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Smart Structures and Systems
  Volume 6, Number 5, July-August 2010, pages 749-765

A wireless guided wave excitation technique based on laser and optoelectronics
Hyun-Jun Park, Hoon Sohn, Chung-Bang Yun, Joseph Chung and Il-Bum Kwon

    There are on-going efforts to utilize guided waves for structural damage detection. Active sensing devices such as lead zirconate titanate (PZT) have been widely used for guided wave generation and sensing. In addition, there has been increasing interest in adopting wireless sensing to structural health monitoring (SHM) applications. One of major challenges in wireless SHM is to secure power necessary to operate the wireless sensors. However, because active sensing devices demand relatively high electric power compared to conventional passive sensors such as accelerometers and strain gauges, existing battery technologies may not be suitable for long-term operation of the active sensing devices. To tackle this problem, a new wireless power transmission paradigm has been developed in this study. The proposed technique wirelessly transmits power necessary for PZT-based guided wave generation using laser and optoelectronic devices. First, a desired waveform is generated and the intensity of the laser source is modulated accordingly using an electro-optic modulator (EOM). Next, the modulated laser is wirelessly transmitted to a photodiode connected to a PZT. Then, the photodiode converts the transmitted light into an electric signal and excites the PZT to generate guided waves on the structure where the PZT is attached to. Finally, the corresponding response from the sensing PZT is measured. The feasibility of the proposed method for wireless guided wave generation has been experimentally demonstrated.
Key Words
    wireless power transmission; laser; optoelectronics; active sensing; guided wave generation.
Hyun-Jun Park, Hoon Sohn and Chung-Bang Yun; Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejeon, Korea
Joseph Chung; Senior Manager, R&D Department, CyTroniq. Co. Ltd., Hoseo University, Sechul-ri, Baebang-myun, Asan, Korea
Il-Bum Kwon; Center for Safety Measurement, Korea Research Institute of Standards and Science, Doryong-dong, Yuseong-gu, Daejeon, Korea

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