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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 14 — Jul. 6, 2009
  • pp: 11515–11529

Quasi-distributed long-gauge fiber optic sensor system

Matjaž Linec and Denis donlagić  »View Author Affiliations

Optics Express, Vol. 17, Issue 14, pp. 11515-11529 (2009)

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This paper presents a quasi-distributed, long-gauge, sensor system for measurement optical path length variation. This system can be directly applied to long gauge strain and/or temperature sensing. The proposed sensor system is comprised of sensing fiber, which is divided into the sensor’s segments separated by semi reflective mirrors made out of standard optical connectors. Short duration radio-frequency modulated optical bursts are launched into the sensing fiber and phase differences among individual reflected bursts are measured to determine the optical path-length variations among neighboring mirrors. Twenty sensing fiber segments were successfully addressed by a single-signal processor, while relying on standard telecommunication PIN diode, and a Fabry Perot laser diode. The resolution of a fiber-length variation better than 5 µm was demonstrated in practice. Since the long sections of fiber can be employed for constructing individual sensors within the sensor’s array, a microstrain resolution can be achieved in practice. The drift of the sensor’s system can be predominantly attributed to the temperature sensitivity of the electronic components, which proved to be below 20 µm/°C. The entire system relies on simple and widely-used components that are low-cost.

© 2009 OSA

OCIS Codes
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.4610) Instrumentation, measurement, and metrology : Optical fabrication
(230.0250) Optical devices : Optoelectronics
(250.4745) Optoelectronics : Optical processing devices
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 23, 2009
Revised Manuscript: June 15, 2009
Manuscript Accepted: June 15, 2009
Published: June 24, 2009

Matjaž Linec and Denis Đonlagić, "Quasi-distributed long-gauge fiber optic sensor system," Opt. Express 17, 11515-11529 (2009)

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