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Distributed optical fiber vibration sensor using generalized cross-correlation algorithm
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DOI：10.1016/j.measurement.2019.04.092.png)
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Abstract
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An optical fiber sensing sensor based on modified generalized cross-correlation algorithm is proposed, which could be used for distributed vibration detection. This sensor consists of double Sagnac interferometers connected by sensing fiber, which has a higher accuracy with the help of digital filtering and a simpler calculation because of conjugate multiplication. The impact, narrowband and broadband vibrations could be located, by means of the extraction of time delay between output signals. In this system, the positioning error on the sensing fiber of 5 km in length is stable less than 100 m. (C) 2019 Elsevier Ltd. All rights reserved.
Keywords:
Optical fiber vibration sensor
Double Sagnac interferometer
Time delay estimation
Generalized cross-correlation algorithm
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