Title :
Linearized Wavelength Interrogation System of Fiber Bragg Grating Strain Sensor Based on Wavelength-Swept Active Mode Locking Fiber Laser
Author :
Hwi Don Lee ; Gyeong Hun Kim ; Tae Joong Eom ; Myung Yung Jeong ; Chang-Seok Kim
Author_Institution :
Dept. of Cogno-Mechatron. Eng, Pusan Nat. Univ., Busan, South Korea
Abstract :
We demonstrated a linearized wavelength interrogation system of fiber Bragg grating (FBG) strain sensors, based on a wavelength-swept active mode locking (AML) fiber laser. Since the wavelength sweeping mechanism of the AML fiber laser does not depend on the wavelength selecting filter, we can easily demonstrate the wavelength-linear sweeping by applying a programmable electrical signal to the laser cavity. Both static and dynamic strain measurements of FBG sensors were characterized with high linearity, which has an R-square value of 0.9999 at a sweep rate of 50 kHz.
Keywords :
Bragg gratings; fibre lasers; fibre optic sensors; laser mode locking; strain measurement; strain sensors; AML fiber laser; FBG sensor; R-square value; dynamic strain measurement; fiber Bragg grating strain sensor; frequency 50 kHz; laser cavity; linearized wavelength interrogation system; programmable electrical signal; static strain measurement; sweep rate; wavelength selecting filter; wavelength sweeping mechanism; wavelength-linear sweeping; wavelength-swept active mode locking fiber laser; Fiber gratings; Fiber lasers; Measurement by laser beam; Optical fiber sensors; Strain; Wavelength measurement; Fiber Bragg grating; Fiber lasers; Laser mode locking; Strain sensors; fiber lasers; laser mode locking; strain sensors;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2368148
