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Structural Monitoring and Maintenance
  Volume 3, Number 2, June 2016 , pages 145-155

Pulse-Pre Pump Brillouin Optical Time Domain Analysis-based method monitoring structural multi-direction strain
Huaizhi Su, Meng Yang and Zhiping Wen

    The Pulse-Pre Pump Brillouin Optical Time Domain Analysis (PPP-BOTDA) technique is introduced to implement the multi-direction strain measurement. The monitoring principle is stated. The layout scheme of optical fibers is proposed. The temperature compensation formula and its realizing method are given. The experiments, under tensile load, combined bending and tensile load, are implemented to validate the feasibility of the proposed method. It is shown that the PPP-BOTDA technique can be used to discriminate the multi-direction strains with high spatial resolution and precision.
Key Words
    multi-direction strain measurement; PPP-BOTDA; distributed optical fiber; experimental study
Huaizhi Su: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University,
Nanjing 210098, China
Meng Yang: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Zhiping Wen: Department of Computer Engineering, Nanjing Institute of Technology, Nanjing 211167, China

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