13 April 2011 Development of a non-contact PZT excitation and sensing technology via laser
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In recent years, guided wave based structural health monitoring (SHM) techniques have attracted much attention, because they are not only sensitive to small defects but also capable to cover a wide range in plate and pipe like structures. The guided waves in a structure can be generated and sensed by a variety of techniques. This study proposes a new wireless scheme for PZT excitation and sensing where power as well as data can be transmitted via laser. A generated waveform by modulation of a laser is wirelessly transmitted to a photodiode connected to a PZT on the structures. Then, the photodiode converts the light into an electrical signal and excite the PZT and the structure. Then, the reflected response signal received at the sensing PZT is re-converted into a laser, which is wirelessly transmitted back to another photodiode located in the data acquisition unit for damage diagnosis. The feasibility of the proposed power and data transmission scheme has been experimentally investigated in a laboratory setup. Using the proposed technology, a PZT transducer can be attached to a structure without complex electronic components and a power supply.
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Hyun-Jun Park, Hyun-Jun Park, Hoon Sohn, Hoon Sohn, Chung-Bang Yun, Chung-Bang Yun, Joseph Chung, Joseph Chung, Michael Lee, Michael Lee, } "Development of a non-contact PZT excitation and sensing technology via laser", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79811A (13 April 2011); doi: 10.1117/12.881927; https://doi.org/10.1117/12.881927

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