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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 14 — Jul. 9, 2007
  • pp: 8719–8730

In-line short cavity Fabry-Perot strain sensor for quasi distributed measurement utilizing standard OTDR

Edvard Cibula and Denis Donlagic  »View Author Affiliations

Optics Express, Vol. 15, Issue 14, pp. 8719-8730 (2007)

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This paper presents an in-line, short cavity Fabry-Perot fiber optic strain sensor. A short air cavity inside a single-mode fiber is created by the fusion splicing of appropriately micro machined fiber tips. A precise tuning of the cavity length is introduced and used for the setting of the sensor static characteristics within the quasi-linear range around a quadrature point, which significantly simplifies signal processing. Sensor insertion losses achieved by short cavity design and optimized fusion splicing proved to be below 1 dB. Low insertion loss allows for effective cascading of the proposed strain sensors into a quasi-distributed sensor array. A practical 10-point quasi-distributed strain sensor array was demonstrated in practice, where each in-line sensor was tuned to the same operating point in the static characteristics, thus allowing for simple interrogation of the sensor array by using standard telecommunication OTDR. In addition, precise tuning of the short cavity Fabry Perot sensor was applied for an effective compensation of temperature-induced strain errors and for an increase in the unambiguous measuring range, while improving the overall linearity of the sensor system.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 10, 2007
Revised Manuscript: June 17, 2007
Manuscript Accepted: June 18, 2007
Published: June 27, 2007

Edvard Cibula and Denis Donlagic, "In-line short cavity Fabry-Perot strain sensor for quasi distributed measurement utilizing standard OTDR," Opt. Express 15, 8719-8730 (2007)

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