Abstract
Vibration monitoring characteristic of fiber Bragg grating (FBG) sensor and resistance strain gauge sensor were investigated. FBG sensor and resistance strain gauge sensor were fixed on a uniform strength beam. The advantage and disadvantage of two kinds of sensors were compared. Vibration was caused by a motor which was fixed at the end of uniform strength beam. The vibration signal in time domain was measured by FBG sensor and resistance strain gauge sensor simultaneously. And the frequency spectrum of the vibration signal was acquired through Fast Fourier Transform (FFT). The results show that, the vibration graph in time domain monitored by FBG sensor is consistent with the vibration graph monitored by resistance strain gauge sensor. The frequency spectrum of FBG sensor displays second harmonic and third harmonic obviously, except fundamental frequency. But the frequency spectrum of resistance strain gauge sensor displays no higher harmonic. It is also indicated that, under the electromagnetic interference conditions, the vibration signal can not be monitored by resistance strain gauge, but can be monitored by FBG sensor.
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