30 March 2009 Characteristics of reflection-type optical fiber sensor system using one grating panel
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Abstract
Optical fibers can be used as a promising sensors in smart structures thanks to their novel characteristics. In particular, its immunity to electromagnetic interference (EMI) makes the sensor suitable for use in electronic environments. In order to inspect the reliability of a structure, it is essential to characterize the dynamic responses of the structure. An accelerometer associated with optical fiber makes it possible to conduct real-time structural health monitoring under high electromagnetic environments. This paper describes an optimal design of a novel fiber optic accelerometer using one grating panel for the application to civil engineering structures. The fiber optic sensor design was optimized to have the best sensitivity to the motion of the reflective grating using two optical fibers in the quadrature. The reflected optical signal of the sensor is influenced by the reflective grating pattern and optical fiber-grating distance. In this paper, several simulations and experiments were carried out to evaluate the characteristics of the output signals according to the grating pattern and the distance between the optical fiber and the grating for a fixed fiber core diameter. Through comparison of the results between the simulations and the experiments, the optimum design of the grating-pattern was determined to obtain a stable and periodic sine wave as the output signal. Furthermore, it was demonstrated that the output signals reflected by one grating panel could be used for the final parameter-measurement.
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Yeon-Gwan Lee, Yeon-Gwan Lee, Sang-Oh Park, Sang-Oh Park, Dae-Hyun Kim, Dae-Hyun Kim, Byeong-Wook Jang, Byeong-Wook Jang, Chun-Gon Kim, Chun-Gon Kim, } "Characteristics of reflection-type optical fiber sensor system using one grating panel", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72923H (30 March 2009); doi: 10.1117/12.817003; https://doi.org/10.1117/12.817003
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