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Journal of Sensors
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2019
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Article
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Fig 9
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Research Article
Health Monitoring of Bolt Looseness in Timber Structures Using PZT-Enabled Time-Reversal Method
Figure 9
Two signals in the time-reversal method at 50 N·m.
(a)
The reversed signal in 50 N·m
(b)
The focused signal in 50 N·m