Title :
Fiber-Optic Vibration Sensor Based on Beat Frequency and Frequency-Modulation Demodulation Techniques
Author :
Gao, Liang ; Liu, Shengchun ; Yin, Zuowei ; Zhang, Liang ; Chen, Lin ; Chen, Xiangfei
Author_Institution :
Nanjing Nat. Lab. of Microstructures, Nanjing Univ., Nanjing, China
Abstract :
In this letter, a novel multilongitudinal mode fiber-optic vibration sensor is presented. The beat frequency of any two different laser modes is modulated by the vibration signal. The modulated beat frequency signal can be demodulated by a frequency-modulation demodulator. It is demonstrated that the vibration from 60 Hz to 20 KHz can be measured successfully. The sensor has high sensitivity and high signal-to-noise ratio, especially between 500 Hz and 7.4 KHz.
Keywords :
fibre optic sensors; frequency modulation; optical modulation; vibration measurement; beat frequency; fiber optic vibration sensor; frequency 60 Hz to 20 kHz; frequency-modulation demodulation; laser modes; signal-to-noise ratio; Demodulation; Frequency modulation; Optical fiber couplers; Optical fiber sensors; Vibration measurement; Vibrations; Beat frequency; fiber-optic vibration sensor; frequency-modulation demodulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2089612
