期刊
OPTICS EXPRESS
卷 27, 期 5, 页码 7319-7329出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.27.007319
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- U.S. Department of Energy Office of Science [DE-AC05-00OR22725]
We demonstrate a quadrature phase-shifted optical demodulation scheme for low-coherence fiber-optic Fabry-Perot interferometric sensors. The main part of the demodulator is a fiber-optic Mach-Zehnder interferometer (MZI) constructed with a 1 x 2 fiber coupler, a 3 x 3 fiber coupler, and fiber delay lines. This configuration allows us to generate quadrature phase-shifted interference signals simultaneously, thus eliminating the problem of ambiguous phase discrimination. The path length difference of the MZI is adjustable to adapt to sensors with arbitrary gaps. A great phase stability of the MZI has been obtained by using identical optical components in its two optical paths. The demodulator has been applied to a fiber-optic vibrometer. Measurement of vibrations with amplitudes from 0.67 nm to 12.3 mu m has been demonstrated. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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