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http://dx.doi.org/10.3807/HKH.2008.19.1.068

Wavelength Interrogation Technique for Bragg Reflecting Strain Sensors Based on Arrayed Waveguide Grating  

Seo, Jun-Kyu (Nano-Bio Photonics Lab., Department of Electronics Engineering, Pusan National University)
Kim, Kyung-Jo (Nano-Bio Photonics Lab., Department of Electronics Engineering, Pusan National University)
Oh, Min-Cheol (Nano-Bio Photonics Lab., Department of Electronics Engineering, Pusan National University)
Lee, Sang-Min (Ship Welding Strength Lab, Naval Architecture and Ocean Engineering Dept, Pusan National University)
Kim, Young-Jae (Ship Welding Strength Lab, Naval Architecture and Ocean Engineering Dept, Pusan National University)
Kim, Myung-Hyun (Ship Welding Strength Lab, Naval Architecture and Ocean Engineering Dept, Pusan National University)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.1, 2008 , pp. 68-72 More about this Journal
Abstract
Fiber-optic strain sensors based on Bragg reflection gratings produce the change of reflection spectrum when an external stress is applied on the sensor. To measure the Bragg reflection wavelength in high speed, an arrayed waveguide grating device is incorporated in this work. By monitoring the output power from each channel of the AWG, the peak wavelength corresponding to the applied strain could be obtained. To enhance the accuracy of the AWG wavelength interrogation system, a chirped fiber Bragg grating with a 3-dB bandwith of 5.4 nm is utilized. The high-speed response of the proposed system is demonstrated by measuring a fast varying strain produced by the damped oscillation of a cantilever. An oscillation frequency of 17.8 Hz and a damping time constant of 0.96 second are obtained in this measurement.
Keywords
Optical strain sensor; Fiber Bragg grating (FBG); Arrayed waveguide grating (AWG); Chirped fiber grating; Wavelength interrogation;
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