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Fibre Bragg Grating-based Acoustic Sensor Array for Improved Condition Monitoring of Marine Lifting Surfaces

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Figure

Fig. 1.   A typical FBG-based cascaded acoustic sensor system, coupled with a  PZT acoustic sensor, co-located with FBG1, for cross-comparison
Fig. 5.   Overall distribution of positions (dark dots) where the impact was applied during the tests
Fig. 8.   Acoustic signals acquired by the optical based acoustic sensors at all  four sensor locations of the half-rudder when rudder was subject to excitation of the sonotrode
Fig. 10.   Acoustic signals acquired by both FBG-based acoustic sensor and co- located conventional PZT sensor indicating similar time of arrival
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