Slope-assisted BOTDA based on vector SBS and frequency-agile technique for wide-strain-range dynamic measurements

Dengwang Zhou, Yongkang Dong, Benzhang Wang, Taofei Jiang, Dexin Ba, Pengbai Xu, Hongying Zhang, Zhiwei Lu, Hui Li

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

We present a slope-assisted BOTDA system based on the vector stimulated Brillouin scattering (SBS) and frequency-agile technique (FAT) for the wide-strain-range dynamic measurement. A dimensionless coefficient K defined as the ratio of Brillouin phase-shift to gain is employed to demodulate the strain of the fiber, and it is immune to the power fluctuation of pump pulse and has a linear relation of the frequency detuning for the continuous pump and Stokes waves. For a 30ns-square pump pulse, the available frequency span of the K spectrum can reach up to 200MHz, which is larger than fourfold of 48MHz-linewidth of Brillouin gain spectrum. For a single-slope assisted BOTDA, dynamic strain measurement with the maximum strain of 2467.4με and the vibration frequency components of 10.44Hz and 20.94Hz is obtained. For a multi-slope-assisted BOTDA, dynamic measurement with the strain variation up to 5372.9με and the vibration frequency components of 5.58Hz and 11.14Hz is achieved by using FAT to extend the strain range.

Original languageEnglish
Pages (from-to)1889-1902
Number of pages14
JournalOptics Express
Volume25
Issue number3
DOIs
StatePublished - 6 Feb 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
©2017 Optical Society of America.

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