High-spatial-resolution fast BOTDA for dynamic strain measurement based on differential double-pulse and second-order sideband of modulation

Yongkang Dong, Dexin Ba, Taofei Jiang, Dengwang Zhou, Hongying Zhang, Chengyu Zhu, Zhiwei Lu, Hui Li, Liang Chen, Xiaoyi Bao

Research output: Contribution to journalArticlepeer-review

114 Scopus citations

Abstract

We demonstrate a high-spatial-resolution fast Brillouin optical time-domain analysis (BOTDA) for distributed dynamic strain measurement based on differential double-pulse and second-order sideband of modulation. The frequency-agility probe wave is obtained from the second-order sideband of the modulated light by using the microwave signal from a wideband arbitrary waveform generator (AWG), which reduces the bandwidth requirement of the AWG by half to ∼5.5 GHz. The differential double-pulse scheme is proposed to improve the spatial resolution while keeping the capability of dynamic measurement. In experiment, a spatial resolution of 20 cm is achieved by using a 52/50 ns differential double-pulse, and the distributed vibration measurement is demonstrated over a 50-m Panda polarization-maintaining fiber observing the vibration frequency of up to 50 Hz. With only five averages, the standard deviation of the strain accuracy is measured to be 14 μe.

Original languageEnglish
Article number2600407
JournalIEEE Photonics Journal
Volume5
Issue number3
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Brillouin optical time-domain analysis (BOTDA)
  • dynamic measurement
  • high spatial resolution
  • strain measurement

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