会议日期：MAR 10-11, 2014
来源：SMART SENSOR PHENOMENA, TECHNOLOGY, NETWORKS, AND SYSTEMS INTEGRATION 2014
关键词：Brillouin scattering; BOTDR; single-ended double-pulse; pump and probe;; spatial resolution
摘要：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 pulse-width (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.