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Proceedings Article

Pulse pre-pump method for cm-order spatial resolution of BOTDA

[+] Author Affiliations
Kinzo Kishida, Che-Hien Li

Neubrex Co. Ltd. (Japan)

Ken'ichi Nishiguchi

Mitsubishi Electric Co. (Japan)

Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, 559 (August 30, 2005); doi:10.1117/12.624259
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From Conference Volume 5855

  • 17th International Conference on Optical Fibre Sensors
  • Bruges, Belgium | May 23, 2005

abstract

The distributed Brillouin scattering technique, using pulse width of 1ns, that is, one order of magnitude smaller than currently available in commercial applications of BOTDA, was successfully implemented and examined in laboratory environment by Bao et al. However, the two main problems prohibits its commercial use, namely, the measurement setting must be modified each time the measurements object is changed, and, furthermore, long-range measurements cannot be effectively carried out due to substantial increase in signal noise level with the measurement distance. This paper presents a new technique, which overcomes both of these problems, by introducing the pre-pump pulse in front of standard laser pulse. Theoretical analysis clearly demonstrates that the cm-order distributed sensing, independent of the fiber length, can be realized. Moreover, a quantitative analysis of strain measurement accuracy is also presented.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Kinzo Kishida ; Che-Hien Li and Ken'ichi Nishiguchi
"Pulse pre-pump method for cm-order spatial resolution of BOTDA", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, 559 (August 30, 2005); doi:10.1117/12.624259; http://dx.doi.org/10.1117/12.624259


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