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

Minho Song, Shizhuo Yin, Paul B. Ruffin

Research output: Contribution to journalArticlepeer-review

134 Scopus citations

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/Hz in quasi-static and dynamic strain measurements, respectively.

Original languageEnglish (US)
Pages (from-to)1106-1111
Number of pages6
JournalApplied optics
Volume39
Issue number7
DOIs
StatePublished - Mar 1 2000

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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