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Conference Paper

Linking Distributed and Integrated Fiber-Optic Deformation Sensing

Authors

Fichtner,  Andreas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bogris,  Adonis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nikas,  Thomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bowden,  Daniel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lentas,  Konstantinos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Melis,  Nicos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Simos,  Christos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Simos,  Iraklis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Smolinski,  Krystyna
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Fichtner, A., Bogris, A., Nikas, T., Bowden, D., Lentas, K., Melis, N., Simos, C., Simos, I., Smolinski, K. (2023): Linking Distributed and Integrated Fiber-Optic Deformation Sensing, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1682


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017919
Abstract
Distributed Acoustic Sensing (DAS) has become a popular method of observing seismic wavefields: backscattered pulses of light reveal deformation with meter-scale resolution along a fiber-optic cable. In contrast, a few newer systems transmit light through a cable and collect integrated phase delays over the entire cable, such as the Microwave Frequency Fiber Interferometer (MFFI). The outstanding advantage of these integrated systems is that they can be interrogated over significantly longer distances of hundreds or thousands of kilometers, may be used at the same time as live telecommunication, and can be significantly cheaper. However, they provide only a single time series representing strain over the entire length of fiber. In the first part of this contribution, we present a theory for integrated fiber optic sensing. This enables a quantitative comparison of these new systems with established DAS measurements. Furthermore, we note that sensitivity to deformation depends critically on local fiber curvature, which offers opportunities to mimic distributed measurements with integrated systems. In the second part, we present the first results of a quantitative, head-to-head comparison of a DAS and the integrated MFFI system using pre-existing telecommunication fibers in Athens, Greece.