Title :
A demodulation method of FBG based on DFB laser and PID algorithm
Author :
Liu, Jie ; Zhao, Hong ; Wang, Peng ; Jiang, Liang ; Huang, Chao
Author_Institution :
Coll. of Electr. & Electron. Eng., Harbin Univ. of Sci. & Technol., Harbin, China
Abstract :
A demodulation system for fiber Bragg grating (FBG) is designed based on distributed feedback (DFB) laser. By use of adjusting the internal temperature, wavelength tunable laser is achieved, and utilizing the laser and PID algorithm to realize the demodulation of FBG sensing signal. The system uses all-fiber structure, with fast response and high precision demodulation. Experimental results show that the method is accurate and stable to realize the demodulation of FBG sensing signal, the system minimum resolution can achieve 0.4 pm, dynamic range was up to 3 nm.
Keywords :
Bragg gratings; demodulation; distributed feedback lasers; fibre optic sensors; laser tuning; optical design techniques; three-term control; DFB laser; FBG sensing; PID algorithm; all-fiber structure; demodulation method; distributed feedback laser; fiber Bragg grating; wavelength tunable laser; Demodulation; Distributed feedback devices; Fiber gratings; Laser feedback; Voltage control; DFB laser; Dynamic strain; PID algorithm; demodulation; fiber Bragg grating;
Conference_Titel :
Optoelectronics and Microelectronics Technology (AISOMT), 2011 Academic International Symposium on
Conference_Location :
Harbin
Print_ISBN :
978-1-4577-0794-0
DOI :
10.1109/AISMOT.2011.6159358
