Linking Distributed and Integrated Fiber-Optic Sensing
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Date
2022-08-28
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Journal Article
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yes
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Abstract
Distributed Acoustic Sensing (DAS) has become a popular method of observing seismic wavefields: backscattered pulses of light reveal strains or strain rates at any location 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). These integrated systems can be deployed over significantly longer distances, may be used in conjunction with live telecommunications, and can be significantly cheaper. However, they provide only a single time series representing strain over the entire length of the fiber. This work discusses theoretically how a distributed and integrated system can be quantitatively compared, and we note that the sensitivity depends strongly on points of curvature. Importantly, this work presents the first results of a quantitative, head-to-head comparison of a DAS and the integrated MFFI system using pre-existing telecommunications fibers in Athens, Greece.
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49 (16)
Pages / Article No.
Publisher
American Geophysical Union
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Organisational unit
03971 - Fichtner, Andreas / Fichtner, Andreas
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Funding
821115 - Real-time Earthquake Risk Reduction for Europe (EC)