Laser based impedance measurement for pipe corrosion and bolt-loosening detection

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This study proposes a laser based impedance measurement system and impedance based pipe corrosion and bolt-loosening monitoring techniques under temperature variations. For impedance measurement, the laser based impedance measurement system is optimized and adopted in this paper. First, a modulated laser beam is radiated to a photodiode, converting the laser beam into an electric signal. Then, the electric signal is applied to a MFC transducer attached on a target structure for ultrasonic excitation. The corresponding impedance signals are measured, re-converted into a laser beam, and radiated back to the other photodiode located in a data interrogator. The transmitted impedance signals are treated with an outlier analysis using generalized extreme value (GEV) statistics to reliably signal off structural damage. Validation of the proposed technique is carried out to detect corrosion and bolt-loosening in lab-scale carbon steel elbow pipes under varying temperatures. It has been demonstrated that the proposed technique has a potential to be used for structural health monitoring (SHM) of pipe structures.
Publisher
TECHNO-PRESS
Issue Date
2015-01
Language
English
Article Type
Article
Citation

SMART STRUCTURES AND SYSTEMS, v.15, no.1, pp.41 - 55

ISSN
1738-1584
URI
http://hdl.handle.net/10203/195563
Appears in Collection
CE-Journal Papers(저널논문)
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