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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 7 — Mar. 1, 2008
  • pp: 925–932

High-resolution interrogation technique for fiber optic extrinsic Fabry–Perot interferometric sensors by the peak-to-peak method

Yi Jiang  »View Author Affiliations

Applied Optics, Vol. 47, Issue 7, pp. 925-932 (2008)

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An improved peak-to-peak method is developed for interrogating the absolute cavity length of fiber optic extrinsic Fabry–Perot interferometric (EFPI) sensors with high resolution. A fiber Fabry–Perot tunable filter (FFP-TF) is used to scan the optical spectrum of an EFPI, and the problems caused by the nonlinear performance and poor repeatability of the FFP-TF are removed by using a wavelength calibration technique. A linear fitting is used to calculate the wavelength spacing between two adjacent apexes in the optical spectrum, and the cavity length can be retrieved using this wavelength spacing. The experimental results show that the measuring resolution is improved from 25 to 1 μm , and a linear output is also obtained.

© 2008 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 23, 2007
Revised Manuscript: December 25, 2007
Manuscript Accepted: January 9, 2008
Published: February 28, 2008

Yi Jiang, "High-resolution interrogation technique for fiber optic extrinsic Fabry-Perot interferometric sensors by the peak-to-peak method," Appl. Opt. 47, 925-932 (2008)

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