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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 28 — Oct. 1, 2007
  • pp: 6879–6884

Vernier-effect optical interrogation technique for fiber Bragg grating sensors

Gregory B. Tait  »View Author Affiliations

Applied Optics, Vol. 46, Issue 28, pp. 6879-6884 (2007)

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This work demonstrates a new technique for real-time optical sensor interrogation by exploiting a novel Vernier effect between the multiple (comb) wavelength responses of a multiplexed fiber Bragg grating array and the fixed discrete wavelengths of an all-solid-state tunable laser. Sets of output photodetector voltages serve as high-resolution optical “signatures” to determine uniquely the strain in the single fiber section. The sensor demonstrated here is compact, lightweight, and is specifically intended for remote operability in harsh (vibrational) environments. In this proof of concept, strain values over a range of nearly 500 μ ε can be easily resolved to better than 5.9 μ ε , which is the incremental limit of the mechanical test fixture used to induce strain in the experiment.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(230.1480) Optical devices : Bragg reflectors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: April 18, 2007
Revised Manuscript: July 5, 2007
Manuscript Accepted: July 31, 2007
Published: September 21, 2007

Gregory B. Tait, "Vernier-effect optical interrogation technique for fiber Bragg grating sensors," Appl. Opt. 46, 6879-6884 (2007)

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