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

Sensors

Hyung-Seok Lee¹  Hwi Don Lee¹  Hyo Jin Kim²  Jae Du Cho³  Myung Yung Jeong¹ 

[1] Department of Cogno-Mechatronics Engineering, World Class University Program, Pusan National University, Busan, 609-735, Korea; E-Mails:;Department of Production Engineering Research Institute, LG Electronics, Pyeongtaek-si, 451-713, Korea; E-Mail:;Department of Biomedical Engineering, University of California Irvine, CA 92612, USA; E-Mail:

关键词: thermo-optic effect;    swept source;    fiber Bragg grating;    strain sensor;   

DOI  :  10.3390/s140916109

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.