Title :
Multi-longitudinal mode fiber-optic vibration sensor
Author :
Gao, Liang ; Liu, Shengchun ; Yin, Zuowei ; Chen, Lin ; Chen, Xiangfei
Author_Institution :
Nanjing Nat. Lab. of Microstructures, Nanjing Univ., Nanjing, China
Abstract :
A novel multi-longitudinal mode fiber-optic vibration sensor is presented in this paper. It is made of a piece of fiber, a fiber Bragg grating and a coupler. The beat frequency of any two different laser modes is modulated by the vibration signal. The modulated beat frequency signal is frequency-modulated signal, thus it can be demodulated with the simple frequency-modulation technique. It is demonstrated that the vibration signal from 60 Hz to 20 KHz can be measured successfully. The sensor has high signal-to-noise ratio, especially between 500 Hz and 10 KHz.
Keywords :
Bragg gratings; fibre optic sensors; lasers; optical modulation; vibration measurement; coupler; fiber Bragg grating; frequency 500 Hz to 10 kHz; frequency 60 Hz to 20 kHz; laser mode; modulated beat frequency-modulated signal; multilongitudinal mode fiber-optic vibration sensor; signal-to-noise ratio; vibration signal; Demodulation; Frequency modulation; Optical fiber couplers; Optical fiber sensors; Vibration measurement; Vibrations; Fiber-optic vibration sensor; beat frequency; frequency-modulation demodulation; multi-longitudinal mode;
Conference_Titel :
Microwave Photonics, 2011 International Topical Meeting on & Microwave Photonics Conference, 2011 Asia-Pacific, MWP/APMP
Conference_Location :
Singapore
Print_ISBN :
978-1-61284-716-0
DOI :
10.1109/MWP.2011.6088687
