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 language | English |
|---|---|
| Pages (from-to) | 1889-1902 |
| Number of pages | 14 |
| Journal | Optics Express |
| Volume | 25 |
| Issue number | 3 |
| DOIs | |
| State | Published - 6 Feb 2017 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:©2017 Optical Society of America.
Funding
National Key Scientific Instrument and Equipment Development Project of China (2013YQ040815); 863 Program of China (2014AA110401); National Natural Science Foundation of China (NSFC) (61575052, 61308004 and 61605034).
| Funders | Funder number |
|---|---|
| 863 Program of China | 2014AA110401 |
| National Natural Science Foundation of China | 61308004, 61605034, 61575052 |
| National Key Scientific Instrument and Equipment Development Projects of China | 2013YQ040815 |