Fiber-Optic Vibration Sensor Based on Beat Frequency and Frequency-Modulation Demodulation Techniques
Authors:
- 25 October 2010
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 23 (1) , 18-20
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
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