Wireless guided wave and impedance measurement using laser and piezoelectric transducers

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Guided-wave-and impedance-based structural health monitoring (SHM) techniques have gained much attention due to their high sensitivity to small defects. One of the popular devices commonly used for guided wave and impedance measurements is a lead zirconate titanate (PZT) transducer. This study proposes a new wireless scheme where the power and data required for PZT excitation and sensing are transmitted via laser. First, a modulated laser beam is wirelessly transmitted to the photodiode connected to a PZT on a structure. Then, the photodiode converts the laser light into an electric signal, and it is applied to the PZT for excitation. The corresponding responses, impedance at the same PZT or guided waves at another PZT, are measured, re-converted into laser light, and wirelessly transmitted back to the other photodiode located in the data interrogator for signal processing. The feasibility of the proposed wireless guided wave and impedance measurement schemes has been examined through circuit analyses and experimentally investigated in a laboratory setup.
Publisher
IOP PUBLISHING LTD
Issue Date
2012-03
Language
English
Article Type
Article
Citation

SMART MATERIALS AND STRUCTURES, v.21, no.3

ISSN
0964-1726
DOI
10.1088/0964-1726/21/3/035029
URI
http://hdl.handle.net/10203/98727
Appears in Collection
CE-Journal Papers(저널논문)
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