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http://dx.doi.org/10.3807/HKH.2008.19.3.175

Acceleration Sensor Using Optical Fibers and Film Gratings  

Lee, Youn-Jea (Dept. of Applied Optics and Electromagnetics, Hannam University)
Jo, Jae-Heung (Dept. of Applied Optics and Electromagnetics, Hannam University)
Kwon, Il-Bum (Korea Research Institute of Standards and Science)
Seo, Dae-Cheol (Korea Research Institute of Standards and Science)
Lee, Nam-Kwon (Korea Research Institute of Standards and Science)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.3, 2008 , pp. 175-181 More about this Journal
Abstract
We develop a fiber optic acceleration sensor with LED, PD, POF, and a cantilever beam, having film grating at the edge of the beam. Light is transmitted from LED to PD through the film grating. When the cantilever beam moves by external vibration, output light is modulated as sinusoidal signals. The characteristics of output signals are dominated by the spacing of the film grating and also by the size and the elasticity of the beam. Two output signals, having constant initial phase difference, are obtained by two gratings with 90 degree phase difference. Those two signals are used to determine phase angle, which is proportional to the displacement of the beam. Finally, the acceleration is determined from conversion equation between displacement and acceleration. This sensor is designed for monitoring the vibration of large and complex building in the low frequency range of below 7 Hz, and is particularly suitable to measure acceleration in electromagnetic environments.
Keywords
Plastic optical fiber; Acceleration sensor; Cantilever beam; Film grating; Phase unwrapping;
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