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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 30 — Oct. 20, 2012
  • pp: 7268–7275

Integrated hybrid Raman/fiber Bragg grating interrogation scheme for distributed temperature and point dynamic strain measurements

Farhan Zaidi, Tiziano Nannipieri, Marcelo A. Soto, Alessandro Signorini, Gabriele Bolognini, and Fabrizio Di Pasquale  »View Author Affiliations

Applied Optics, Vol. 51, Issue 30, pp. 7268-7275 (2012)

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We propose and experimentally demonstrate the feasibility of an integrated hybrid optical fiber sensing interrogation technique that efficiently combines distributed Raman-based temperature sensing with fiber Bragg grating (FBG)-based dynamic strain measurements. The proposed sensing system is highly integrated, making use of a common optical source/receiver block and exploiting the advantages of both (distributed and point) sensing technologies simultaneously. A multimode fiber is used for distributed temperature sensing, and a pair of FBGs in each discrete sensing point, partially overlapped in the spectral domain, allows for temperature-independent discrete strain measurements. Experimental results report a dynamic strain resolution of 7.8 / Hz within a full range of 1700 με and a distributed temperature resolution of 1°C at 20 km distance with 2.7 m spatial resolution.

© 2012 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(190.5650) Nonlinear optics : Raman effect
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Nonlinear Optics

Original Manuscript: July 13, 2012
Revised Manuscript: September 6, 2012
Manuscript Accepted: September 13, 2012
Published: October 16, 2012

Farhan Zaidi, Tiziano Nannipieri, Marcelo A. Soto, Alessandro Signorini, Gabriele Bolognini, and Fabrizio Di Pasquale, "Integrated hybrid Raman/fiber Bragg grating interrogation scheme for distributed temperature and point dynamic strain measurements," Appl. Opt. 51, 7268-7275 (2012)

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