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20 May 2009 Novel FBG vibration sensor based on matching filter demodulation
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A novel fiber Bragg grating (FBG) vibration sensor is designed based on optical fiber sensing technology. The principle of vibration detection using optical fiber Bragg grating is analyzed. At the same time, both the theories of matching grating demodulation technology and optical fiber grating tuning technology based on constant strength cantilever are adopted. As a result, the sensitivity of sensor and the stability of the detecting signal are all improved by employing additionally electromagnetic damping. Good results are obtained from vibration detecting experiments using vibrator standard signal, then Fourier analysis is applied. Frequency detection ability of the vibration sensor is favorable. The frequency detection precision is ± 0.5 Hz, and frequency measuring scope is up to 200 Hz. In addition, the detecting signal has high signal to noise ratio. From shock vibration experiment, it can be seen that free vibration frequency of the sensor is about 250 Hz. Above all, the vibration sensor has extensive application prospects in practical engineering.
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Jing Wang, Qingmei Sui, Dejun Feng, and Mingshun Jiang "Novel FBG vibration sensor based on matching filter demodulation", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 728325 (20 May 2009);

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