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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 33 — Nov. 20, 2008
  • pp: 6202–6206

Fiber optic distributed temperature and strain sensing system based on Brillouin light scattering

Tianying Chang, David Y. Li, Thomas E. Koscica, Hong-Liang Cui, Qingmei Sui, and Lei Jia  »View Author Affiliations

Applied Optics, Vol. 47, Issue 33, pp. 6202-6206 (2008)

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We present an original method to improve the spatial resolution of a Brillouin distributed temperature and strain sensing system (DTSS). This method is shown to substantially improve the spatial resolution, while simultaneously strengthening the Brillouin backscattered light, which is based on the combination of an internal modulation of the laser source and an external modulator to generate two separate light pulses with different central wavelengths and pulse widths. Moreover, a novel Brillouin signal detection method, which we called isogenous heterodyne detection, is introduced, which is equivalent to a heterodyne detection scheme but is only with Rayleigh and Brillouin backscattered light without the need of an extra reference light. These new technical approaches have been incorporated into a fiber optic DTSS with 13 km single-mode fiber, which clearly successfully demonstrated all the advantages over conventional DTSS approaches in theory and the feasibility in experiment.

© 2008 Optical Society of America

OCIS Codes
(040.2840) Detectors : Heterodyne
(130.6010) Integrated optics : Sensors
(290.5830) Scattering : Scattering, Brillouin
(330.6130) Vision, color, and visual optics : Spatial resolution

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: July 22, 2008
Revised Manuscript: October 4, 2008
Manuscript Accepted: October 13, 2008
Published: November 14, 2008

Tianying Chang, David Y. Li, Thomas E. Koscica, Hong-Liang Cui, Qingmei Sui, and Lei Jia, "Fiber optic distributed temperature and strain sensing system based on Brillouin light scattering," Appl. Opt. 47, 6202-6206 (2008)

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