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Smart Structures and Systems
  Volume 11, Number 2, February 2013, pages 185-197

Simultaneous active strain and ultrasonic measurement using fiber acoustic wave piezoelectric transducers
J.R. Lee, C.Y. Park and C.W. Kong

    We developed a simultaneous strain measurement and damage detection technique using a pair of surface-mounted piezoelectric transducers and a fiber connecting them. This is a novel sensor configuration of the fiber acoustic wave (FAW) piezoelectric transducer. In this study, lead-zirconate-titanate (PZT) transducers are installed conventionally on a plate\'s surface, which is a technique used in many structural health monitoring studies. However, our PZTs are also connected with an optical fiber. A FAW and Lamb wave are simultaneously guided in the optical fiber and the structure, respectively. The dependency of the time-of-flight of the FAW on the applied strain is quantified for strain sensing. In our experimental results, the FAW exhibited excellent linear behavior and no hysteresis with respect to the change in strain. On the other hand, the well-known damage detection function of the surface-mounted PZT transducers was still available by monitoring the waveform change in the conventional Lamb wave ultrasonic path.
Key Words
    fiber acoustic wave; lamb wave; strain measurement; ultrasonic measurement; structural health monitoring
J.R. Lee : 1Department of Aerospace Engineering and LANL-CBNU Engineering Institute Korea, Chonbuk National
University, Jeonju, South Korea
C.Y. Park : Aeronautical Technology Directorate, Agency for Defense Development, Daejeon 305-600, South Korea
C.W. Kong : Structures and Materials Department, Korea Aerospace Research Institute, Daejeon, South Korea

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