Detection and Location of Damages by the Embedded Smart Piezo-Sensor Array

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  • YOON Dong-Jin
    KRISS (Korea Research Institute of Standards and Science)1 Doryong-Dong, Yuseong-Gu, Daejeon, Korea.
  • LEE Sang-Il
    KRISS (Korea Research Institute of Standards and Science)1 Doryong-Dong, Yuseong-Gu, Daejeon, Korea.
  • KWON Jae-Hwa
    KRISS (Korea Research Institute of Standards and Science)1 Doryong-Dong, Yuseong-Gu, Daejeon, Korea.
  • LEE Young-Sup
    KRISS (Korea Research Institute of Standards and Science)1 Doryong-Dong, Yuseong-Gu, Daejeon, Korea.

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Abstract

This study was focused at investigating the characteristics of a new smart-piezo-sensor for assessing the integrity of structures. We prepared two types of smart piezo-sensor layers such as a linear strip and planar sheet to investigate the characteristics of signal propagation in the sensor layer as well as the overall performance of each sensor. These smart-piezo-array-sensors, called Smart Active Layer (SAL), were fabricated by using a piezoelectric element and protection polymer layer. The performance of this sensor system was verified by simulating the wave propagation through several test conditions such as a patched layer on the thin plate, embedded layer between reinforcing FRP sheet and the surface of concrete beam, and an embedded layer into the model aircraft wing. When the cracks existed between the sensors and AE sources, the amplitude of propagated waveforms showed an additional decrease as expected. It can explain that a crack interferes with the progress of the wave produced by pulse-input event. Also, the known distance between each sensor element on the SAL allowed the sensors to detect the location of defects automatically. From the laboratory experimental study, we confirmed that the characteristics of wave propagation of the patch/embedding type smart-piezo-sensor affected an overall performance in detecting an elastic wave.

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