Title :
A novel FBG laser sensor based on beat frequency modulation technology
Author :
Zhang, Liang ; Liu, Shengchun ; Yin, Zuowei ; Gao, Liang ; Chen, Xiangfei
Author_Institution :
The National Laboratory of Microstructure, Nanjing University, 210093, China
Abstract :
We propose and experimentally demonstrate a novel FBG dual-wavelength fiber laser sensor based on the beat frequency demodulation technology. The dual-wavelength beat frequency sensing signal of about 5.224 GHz has been obtained in a photodetector and observed by a radio-frequency spectrum analyzer (RFSA). Furthermore, by employing a LiNbO3 modulator, the high-frequency beating signal can be tuned arbitrarily to tens or hundreds of MHz without distortions. Thus a very cheap and low-frequency RF spectrum analyzer can be used in frequency signal detection. When a strain is applied on the sensor, the beating signal will shift with a stain sensitivity of about (−3.92) kHz/µε
Keywords :
Demodulation; Distortion; Fiber lasers; Frequency modulation; Laser tuning; Optical fiber sensors; Photodetectors; RF signals; Radio frequency; Spectral analysis; FBG dual-wavelength fiber laser; beat frequency; modulator; strain sensor;
Conference_Titel :
Communications and Photonics Conference and Exhibition (ACP), 2009 Asia
Conference_Location :
Shanghai, China
Print_ISBN :
978-1-55752-877-3
Electronic_ISBN :
978-1-55752-877-3
