Smart Structures and Systems

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

  • Yang, Jinyeol (Department of Civil Engineering, Korea Advanced Institute for Science and Technology) ;
  • Liu, Peipei (Department of Civil Engineering, Korea Advanced Institute for Science and Technology) ;
  • Yang, Suyoung (Department of Civil Engineering, Korea Advanced Institute for Science and Technology) ;
  • Lee, Hyeonseok (Department of Civil Engineering, Korea Advanced Institute for Science and Technology) ;
  • Sohn, Hoon (Department of Civil Engineering, Korea Advanced Institute for Science and Technology)
  • Received : 2013.11.20
  • Accepted : 2014.01.17
  • Published : 2015.01.25
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Abstract

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.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF), KAIST

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