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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 3 — Feb. 10, 2014
  • pp: 2299–2308

OFDR with double interrogation for dynamic quasi-distributed sensing

Adva Bar Am, Dror Arbel, and Avishay Eyal  »View Author Affiliations


Optics Express, Vol. 22, Issue 3, pp. 2299-2308 (2014)
http://dx.doi.org/10.1364/OE.22.002299


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Abstract

A method for phase sensitive quasi-distributed vibration and acoustical sensing is presented. The method is based on double optical frequency domain reflectometry interrogation of a sensing fiber with an array of discrete weak reflectors. Two replicas of the interrogation signal are launched into the sensing fiber. The time delay between the replicas is equal to the roundtrip time between two consecutive reflectors. Each peak in the spectrum of the returning signal is made from a coherent addition of the reflections of two consecutive reflectors. Its magnitude is highly sensitive to the optical phase in the fiber segment between the reflectors. The system was used to detect and locate the fall of a paperclip from height of 40cm onto a sandbox where a 15cm segment of the fiber was buried. In a different experiment the system successfully detected and located minute vibrations at 440Hz that were induced by touching the fiber with a tuning fork.

© 2014 Optical Society of America

OCIS Codes
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2630) Fiber optics and optical communications : Frequency modulation
(060.4230) Fiber optics and optical communications : Multiplexing
(120.1840) Instrumentation, measurement, and metrology : Densitometers, reflectometers
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Sensors

History
Original Manuscript: October 16, 2013
Revised Manuscript: December 5, 2013
Manuscript Accepted: December 7, 2013
Published: January 28, 2014

Citation
Adva Bar Am, Dror Arbel, and Avishay Eyal, "OFDR with double interrogation for dynamic quasi-distributed sensing," Opt. Express 22, 2299-2308 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-3-2299


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