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 journalArticle

    111 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

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