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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 25 — Dec. 8, 2008
  • pp: 20666–20675

Location of a time-varying disturbance using an array of identical fiber-optic interferometers interrogated by CW DFB laser

Rodolfo Martínez Manuel, M. G. Shlyagin, and S. V. Miridonov  »View Author Affiliations

Optics Express, Vol. 16, Issue 25, pp. 20666-20675 (2008)

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A novel technique for distributed detection and localization of vibrational disturbances is presented. It is based on a serial array of identical low-finesse Fabry-Perot interferometers interrogated at a fixed wavelength by DFB diode laser intensity modulated at 10 KHz. Interferometers are formed directly in the single mode SMF-28 fiber by pairs of fiber Bragg gratings with reflectivity <0.05% each. A simple signal processing based on the Fourier transform of detected signals and evaluation of phases for different signal components enables localization of a perturbed interferometer with a high accuracy. In experiment, a localization accuracy of 10 meters has been demonstrated for 5 km long fiber after 1 s of averaging. The system has the capability of using well in excess of 100 interferometers in a single fiber channel. A simple sensor configuration and the use of low-frequency components make it potentially inexpensive and suitable for applications where a continuous monitoring of long structures has to be performed for appearance of vibrations.

© 2008 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 29, 2008
Revised Manuscript: October 4, 2008
Manuscript Accepted: October 6, 2008
Published: December 1, 2008

Rodolfo Martinez Manuel, M. G. Shlyagin, and S. V. Miridonov, "Location of a time-varying disturbance using an array of identical fiber-optic interferometers interrogated by CW DFB laser," Opt. Express 16, 20666-20675 (2008)

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