https://doi.org/10.1140/epjp/s13360-024-05809-5
Regular Article
Fiber-optic extrinsic Fabry–Perot interferometer sensors with quadrature phase three wavelength demodulation
1
Xinjiang Institute of Engineering, 830091, Ürümqi, China
2
College of Physics and Electronic Science, Shanxi Datong University, 037009, Datong, China
a
2692709482@qq.com
b
dongjiyu2814@163.com
Received:
10
August
2024
Accepted:
6
November
2024
Published online:
19
November
2024
In this paper, a quadrature phase three-wavelength demodulation method for interrogating fiber-optic extrinsic Fabry–Perot interferometric sensors and dynamic signals is proposed. Three interference signals are obtained by selecting three sets of specific wavelength laser sources, two of which are symmetrical with the third signal. The linear fitting method is used to eliminate the direct current (DC) components of the two sets of signals, and two new quadrature signals are obtained. The phase signal demodulation of these two calibrated quadrature signals is then performed by the arctan algorithm. Experimental results show that the proposed method can accurately demodulate dynamic signals with different frequencies and modulation depths at different sensor cavity lengths. It is also important to mention that the proposed demodulation method avoids the assumption that the DC component and the alternating current amplitude of the interference signal are equal, thus it has a wide range of applications in three-wavelength demodulation.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
