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Sensors 2014, 14(9), 16109-16116; https://doi.org/10.3390/s140916109

A Fiber Bragg Grating Sensor Interrogation System Based on a Linearly Wavelength-Swept Thermo-Optic Laser Chip

1
Department of Cogno-Mechatronics Engineering, World Class University Program, Pusan National University, Busan, 609-735, Korea
2
Department of Production Engineering Research Institute, LG Electronics, Pyeongtaek-si, 451-713, Korea
3
Department of Biomedical Engineering, University of California Irvine, CA 92612, USA
*
Author to whom correspondence should be addressed.
Received: 1 July 2014 / Revised: 29 July 2014 / Accepted: 19 August 2014 / Published: 29 August 2014
(This article belongs to the Section Physical Sensors)
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Abstract

A linearized wavelength-swept thermo-optic laser chip was applied to demonstrate a fiber Bragg grating (FBG) sensor interrogation system. A broad tuning range of 11.8 nm was periodically obtained from the laser chip for a sweep rate of 16 Hz. To measure the linear time response of the reflection signal from the FBG sensor, a programmed driving signal was directly applied to the wavelength-swept laser chip. The linear wavelength response of the applied strain was clearly extracted with an R-squared value of 0.99994. To test the feasibility of the system for dynamic measurements, the dynamic strain was successfully interrogated with a repetition rate of 0.2 Hz by using this FBG sensor interrogation system. View Full-Text
Keywords: thermo-optic effect; swept source; fiber Bragg grating; strain sensor thermo-optic effect; swept source; fiber Bragg grating; strain sensor
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Lee, H.-S.; Lee, H.D.; Kim, H.J.; Cho, J.D.; Jeong, M.Y.; Kim, C.-S. A Fiber Bragg Grating Sensor Interrogation System Based on a Linearly Wavelength-Swept Thermo-Optic Laser Chip. Sensors 2014, 14, 16109-16116.

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