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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 7 — Mar. 1, 2000
  • pp: 1106–1111

Fiber Bragg grating strain sensor demodulation with quadrature sampling of a Mach–Zehnder interferometer

Minho Song, Shizhuo Yin, and Paul B. Ruffin  »View Author Affiliations


Applied Optics, Vol. 39, Issue 7, pp. 1106-1111 (2000)
http://dx.doi.org/10.1364/AO.39.001106


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Abstract

A simple and highly sensitive phase-demodulation technique is proposed, and its use for a fiber Bragg grating strain sensor is experimentally demonstrated. Sampling a phase-modulated Mach–Zehnder output with controlled time delay produced two quadrature data streams that have relative quadrature phase difference (90°). The Bragg wavelength-dependent phase information is extracted by application of digital arctangent function and phase unwrapping to the quadrature signals. By use of this technique with a reference grating, strain sensing at as much as a 30-kHz sampling rate was obtained with strain resolution of 3.5 microstrains and 6 nanostrains/ Hzin quasi-static and dynamic strain measurements, respectively.

© 2000 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.5060) Instrumentation, measurement, and metrology : Phase modulation

History
Original Manuscript: June 24, 1999
Revised Manuscript: November 29, 1999
Published: March 1, 2000

Citation
Minho Song, Shizhuo Yin, and Paul B. Ruffin, "Fiber Bragg grating strain sensor demodulation with quadrature sampling of a Mach–Zehnder interferometer," Appl. Opt. 39, 1106-1111 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-7-1106

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